Texas Instruments Professional related Interrupts.

MS-DOS-related Interrupts:

TI Professional BIOS Interrupts:


INT 21 - DOS 2.11+ - GET OR SET MEMORY ALLOCATION STRATEGY
	AH = 58h
	AL = subfunction
	    00h get allocation strategy
		Return: AX = current strategy (see #01679)
	    01h set allocation strategy
		BL = new allocation strategy (see #01679)
		BH = 00h (DOS 5+)
Return: CF clear if successful
	CF set on error
	    AX = error code (01h) (see #01680)
Notes:	the Set subfunction accepts any value in BL for DOS 3.x and 4.x;
	  2 or greater means last fit
	the Get subfunction returns the last value set
	setting an allocation strategy involving high memory does not
	  automatically link in the UMB memory chain; this must be done
	  explicitly with AX=5803h in order to actually allocate high memory
	a program which changes the allocation strategy should restore it
	  before terminating
	Toshiba MS-DOS v2.11 supports subfunctions 00h and 01h, as does the
	  TI Professional MS-DOS v2.13
	DR DOS 3.41 reportedly reverses subfunctions 00h and 01h
SeeAlso: AH=48h,AH=49h,AH=4Ah,INT 2F/AX=4310h"XMS",INT 67/AH=3Fh

(Table 01679)
Values for DOS memory allocation strategy:
 00h low memory first fit
 01h low memory best fit
 02h low memory last fit
 [DOS 5+ values snipped, not applicable to the TI Professional.]





INT 21 - DOS v2.11-2.13 - SET OEM INT 21 HANDLER
	AH = F8h
	DS:DX -> OEM INT 21 handler for functions F9h to FFh
		 FFFFh:FFFFh disables OEM handler
Notes:	this function is known to be supported by Toshiba T1000 ROM MS-DOS
	  v2.11, Sanyo MS-DOS v2.11, and TI Professional Computer DOS v2.13
	at least potentially this is still available with (OEM versions??? of)
	  MS-DOS 6.0.
	calls to AH=F9h through AH=FFH will return AL=00h if no handler set
	the user handler is called immediately on entry to the main DOS INT 21h
	  function dispatcher with interrupts disabled and all registers and
	  stack exactly as set by caller; it should exit with IRET
SeeAlso: AH=F9h"OEM"




INT 40 - TI Professional PC - IRQ0
Note:	on the TI Pro, IRQ0 is connected to the same pin on the expansion bus
	  that IBM connects to IRQ2
SeeAlso: INT 0A"IRQ2",INT 41"TI Professional"




INT 41 - TI Professional PC - IRQ1
Note:	on the TI Pro, IRQ1 is connected to the same pin on the expansion bus
	  that IBM connects to IRQ3
SeeAlso: INT 0B"IRQ3",INT 40"TI Professional",INT 42"TI Professional"




INT 42 - TI Professional PC - IRQ2
Note:	on the TI Pro, IRQ0 is connected to the same pin on the expansion bus
	  that IBM connects to IRQ4
SeeAlso: INT 0C"IRQ4",INT 41"TI Professional",INT 43"TI Professional"



INT 43 - TI Professional PC - IRQ3 - TIMER1 25ms INTERVAL INTERRUPT
SeeAlso: INT 0B"IRQ3",INT 42"TI Professional",INT 44"TI Professional"
SeeAlso: INT 58"TI Professional"




INT 44 - TI Professional PC - IRQ4
Note:	on the TI Pro, IRQ4 is connected to the same pin on the expansion bus
	  that IBM connects to IRQ5
SeeAlso: INT 0D"IRQ5",INT 43"TI Professional",INT 45"TI Professional"




INT 45 - TI Professional PC - IRQ5
Note:	on the TI Pro, IRQ5 is connected to the same pin on the expansion bus
	  that IBM connects to IRQ6
SeeAlso: INT 0E"IRQ6",INT 44"TI Professional",INT 46"TI Professional"




INT 46 - TI Professional PC - IRQ6 - FLOPPY DISK CONTROLLER
Note:	on the TI Pro, IRQ6 is connected to the same pin on the expansion bus
	  that IBM connects to IRQ7
SeeAlso: INT 0F"IRQ7",INT 45"TI Professional",INT 47"TI Professional"




INT 47 - TI Professional PC - IRQ7 - KEYBOARD USART
SeeAlso: INT 09"IRQ1",INT 46"TI Professional"




INT 48 - TI Professional PC - SPEAKER DEVICE - SOUND SPEAKER
	AH = 00h
	AL = number of 25ms ticks sound should last
Return: nothing
Desc:	sound the speaker at the current frequency setting (see AH=02h) for
	  the indicated duration
Notes:	this function returns immediately; the sound is terminated by the
	  timer interrupt handler
	if a new sound is requested while one is already in progress, the
	  previous sound is terminated immediately and the new sound takes
	  its place
SeeAlso: AH=01h,AH=02h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Ah,AH=0Bh
SeeAlso: INT 40"TI Professional",INT 49/AH=01h"TI"
SeeAlso: INT 4A/AH=00h"TI",INT 4C"TI Professional",INT 4D/AH=00h




INT 48 - TI Professional PC - SPEAKER DEVICE - CHECK SPEAKER STATUS
	AH = 01h
Return: ZF clear if speaker is currently on
	ZF set if speaker is currently off
SeeAlso: AH=00h,AH=02h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Ah,AH=0Bh




INT 48 - TI Professional PC - SPEAKER DEVICE - SET SPEAKER FREQUENCY
	AH = 02h
	CX = frequency divisor (freq = 1250000 / CX)
Return: nothing
SeeAlso: AH=00h,AH=01h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Ah,AH=0Bh




INT 48 - TI Professional PC - SPEAKER DEVICE - TURN ON SPEAKER
	AH = 03h
Return: nothing
Desc:	turn on the speaker at the current frequency, leaving it on until
	  explicitly turned off with AH=04h or the end of a subsequent
	  AH=00h
SeeAlso: AH=00h,AH=01h,AH=02h,AH=04h,AH=06h,AH=08h,AH=0Ah,AH=0Bh




INT 48 - TI Professional PC - SPEAKER DEVICE - TURN OFF SPEAKER
	AH = 04h
Return: nothing
SeeAlso: AH=00h,AH=01h,AH=02h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Ah,AH=0Bh




INT 48 - TI Professional PC - SPEAKER DEVICE - DELAY
	AH = 05h
	CX = desired delay in milliseconds
Return: after delay expires
Note:	the delay is only approximate, and may be longer than requested
SeeAlso: AH=00h,AH=01h,AH=02h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Ah,AH=0Bh




INT 48 - TI Professional PC - CALCULATE CRC
	AH = 06h
	ES:BX -> memory block for which to calculate CRC
	BP = size of block in bytes
Return: DX = CRC for block
	ZF set if DX = 0000h
Note:	if the CRC of a memory block is appended to the block, then the CRC
	  of the block plus CRC should equal 0000h
SeeAlso: AH=00h,AH=01h,AH=02h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Ah,AH=0Bh




INT 48 - TI Professional PC - PRINT ROM MESSAGE
	AH = 07h
	SI = offset of ASCIZ message string within segment F400h
Return: nothing
SeeAlso: AH=00h,AH=01h,AH=02h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Ah,AH=0Bh




INT 48 - TI Professional PC - DISPLAY SYSTEM ERROR MESSAGE
	AH = 08h
	BX = error number
Return: nothing
Desc:	displays the error message " ** System Error ** - xxxx" where xxxx is
	  the hexadecimal value in BX
SeeAlso: AH=00h,AH=01h,AH=02h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Ah,AH=0Bh




INT 48 - TI Professional PC - GET SYSTEM CONFIGURATION DATA
	AH = 09h
Return: ES:BX -> system configuration word (see #03227)
SeeAlso: AH=00h,AH=01h,AH=02h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Ah,AH=0Bh




INT 48 - TI Professional PC - GET EXTRA SYSTEM CONFIGURATION INFO ADDRESS
	AH = 0Ah
Return: ES:BX -> configuration information (see #03205)
SeeAlso: AH=00h,AH=01h,AH=02h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Bh

Format of TI Professional PC extra system configuration information:
Offset	Size	Description	(Table 03205)
 -3	WORD	memory size in paragraphs
 00h	BYTE	drive type byte (see #03206)
 01h	WORD	extra system configuration word 1
		bit 0: 8087 is present
		bits 15-1: reserved (0)
 03h	WORD	extra system configuration word 2
		bits 15-0: reserved (0)

Bitfields for TI Professional PC drive type byte:
Bit(s)	Description	(Table 03206)
 0	drive A is double-sided
 1	drive A has 80 tracks instead of 40
 2	drive B is double-sided
 3	drive B has 80 tracks instead of 40
 4	drive C is double-sided
 5	drive C has 80 tracks instead of 40
 6	drive D is double-sided
 7	drive D has 80 tracks instead of 40
Note:	the type for drive A is determined by motherboard switches; the
	  remaining drives' types are set from a table in IO.SYS
SeeAlso: #03205




INT 48 - TI Professional PC - GET EXTRA SYSTEM CONFIGURATION INFORMATION
	AH = 0Bh
Return: AL = drive type byte (see #03206)
	BX = extra system configuration word 1 (see #03205)
	CX = extra system configuration word 2 (see #03205)
	AH destroyed
SeeAlso: AH=00h,AH=01h,AH=02h,AH=03h,AH=04h,AH=06h,AH=08h,AH=0Ah




INT 49 - TI Professional PC - CRT - SET CURSOR SIZE AND TYPE
	AH = 01h
	CH = cursor start line (bits 3-0) and status (bits 6-5)
	    status bits:
		00 non-blinking cursor
		01 no cursor
		10 fast-blinking cursor
		11 slow-blinking cursor
	CL = cursor end line
Return: nothing
Note:	AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=02h,AH=03h,INT 40"TI Professional",INT 48/AH=00h"TI Professional"
SeeAlso: INT 4A/AH=00h"TI",INT 4B"TI Professional",INT 4D/AH=00h
SeeAlso: INT 57"TI Professional"




INT 49 - TI Professional PC - CRT - SET CURSOR POSITION
	AH = 02h
	DH = column
	DL = row
Return: DX destroyed
Notes:	AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
	the TI swaps the row and column compared to the equivalent IBM call
SeeAlso: AH=01h,AH=03h




INT 49 - TI Professional PC - CRT - GET CURSOR POSTION AND TYPE
	AH = 03h
Return: CH = cursor start and status (see AH=01h)
	CL = cursor end line
	DH = cursor column
	DL = cursor row
Note:	AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=02h




INT 49 - TI Professional PC - CRT - SCROLL UP/COPY WINDOW
	AH = 06h
	AL = source blanking
	    00h blank source region (move/scroll)
	    nonzero do not blank source region (copy)
	DH,DL = source start column,row
	BH,BL = destination start column,row
	CH = width of region to move/copy
	CL = height of region to move/copy
Return: nothing
Notes:	AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
	the specified region may be wider than the screen, but reliable
	  operation then requires that the height be exactly one row
SeeAlso: AH=01h,AH=02h,AH=07h,AH=13h,AH=14h




INT 49 - TI Professional PC - CRT - SCROLL DOWN/COPY WINDOW
	AH = 07h
	AL = source blanking
	    00h blank source region (move/scroll)
	    nonzero do not blank source region (copy)
	DH,DL = source start column,row
	BH,BL = destination start column,row
	CH = width of region to move/copy
	CL = height of region to move/copy
Return: nothing
Note:	AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=02h,AH=06h,AH=13h,AH=14h




INT 49 - TI Professional PC - CRT - GET CHARACTER AND ATTRIBUTE AT POSITION
	AH = 08h
Return: AL = character at current cursor position
	AH = attribute
Note:	AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=09h,AH=0Ah,AH=0Eh,INT 10/AH=08h




INT 49 - TI Professional PC - CRT - WRITE CHARACTER(S) WITH ATTRIBUTE
	AH = 09h
	AL = character to write
	BL = attribute to use (becomes new current attribute)
	CX = number of times to write character
Return: nothing
Desc:	write CX copies of the character in AL beginning at the current cursor
	  position
Note:	AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=08h,AH=0Ah,AH=0Eh,INT 10/AH=09h




INT 49 - TI Professional PC - CRT - WRITE CHARACTER(S) WITH CURRENT ATTRIBUTE
	AH = 0Ah
	AL = character to write
	CX = number of times to write character
Return: nothing
Desc:	write CX copies of the character in AL beginning at the current cursor
	  position
Note:	AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=02h,AH=08h,AH=09h,AH=0Eh,INT 10/AH=0Ah




INT 49 - TI Professional PC - CRT - TTY OUTPUT
	AH = 0Eh
	AL = character to write
Return: nothing
Desc:	write the character in AL at the current cursor position, advancing
	  the cursor, and interpreting CR, LF, TAB, and BEL characters
Note:	AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=02h,AH=08h,AH=09h,AH=0Ah,INT 10/AH=0Eh




INT 49 - TI Professional PC - CRT - WRITE BLOCK OF CHARACTERS WITH ATTRIBUTE
	AH = 10h
	AL = attribute (becomes new current attribute)
	DX:BX -> string of characters to write
	CX = length of string
Return: nothing
Note:	AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
BUG:	CX must not be 0000h on entry, or the system will crash
SeeAlso: AH=01h,AH=02h,AH=09h,AH=0Eh,AH=11h




INT 49 - TI Professional PC - CRT - WRITE BLOCK OF CHARACTERS WITH CURR ATTRIB
	AH = 11h
	DX:BX -> string of characters to write
	CX = length of string
Return: nothing
Note:	AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
BUG:	CX must not be 0000h on entry, or the system will crash
SeeAlso: AH=01h,AH=02h,AH=09h,AH=0Eh,AH=10h




INT 49 - TI Professional PC - CRT - FILL ENTIRE SCREEN WITH ATTRIBUTE
	AH = 12h
	AL = attribute (see #03210)
Return: nothing
Note:	AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=02h

Bitfields for TI Professional PC screen attribute:
Bit(s)	Description	(Table 03210)
 7	alternate character set (requires user-supplied ROM)
 6	blink
 5	underline
 4	reverse video
 3	character enable
 2	green (color) or 58% intensity (gray-scale)
 1	red (color)  or 27.5% intensity
 0	blue (color) or 14.5% intensity




INT 49 - TI Professional PC - CRT - CLEAR ENTIRE TEXT SCREEN AND HOME CURSOR
	AH = 13h
Return: nothing
Note:	AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=02h,AH=06h,AH=14h




INT 49 - TI Professional PC - CRT - CLEAR ENTIRE GRAPHICS SCREEN
	AH = 14h
Return: nothing
Note:	AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=02h,AH=06h,AH=13h




INT 49 - TI Professional PC - CRT - SET PROTECTED STATUS AREA
	AH = 15h
	CL = row at which to start status area, or 00h to cancel
	CH = 00h
Return: nothing
Desc:	set a protected area of the screen which will not be affected by TTY
	  writes or the scrolls they may generate
Notes:	AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
	the current cursor position must be above the status area in order to
	  set the protected area
SeeAlso: AH=01h,AH=02h




INT 49 - TI Professional PC - CRT - SET ATTRIBUTE LATCH
	AH = 16h
	BL = new attribute (see #03210)
Return: nothing
Note:	AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=02h




INT 49 - TI Professional PC - CRT - GET START-OF-DISPLAY POINTER
	AH = 17h
Return: DX = current offset at which display starts
Note:	AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
SeeAlso: AH=01h,AH=02h,INT 10/AH=FEh




INT 49 - TI Professional PC - CRT - PRINT TTY STRING
	AH = 18h
	CS:BX -> counted string (count byte with length followed by string)
Return: nothing
Notes:	AH=00h,04h,05h,0Bh,0Ch,0Dh,0Fh are documented as NOPs
	the string must be located in the caller's code segment; any TSRs
	  which want to hook INT 49 must check for this function and emulate
	  it, because the BIOS retrieves the caller's CS from the stack
SeeAlso: AH=01h,AH=02h,AH=0Eh




INT 4A - TI Professional PC - KEYBOARD - GET KEYPRESS
	AH = 00h
Return: AX = keystroke (AH=00h for ASCII keys -- no scan code)
SeeAlso: AH=01h,AH=02h,AH=03h,AH=04h,AH=05h,INT 16/AH=00h
SeeAlso: INT 47"TI Professional",INT 48/AH=00h"TI Professional"
SeeAlso: INT 49/AH=01h"TI",INT 4C"TI Professional",INT 4D/AH=00h
SeeAlso: INT 5B"TI Professional"




INT 4A - TI Professional PC - KEYBOARD - GET KEYBOARD STATUS
	AH = 01h
Return: ZF set if no keystroke available
	ZF clear if keystrokes in buffer
	    AX = next keystroke (AH=00h for ASCII keys -- no scan code)
SeeAlso: AH=00h,AH=02h,AH=03h,AH=04h,AH=05h,INT 16/AH=01h




INT 4A - TI Professional PC - KEYBOARD - GET KEYBOARD MODE
	AH = 02h
Return: AL = shift states (see #03213)
SeeAlso: AH=00h,AH=02h,AH=03h,AH=04h,AH=05h,INT 16/AH=02h

Bitfields for TI Professional PC keyboard shift states:
Bit(s)	Description	(Table 03213)
 0	Ctrl key pressed
 1	Alt key pressed
 2	either Shift key pressed
 3-6	0
 7	CapsLock is ON




INT 4A - TI Professional PC - KEYBOARD - FLUSH KEYBOARD BUFFER
	AH = 03h
Return: nothing
SeeAlso: AH=00h,AH=02h,AH=03h,AH=04h,AH=05h




INT 4A - TI Professional PC - KEYBOARD - SEND COMMAND TO KEYBOARD
	AH = 04h
	AL = command
	    00h reset to default states
	    01h enable auto-repeat (default)
	    02h disable auto-repeat
	    03h lock keyboard
	    04h unlock keyboard (default)
	    05h enable keyclick (requires hardware modification to work)
	    06h disable keyclick (default)
Return: nothing
SeeAlso: AH=00h,AH=02h,AH=03h,AH=04h,AH=05h




INT 4A - TI Professional PC - KEYBOARD - INSERT CHARACTER INTO KEYBOARD BUFFER
	AH = 05h
	BX = character code (BH=00h if ASCII character, BL=00h/BH nonzero for
	      extended codes) (see #03214)
Return: ZF set if keyboard buffer was already full
	ZF clear if keystroke inserted into buffer
SeeAlso: AH=00h,AH=02h,AH=03h,AH=04h,AH=05h,INT 5B"TI"

(Table 03214)
Values for TI Professional PC scan/character codes:
 Scan	Key	Normal	Shift	Ctrl	Alt	Notes
 00h	  -- unused
 01h	F5	3F00h	5800h	6200h	6C00h
 02h	F6	4000h	5900h	6300h	6D00h
 03h	F7	4100h	5A00h	6400h	6E00h
 04h	F8	4200h	5B00h	6500h	6F00h
 05h	F9	4300h	5C00h	6600h	7000h
 06h	F10	4400h	5D00h	6700h	7100h
 07h	F11	4500h	0800h	0A00h	0C00h
 08h	F12	4600h	0900h	0B00h	0D00h
 09h	1 !	0031h	0021h	----	7800h
 0Ah	2 @	0032h	0040h	0300h	7900h
 0Bh	3 #	0033h	0023h	----	7A00h
 0Ch	4 $	0034h	0024h	----	7B00h
 0Dh	5 %	0035h	0025h	----	7C00h
 0Eh	6 ^	0036h	005Eh	001Eh	7D00h
 0Fh	7 &	0037h	0026h	----	7E00h
 10h	8 *	0038h	002Ah	----	7F00h
 11h	9 (	0039h	0028h	----	8000h
 12h	0 )	0030h	0029h	----	8100h
 13h	- _	002Dh	005Fh	001Fh	8200h
 14h	= +	003Dh	002Bh	----	8300h
 15h BACK SPACE 0008h	0008h	007Fh	----
 16h	` ~	0060h	007Eh	----	----
 17h	NUM =	003Dh	003Dh	003Dh	8C00h
 18h	NUM +	002Bh	002Bh	002Bh	8D00h
 19h   NUM SPAC	0020h	0020h	0020h	8E00h
 1Ah   NUM TAB	0009h	0F00h	0009h	8F00h
 1Bh	NUM 1	0031h	0031h	0031h	(alt-###)	[Note 5]
 1Ch	(unused)
 1Dh	NUM 0	0030h	0030h	0030h	(alt-###)	[Note 5]
 1Eh  NUM ENTER	000Dh	000Dh	000Dh	----
 1Fh	NUM 4	0034h	0034h	0034h	(alt-###)	[Note 5]
 20h	NUM 5	0035h	0035h	0035h	(alt-###)	[Note 5]
 21h	NUM 9	0039h	0039h	0039h	(alt-###)	[Note 5]
 22h	NUM -	002Dh	002Dh	002Dh	----
 23h	NUM 2	0032h	0032h	0032h	(alt-###)	[Note 5]
 24h-26h  -- unused
 27h	NUM 7	0037h	0037h	0037h	(alt-###)	[Note 5]
 28h	NUM 8	0038h	0038h	0038h	(alt-###)	[Note 5]
 29h	NUM 6	0036h	0036h	0036h	(alt-###)	[Note 5]
 2Ah	NUM ,	002Ch	002Ch	002Ch	----
 2Bh	NUM 3	0033h	0033h	0033h	(alt-###)	[Note 5]
 2Ch	NUM .	002Eh	002Eh	002Eh	----
 2Dh	PRINT	7200h	[Note2]	----	----	[Notes 1,2]
 2Eh   RtArrow	4D00h	8A00h	7400h	4E00h
 2Fh	INS	5200h	2800h	2900h	2A00h	[Note 1]
 30h	DEL	5300h	3800h	3900h	3A00h	[Note 1]
 31h	TAB	0009h	0F00h	0009h	----
 32h	Q	0071h	0051h	0011h	1000h
 33h	W	0077h	0057h	0017h	1100h
 34h	E	0065h	0045h	0005h	1200h
 35h	R	0072h	0052h	0012h	1300h
 36h	T	0074h	0054h	0014h	1400h
 37h	Y	0079h	0059h	0019h	1500h
 38h	U	0075h	0055h	0015h	1600h
 39h	I	0069h	0049h	0009h	1700h
 3Ah	O	006Fh	004Fh	000Fh	1800h
 3Bh	P	0070h	0050h	0010h	1900h
 3Ch	[ {	005Bh	007Bh	001Bh	----
 3Dh	] }	005Dh	007Dh	001Dh	----
 3Eh  LINE FEED	000Ah	000Ah	7500h	4F00h
 3Fh  BRK/PAUS	[Note3]	[Note4]	----	----	[Notes 1,3,4]
 40h  UpArrow	4800h	8800h	8400h	4900h
 41h	ESC	001Bh	001Bh	001Bh	----
 42h	A	0061h	0041h	0001h	1E00h
 43h	S	0073h	0053h	0013h	1F00h
 44h	D	0064h	0044h	0004h	2000h
 45h	F	0066h	0046h	0006h	2100h
 46h	G	0067h	0047h	0007h	2200h
 47h	H	0068h	0048h	0008h	2300h
 48h	J	006Ah	004Ah	000Ah	2400h
 49h	K	006Bh	004Bh	000Bh	2500h
 4Ah	L	006Ch	004Ch	000Ch	2600h
 4Bh	; :	003Bh	003Ah	----	----
 4Ch	' "	0027h	0022h	----	----
 4Dh	RETURN	000Dh	000Dh	000Dh	----
 4Eh	\ |	005Ch	007Ch	001Ch	----
 4Fh  LeftArrow	4B00h	8B00h	7300h	4C00h
 50h	HOME	4700h	8600h	7700h	8500h
 51h  Space Bar	0020h	0020h	0020h	0020h
 52h	Z	007Ah	005Ah	001Ah	2C00h
 53h	X	0078h	0058h	0018h	2D00h
 54h	C	0063h	0043h	0003h	2E00h
 55h	V	0076h	0056h	0016h	2F00h
 56h	B	0062h	0042h	0002h	3000h
 57h	N	006Eh	004Eh	000Eh	3100h
 58h	M	006Dh	004Dh	000Dh	3200h
 59h	, <	002Ch	003Ch	----	----
 5Ah  PRINT	7200h	[Note2]	----	----	[Notes 1,2]
 5Bh	. >	002Eh	003Eh	----	----
 5Ch	/ ?	002Fh	003Fh	----	----
 5Dh	(unused)
 5Eh	DEL	5300h	3800h	3900h	3A00h	[Note 1]
 5Fh	INS	5200h	2800h	2900h	2A00h	[Note 1]
 60h  DownArrow	5000h	8900h	7600h	5100h
 61h-63h  -- unused
 64h  BRK/PAUS	[Note3]	[Note4]	----	----	[Notes 1,3,4]
 65h	F1	3B00h	5400h	5E00h	6800h
 66h	F2	3C00h	5500h	5F00h	6900h
 67h	F3	3D00h	5600h	6000h	6A00h
 68h	F4	3E00h	5700h	6100h	6B00h
 69h-6Fh  -- unused
Notes:	[1] four of the keys can have differing scan codes, depending on the
	  actual keyboard; the BIOS accepts either scan code ("normal": 2Fh,
	  30h, 5Ah, 64h; "alternate": 2Dh,3Fh,5Eh,5Fh) for any of these keys
	[2] Shift-Print invokes INT 5E for a screen dump; the PRTSCRN.DEV
	  device driver also supports Alt-Print, Ctrl-Print, Shift-Alt-Print,
	  and Shift-Ctrl-Print for dumping graphics in various permutations
	[3] BRK/PAUS invokes INT 5C for a pause, then stuffs 0100h into the
	  keyboard buffer
	[4] Shift-BRK/PAUS invokes INT 5D for the Break, then stuffs 0000h
	  into the keyboard buffer; MS-DOS hooks INT 5D to keep the 0000h from
	  appearing in the keyboard buffer
	[5] on the TI Pro, one enters an arbitrary character slightly
	  differently than on a standard PC: exactly three numberpad digits
	  must be pressed (using leading zeros for codes less than 100), and
	  the key for the requested code is inserted into the keyboard buffer
	  immediately on pressing the third key.  The Alt key may be released
	  and re-pressed arbitrarily often between digits without affecting
	  the Alt-digit-digit-digit sequence.
	scan codes with bit 7 set are not key releases, but rather
	  auto-repeated keystrokes, which the BIOS only places into the
	  keyboard buffer if the buffer is empty at the time (thus avoiding
	  typeahead of repeated keystrokes faster than they can be processed)
SeeAlso: #00006 at INT 09




INT 4B - TI Professional PC - PARALLEL PORT - OUTPUT CHARACTER
	AH = 00h
	DL = printer number (00h)
	AL = character to print
Return: AH = printer status (see #03216)
Note:	on the TI Pro, the BIOS only supports DL=00h; MS-DOS versions for the
	  TI hook INT 4B and handle requests for DL<>00h
SeeAlso: AH=01h,AH=02h,INT 17/AH=00h
SeeAlso: INT 40"TI Professional",INT 48/AH=00h"TI Professional"
SeeAlso: INT 49/AH=01h"TI",INT 4C"TI Professional",INT 4D/AH=00h

Bitfields for TI Professional PC printer status:
Bit(s)	Description	(Table 03216)
 0	timeout (function 00h only)
 3-1	unused
 4	busy
 5	paper out
 6	on-line (selected)
 7	fault




INT 4B - TI Professional PC - PARALLEL PORT - INITIALIZE PRINTER
	AH = 01h
	DL = printer number (00h)
Return: AH = printer status (see #03216)
Note:	on the TI Pro, the BIOS only supports DL=00h; MS-DOS versions for the
	  TI hook INT 4B and handle requests for DL<>00h
SeeAlso: AH=00h,AH=02h,INT 17/AH=01h




INT 4B - TI Professional PC - PARALLEL PORT - GET PRINTER STATUS
	AH = 02h
	DL = printer number (00h)
Return: AH = printer status (see #03216)
Note:	on the TI Pro, the BIOS only supports DL=00h; MS-DOS versions for the
	  TI hook INT 4B and handle requests for DL<>00h
SeeAlso: AH=00h,AH=01h,INT 17/AH=02h




INT 4C - TI Professional PC - CLOCK/ANALOG INTERFACE
	no details available
SeeAlso: INT 40"TI Professional",INT 49/AH=01h"TI"
SeeAlso: INT 4A/AH=00h"TI",INT 4B"TI Professional",INT 4D/AH=00h
SeeAlso: INT 58"TI Professional"




INT 4D - TI Professional PC - DISK - RESET DISK SYSTEM
	AH = 00h
	DL = drive (if bit 7 is set both hard disks and floppy disks reset)
Return: AH = status (see #00234 at INT 13/AH=01h)
	CF clear if successful (returned AH=00h)
	CF set on error
Note:	this function is the same as INT 13/AH=00h on a standard PC BIOS
SeeAlso: AH=01h,AH=02h,AH=08h,AH=0Bh,INT 13/AH=00h,INT 46"TI Professional"
SeeAlso: INT 48/AH=00h"TI Professional",INT 4A/AH=00h"TI"




INT 4D - TI Professional PC - DISK - GET STATUS OF LAST OPERATION
	AH = 01h
	DL = drive (bit 7 set for hard disk)
Return: CF clear if status unchanged
	CF set if status changed since last call
	AH = 00h
	AL = status of previous operation (see #00234 at INT 13/AH=01h)
Notes:	this function is nearly the same as INT 13/AH=01h on a standard PC BIOS
	the TI's BIOS tranparently performs a number of retries, and an error
	  status is only reported if all of the retries fail.  To get the error
	  status if the operation succeeded on a retry, use AH=07h instead
SeeAlso: AH=00h,AH=07h,INT 13/AH=01h




INT 4D - TI Professional PC - DISK - READ SECTOR(S) INTO MEMORY
	AH = 02h
	AL = number of sectors to read (must be nonzero)
	CH = low eight bits of cylinder number
	CL = sector number 1-63 (bits 0-5)
	     high two bits of cylinder (bits 6-7, hard disk only)
	DH = head number
	DL = drive number (bit 7 set for hard disk)
	ES:BX -> data buffer
Return: CF set on error
	    if AH = 11h (corrected ECC error), AL = burst length
	CF clear if successful
	AH = status (see #00234 at INT 13/AH=01h)
	AL = number of sectors transferred
	ES:BX -> buffer for last sector processed (including one with errors)
SeeAlso: AH=00h,AH=01h,AH=03h,AH=04h,INT 13/AH=02h




INT 4D - TI Professional PC - DISK - WRITE SECTOR(S) FROM MEMORYv
	AH = 03h
	AL = number of sectors to write (must be nonzero)
	CH = low eight bits of cylinder number
	CL = sector number 1-63 (bits 0-5)
	     high two bits of cylinder (bits 6-7, hard disk only)
	DH = head number
	DL = drive number (bit 7 set for hard disk)
	ES:BX -> buffer containing data
Return: CF set on error
	    if AH = 11h (corrected ECC error), AL = burst length
	CF clear if successful
	AH = status (see #00234 at INT 13/AH=01h)
	AL = number of sectors transferred
	ES:BX -> buffer for last sector processed (including one with errors)
SeeAlso: AH=00h,AH=01h,AH=02h,AH=04h,INT 13/AH=03h




INT 4D - TI Professional PC - DISK - VERIFY DISK SECTOR CRC(S)
	AH = 04h
	AL = number of sectors to verify (must be nonzero)
	CH = low eight bits of cylinder number
	CL = sector number 1-63 (bits 0-5)
	     high two bits of cylinder (bits 6-7, hard disk only)
	DH = head number
	DL = drive number (bit 7 set for hard disk)
	ES:BX -> data buffer
Return: CF set on error
	    if AH = 11h (corrected ECC error), AL = burst length
	CF clear if successful
	AH = status (see #00234 at INT 13/AH=01h)
	AL = number of sectors transferred
	ES:BX -> buffer for last sector processed (including one with errors)
Note:	even though no data is transferred, ES:BX must still be valid
SeeAlso: AH=00h,AH=01h,AH=02h,AH=06h,INT 13/AH=04h




INT 4D - TI Professional PC - DISK - NOP
	AH = 05h
Note:	on the TI Pro, FORMAT.COM contains direct port I/O commands to perform
	  disk formatting, rather than using the BIOS




INT 4D - TI Professional PC - DISK - VERIFY DISK SECTOR(S)
	AH = 06h
	AL = number of sectors to verify (must be nonzero)
	CH = low eight bits of cylinder number
	CL = sector number 1-63 (bits 0-5)
	     high two bits of cylinder (bits 6-7, hard disk only)
	DH = head number
	DL = drive number (bit 7 set for hard disk)
	ES:BX -> data buffer
Return: CF set on error
	    if AH = 11h (corrected ECC error), AL = burst length
	CF clear if successful
	AH = status (see #00234 at INT 13/AH=01h)
	AL = number of sectors transferred
	ES:BX -> buffer for last sector processed (including one with errors)
Note:	even though no data is transferred, ES:BX must still be valid because
	  an actual comparison with disk data is performed, not just the CRC
	  check of the standard PC BIOS or INT 4D/AH=04h
SeeAlso: AH=00h,AH=01h,AH=02h,AH=04h,INT 13/AH=04h




INT 4D - TI Professional PC - DISK - GET RETRY STATUS OF LAST OPERATION
	AH = 07h
	DL = drive (bit 7 set for hard disk)
Return: CF clear if status unchanged
	CF set if status changed since last call
	AH = 00h
	AL = status of previous operation (see #00234 at INT 13/AH=01h)
Notes:	this function is nearly the same as INT 13/AH=01h on a standard PC BIOS
	the TI's BIOS tranparently performs a number of retries; this function
	  returns the error status of a failed operation even if the operation
	  succeeded on a retry
SeeAlso: AH=00h,AH=01h,INT 13/AH=01h




INT 4D - TI Professional PC - DISK - SET STANDARD DEVICE INTERFACE TABLE
	AH = 08h
	DL = drive number (00h-03h)
	AL = drive type
	    00h single-sided 48 tpi (40-track, 8 sectors, 512 bytes/sector)
	    01h double-sided 48 tpi (40-track, 8 sectors, 512 bytes/sector)
	    02h single-sided 96 tpi (80-track, 8 sectors, 512 bytes/sector)
	    03h double-sided 96 tpi (80-track, 8 sectors, 512 bytes/sector)
Return: nothing???
SeeAlso: AH=00h,AH=09h




INT 4D - TI Professional PC - DISK - SET DEVICE INTERFACE TABLE ADDRESS
	AH = 09h
	DL = drive number (00h-07h)
	ES:BX -> Device Interface Table (see #03226)
Return: nothing???
SeeAlso: AH=00h,AH=08h,AH=0Ah,INT 1E

Format of TI Professional PC Device Interface Table:
Offset	Size	Description	(Table 03226)
 00h	DWORD	-> entry point for disk routine
 04h	WORD	bytes per sector
 06h	BYTE	sectors per track
 07h	BYTE	number of heads
 08h	BYTE	number of cylinders
 09h	BYTE	retry count
 0Ah	BYTE	precompensation start
SeeAlso: #01264 at INT 1E




INT 4D - TI Professional PC - DISK - GET DEVICE INTERFACE TABLE ADDRESS
	AH = 0Ah
	DL = drive number (00h-07h)
Return: AH = status
	ES:BX -> Device Interface Table (see #03226)
SeeAlso: AH=00h,AH=08h,AH=09h,INT 1E




INT 4D - TI Professional PC - DISK - TURN OFF ALL DRIVES
	AH = 0Bh
Return: AH = 00h
Note:	used for diagnostics or to conserve power
SeeAlso: AH=00h




INT 4E - TI Professional PC - TIME-OF-DAY CLOCK - SET BIOS DATE
	AH = 00h
	BX = number of days since January 1, 1980
Return: nothing
SeeAlso: AH=01h,AH=02h
SeeAlso: INT 40"TI Professional",INT 48/AH=00h"TI Professional"
SeeAlso: INT 4A/AH=00h"TI",INT 4F"TI Professional"




INT 4E - TI Professional PC - TIME-OF-DAY CLOCK - SET BIOS TIME
	AH = 01h
	CH = hours
	CL = minutes
	DH = seconds
	DL = hundredths
Return: nothing
Note:	the BIOS does not validate the data passed to this function
SeeAlso: AH=00h,AH=02h




INT 4E - TI Professional PC - TIME-OF-DAY CLOCK - GET
BIOS DATE AND TIME
	AH = 02h
Return: AX = number of days since January 1, 1980
	CH = hours
	CL = minutes
	DH = seconds
	DL = hundredths
SeeAlso: AH=00h,AH=01h




INT 4F - TI Professional PC - SYSTEM CONFIGURATION CALL
Return: AX = system configuration word (see #03227)
	BX = size of contiguous DOS memory in paragraphs
SeeAlso: INT 11"BIOS",INT 12"BIOS",INT 40"TI Professional",INT 48/AH=09h
SeeAlso: INT 49/AH=01h"TI",INT 4B"TI Professional",INT 4D/AH=00h
SeeAlso: INT 4E"TI Professional"

Bitfields for TI Professional PC system configuration:
Bit(s)	Description	(Table 03227)
 0	floppy drive 0 (A:, internal) installed
 1	floppy drive 1 (B:, internal) installed
 2	floppy drive 2 (C:, external) installed
 3	floppy drive 3 (D:, external) installed
 4	drive A: is 96tpi (80 tracks)
 5	drive A: is double-sided
 6	60 Hz power instead of 50 Hz
 7	hard disk (E: or E:/F:) installed
 8	serial port 1 installed
 9	serial port 2 installed
 10	serial port 3 installed
 11	serial port 4 installed
 14-12	installed graphics RAM
	000 none (text-only system)
	001 bank A only (graphics limited to 2 of 8 colors)
	111 banks A/B/C (graphics supports 8 of 8 colors)
 15	clock/analog board installed




INT 50 - TI Professional PC - FATAL SOFTWARE ERROR TRAP
Desc:	the default handler generates a System Error message and halts the
	  computer such that only Ctrl-Alt-Del can restart operation
Note:	documented as "for system use only"; intended for multi-tasking
	  software
SeeAlso: INT 40"TI Professional",INT 4F"TI Professional"
SeeAlso: INT 51"TI Professional",INT 53"TI Professional"




INT 51 - TI Professional PC - RESTART TIMING EVENT
	AX = timer count in 25ms intervals
	DS:DI -> timing-event table (see #03244)
Note:	documented as "for system use only"; intended for multi-tasking
	  software
SeeAlso: INT 50"TI Professional",INT 52"TI Professional"

Format of TI Professional PC timing event table:
Offset	Size	Description	(Table 03244)
 00h	WORD	offset of next event table entry
 02h	BYTE	normally unused (FFh)
 03h	BYTE	flags:
		bit 7 set if timing event active
		bits 6-0 not used by BIOS (0), but could be used by option ROMs
 04h	WORD	timeout count (decremented every 25ms when active)
 06h	WORD	offset of event handler (in segment F400h) to call on event
		  timeout; the F400h segment allows addressing both system ROMs
		  and the first 16K of memory (due to the 1M memory wraparound)




INT 52 - TI Professional PC - CANCEL TIMING EVENT
	DS:DI -> timing-event table (see #03244)
Note:	documented as "for system use only"; intended for multi-tasking
	  software
SeeAlso: INT 51"TI Professional",INT 53"TI Professional"




INT 53 - TI Professional PC - SVC INTERFACE
Notes:	documented as "for system use only"; intended for multi-tasking
	  software
	this interrupt is not used by the BIOS; the default handler generates
	  a system error trap (see INT 51"TI Professional")
SeeAlso: INT 50"TI Professional",INT 54"TI Professional"




INT 54 - TI Professional PC - ACTIVATE TASK SUBROUTINE
Notes:	documented as "for system use only"; intended for multi-tasking
	  software
	this interrupt is not used by the BIOS; the default handler generates
	  a system error trap (see INT 51"TI Professional")
SeeAlso: INT 50"TI Professional",INT 53"TI Professional"




INT 55 - TI Professional PC - RESERVED FOR FUTURE USE
Notes:	documented as "for system use only"; intended for multi-tasking
	  software
	this interrupt is not used by the BIOS; the default handler generates
	  a system error trap (see INT 51"TI Professional")
SeeAlso: INT 50"TI Professional",INT 56"TI Professional"




INT 56 - TI Professional PC - RESERVED FOR FUTURE USE
Notes:	documented as "for system use only"; intended for multi-tasking
	  software
	this interrupt is not used by the BIOS; the default handler generates
	  a system error trap (see INT 51"TI Professional")
SeeAlso: INT 50"TI Professional",INT 55"TI Professional"




INT 57 - C TI Professional PC - CRT MAPPING HOOK
	AX/BX/CX/DX/BP/SI/DI same as on entry to CRT subroutine (e.g. INT 49)
	DS = BIOS system segment
	ES = DE00h
Return: DF/IF flags must be preserved
	ES,DS,BP preserved
	AX,BX,CX,DX,SI,DI may be changed as necessary to modify the original
	  call
Desc:	hooking this vector permits programs to intercept or modify all
	  screen output, including both application calls to INT 49 and
	  calls generated internally by the BIOS which bypass INT 49
Note:	by default, this vector points at an IRET instruction
SeeAlso: INT 49/AH=01h"TI",INT 50"TI Professional"




INT 58 C - TI Professional PC - SYSTEM TIMER 25ms HOOK
Desc:	called from the hardware timer tick interrupt, after executing the
	  first four BIOS timing events, updating the system clock, invoking
	  INT 5A if required, saving registers, and switching to a temporary
	  stack (the one reserved for IRQ3)
Notes:	the handler for this interrupt may destroy AX,BX,DI,ES but must
	  preserve all other registers; 8 WORDs of stack space are available,
	  of which at most 4 may be used if the handler enables interrupts
	if the handler switches stacks (because more than 4/8 WORDs are
	  required), the original stack must be restored before chaining to
	  the previous handler
SeeAlso: INT 43"TI Professional",INT 4C"TI Professional"
SeeAlso: INT 5A"TI Professional"




INT 59 - TI Professional PC - COMMON ROM HARDWARE INTERRUPT EXIT VECTOR
Desc:	all hardware interrupts on the TI Pro jump indirectly to the handler
	  pointed at by this interrupt vector to finish their handling of
	  the hardware interrupt
Notes:	the default handler decrements the interrupt count, restores registers
	  (including the stack pointer), sends an EOI to the interrupt
	  controller, and finally does an IRET
	can be used by multitaskers which need to get control after every
	  hardware interrupt
SeeAlso: INT 40"TI Professional",INT 47"TI Professional"
SeeAlso: INT 53"TI Professional"




INT 5A C - TI Professional PC - SYSTEM TIMER 100ms HOOK
Desc:	called from the hardware timer tick interrupt, after executing the
	  first four BIOS timing events, updating the system clock, saving
	  registers, and switching to a temporary stack (the one reserved
	  for IRQ3), but before calling INT 58
	no details available
Notes:	this interrupt is invoked on every fourth timer interrupt
	the handler for this interrupt may destroy AX,BX,DI,ES but must
	  preserve all other registers; 8 WORDs of stack space are available,
	  of which at most 4 may be used if the handler enables interrupts
	if the handler switches stacks (because more than 4/8 WORDs are
	  required), the original stack must be restored before chaining to
	  the previous handler
SeeAlso: INT 43"TI Professional",INT 4C"TI Professional"
SeeAlso: INT 58"TI Professional"




INT 5B C - TI Professional PC - KEYBOARD MAPPING HOOK
	CF set
	AH = shift state (see #03247)
	AL = scan code (see #03214)
Return:	BX, CX, DI, ES may be destroyed
	various return methods are supported:
	    IRET, AX unchanged: process keystroke normally
	    IRET, AL = FFh: discard keystroke
	    IRET, AX changed: process modified keystroke
	    chain to old INT 5B: allow other handlers to look at (possibly
		  modified) keystroke in AX
	    RETF 2, CF clear: place returned AX into keyboard buffer without
		  any further processing
Notes:	invoked by the keyboard ISR, and used to remap the keyboard
	if CF is clear on entry, some other handler has processed the
	  keystroke and the current handler should not modify it, instead
	  performing a RETF 2 or IRET (after clearing CF on the stack)
	when requesting that a value be placed directly into the keyboard
	  buffer, AL and AH may not *both* be nonzero (the TI does not
	  return scan codes as part of the key code for non-extended keys)
SeeAlso: INT 15/AH=4Fh,INT 4A/AH=00h"TI",INT 59"TI Professional"
SeeAlso: INT 5C"TI Professional",INT 5D"TI Professional"
SeeAlso: INT 5E"TI Professional",INT 5F"TI Professional"

Bitfields for TI Professional PC keyboard mapping hook shift states:
Bit(s)	Description	(Table 03247)
 7	CAPS LOCK is on
 6-4	reserved (0)
 3	repeated key
 2	Shift is pressed
 1	Alt is pressed
 0	Ctrl is pressed




INT 5C C - TI Professional PC - KEYBOARD PAUSE KEY VECTOR
	AX = 0100h
	CF clear
Return: CF clear
	    AX = keystroke to be placed into keyboard buffer
	CF set
	    AX ignored
Desc:	toggle a pause flag which is checked by the CRT Device Service Routine
	  (see INT 49/AH=01h"TI") and causes it to temporarily halt the
	  machine on the next video-related function (until a key is pressed)
SeeAlso: INT 09"IRQ1",INT 4A/AH=00h"TI",INT 59"TI Professional"
SeeAlso: INT 5B"TI Professional",INT 5D"TI Professional"
SeeAlso: INT 5E"TI Professional",INT 5F"TI Professional"




INT 5D C - TI Professional PC - KEYBOARD BREAK KEY VECTOR
	CF clear
	AX = 0000h
Return: CF clear
	    AX = keystroke to place into keyboard buffer
	CF set
	    AX ignored
Desc:	invoked by the keyboard ISR when Shift-BrkPause is pressed
Note:	the default handler is a simple IRET instruction
SeeAlso: INT 09"IRQ1",INT 4A/AH=00h"TI",INT 59"TI Professional"
SeeAlso: INT 5B"TI Professional",INT 5C"TI Professional"
SeeAlso: INT 5E"TI Professional",INT 5F"TI Professional"




INT 5E C - TI Professional PC - KEYBOARD PRINT-SCREEN VECTOR
	CF set
Return: CF clear
	    AX = keystroke to be placed into keyboard buffer
	CF set
	    AX ignored
Desc:	hook to dump the screen to the printer
Notes:	hooked by TI MS-DOS, which provides a PRTSCRN character device which
	  can invoke screen prints when a decimal digit (indicating the type
	  of screen dump) is written to it
	the TI MS-DOS print-screen routine allows selective dumps of text
	  only, graphics only, or text and graphics superimposed, in either
	  normal or reverse, by pressing the appropriate keystroke combination:
	  Shift-Print, Ctrl-Print, Alt-Print, Shift-Alt-Print, Ctrl-Alt-Print,
	  or Shift-Ctrl-Print.
	the BIOS default routine for this vector is an IRET
SeeAlso: INT 05"PRINT SCREEN",INT 4A/AH=00h"TI",INT 59"TI Professional"
SeeAlso: INT 5B"TI Professional",INT 5C"TI Professional"
SeeAlso: INT 5D"TI Professional",INT 5F"TI Professional"




INT 5F C - TI Professional PC - KEYBOARD QUEUEING VECTOR
Return: all registers preserved
Desc:	hook for multitaskers to be informed when a keypress is placed in the
	  keyboard buffer
Note:	the default handler is a simple IRET instruction
SeeAlso: INT 09,INT 4A/AH=00h"TI",INT 59"TI Professional"
SeeAlso: INT 5B"TI Professional",INT 5C"TI Professional"
SeeAlso: INT 5D"TI Professional",INT 5E"TI Professional"




INT 60 - TI Professional PC - SYSTEM ROM DATA AREA POINTER (NOT A VECTOR!)
Desc:	the low word of this vector contains the segment of the RAM data area
	  to be used by the system ROM at F400h:A000h, and the high word
	  contains the length of the data area (see #03263)
SeeAlso: INT 61"TI Professional PC",INT 66"TI Professional PC"

Format of TI Professional System ROM data area:
Offset	Size	Description	(Table 03263)
 00h	BYTE	port 00h shadow
 01h	BYTE	port 03h shadow
 02h	BYTE	port 04h shadow
 03h	WORD	system configuration word (see #03266)
 05h	BYTE	25ms count
 06h	WORD	offset of timing event 1 (0008h)
 08h	WORD	(event 1) offset of timing event 2 (0010h)
 0Ah	BYTE	(event 1) unused (FFh)
 0Bh	BYTE	(event 1) active flag (bit 7 set if on)
 0Ch	WORD	(event 1) count-down until end of event
 0Eh	WORD	(event 1) event routine (in segment F400h) to call at timeout
 10h	WORD	(event 2) offset of timing event 3 (0018h)
 12h	BYTE	(event 2) unused (FFh)
 13h	BYTE	(event 2) active flag (bit 7 set if on)
 14h	WORD	(event 2) count-down until end of event
 16h	WORD	(event 2) event routine (in segment F400h) to call at timeout
 18h	WORD	(event 3) offset of timing event 3 (0020h)
 1Ah	BYTE	(event 3) unused (FFh)
 1Bh	BYTE	(event 3) active flag (bit 7 set if on)
 1Ch	WORD	(event 3) count-down until end of event
 1Eh	WORD	(event 3) event routine (in segment F400h) to call at timeout
 20h	WORD	(event 4) 0000h - last event
 22h	BYTE	(event 4) unused (FFh)
 23h	BYTE	(event 4) active flag (bit 7 set if on)
 24h	WORD	(event 4) count-down until end of event
 26h	WORD	(event 4) event routine (in segment F400h) to call at timeout
 28h	WORD	offset of start of text display within segment DE00h
 2Ah	WORD	end of display
 2Ch	WORD	current absolute cursor position
 2Eh	WORD	start of current character row
 30h	WORD	current cursor column
 32h	WORD	cursor type and size (see #03264)
 34h	WORD	start of protected status region on screen (0000h = none)
 36h	BYTE	pop flag used by some ROM routines
		00h pop registers before return
		nonzero: do not pop
 37h	BYTE	unused (FFh)
 38h	BYTE	PAUSE flag
		00h off
		FFh on
 39h	BYTE	temp: current attribute while moving characters on screen
 3Ah	WORD	start of keyboard queue (next key at start+2 or 0042h if 0060h)
 3Ch	WORD	end of keyboard queue (next key inserted at end+2 or 0042h)
 3Eh	BYTE	number of characters in buffer
 3Fh	BYTE	keyboard mode flags (see #03265)
 40h	BYTE	Alt-digit-digit-digit accumulator
 41h	BYTE	Alt-digit-digit-digit count of digits (mod 3)
 42h 16 WORDs	keyboard buffer (circular queue)
 62h  8 DWORDs	Drive Interface Table pointers for floppies A:-D: + four others
		(0000h:0000h if pointer not in use)
 82h	BYTE	disk-error retry count (incremented on each disk error)
 83h  2	BYTEs	BIOS scratch space
 85h  8 BYTEs	current cylinder number for drives 0-7
		FFh = unknown
 8Dh	BYTE	BIOS scratch space
 8Eh	BYTE	hard error code for last disk access
		00h operation successful
 8Fh  8 BYTEs	save area for disk DSR parameters
 97h  6 BYTEs	current drive status
 9Dh	BYTE	retry error status
 9Eh	BYTE	BIOS scratch space
 9Fh  7 BYTEs	???
 A6h  2	WORDs	INT 47 save area for SS,SP
 AAh  2	WORDs	INT 46 save area for SS,SP
 AEh  2	WORDs	INT 43 save area for SS,SP
 B2h  2	WORDs	save area for SS,SP to be restored by common intr. exit routine
 B6h 24 WORDs	stack for INT 47
 E6h 24 WORDs	stack for INT 46
116h 17 WORDs	stack for INT 43
13Ah  6 BYTEs	system date and time (hundredths, seconds, minutes, hours, and
		  WORD days since 01jan1980)
Note:	timing event 1 is the disk I/O timeout, event 2 is the floppy disk
	  motor timeout, event 3 is the floppy disk motor spin-up time, and
	  event 4 is used to turn off the speaker after a delay

Bitfields for TI Professional PC cursor size and type:
Bit(s)	Description	(Table 03264)
 15	reserved (0)
 14-13	cursor type
	00 nonblinking
	01 off
	10 slow blink
	11 fast blink
 12-8	starting scan line (0-11)
 7-5	reserved (0)
 4-0	ending scan line (0-11)
SeeAlso: #03263

Bitfields for TI Professional PC keyboard mode flags:
Bit(s)	Description	(Table 03265)
 7	CapsLock was ON at last keypress
 6-4	reserved (0)
 3	repeat key
 2	Shift was down at last keypress
 1	Alt was down at last keypress
 0	Ctrl was down at last keypress
SeeAlso: #03263

Bitfields for TI Professional System Configuration Word:
Bit(s)	Description	(Table 03266)
 0	drive A: installed
 1	drive B: installed
 2	drive C: installed
 3	drive D: installed
 4	drive A: is 80-track
 5	drive A: is double-sided
 6	60-Hz (USA,etc.) system instead of 50-Hz (Europe)
 7	hard disk installed
 8	serial port 1 installed
 9	serial port 2 installed
 10	serial port 3 installed
 11	serial port 4 installed
 14-12	installed graphics planes
	000 none
	001 plane A
	111 planes A, B, and C
 15	clock installed
SeeAlso: #03263




INT 61 - TI Professional PC - FACTORY ROM DATA AREA POINTER (NOT A VECTOR!)
Desc:	the low word of this vector contains the segment of the RAM data area
	  to be used by the expansion ROM at F400h:0000h, and the high word
	  contains the length of the data area; this segment and size are
	  both set to 0000h if no ROM is installed at F400h:0000h
SeeAlso: INT 60"TI Professional PC",INT 62"TI Professional"
SeeAlso: INT 66"TI Professional PC"




INT 62 - TI Professional PC - OPTION ROM DATA AREA POINTER (NOT A VECTOR!)
Desc:	the low word of this vector contains the segment of the RAM data area
	  to be used by the expansion ROM at F400h:2000h, and the high word
	  contains the length of the data area; this segment and size are
	  both set to 0000h if no ROM is installed at F400h:2000h
SeeAlso: INT 61"TI Professional PC",INT 63"TI Professional"
SeeAlso: INT 66"TI Professional PC"




INT 63 - TI Professional PC - OPTION ROM DATA AREA POINTER (NOT A VECTOR!)
Desc:	the low word of this vector contains the segment of the RAM data area
	  to be used by the expansion ROM at F400h:4000h, and the high word
	  contains the length of the data area; this segment and size are
	  both set to 0000h if no ROM is installed at F400h:4000h
SeeAlso: INT 60"TI Professional PC",INT 62"TI Professional"
SeeAlso: INT 64"TI Professional PC"




INT 64 - TI Professional PC - OPTION ROM DATA AREA POINTER (NOT A VECTOR!)
Desc:	the low word of this vector contains the segment of the RAM data area
	  to be used by the expansion ROM at F400h:6000h, and the high word
	  contains the length of the data area; this segment and size are
	  both set to 0000h if no ROM is installed at F400h:6000h
SeeAlso: INT 60"TI Professional PC",INT 63"TI Professional"
SeeAlso: INT 65"TI Professional PC"




INT 65 - TI Professional PC - OPTION ROM DATA AREA POINTER (NOT A VECTOR!)
Desc:	the low word of this vector contains the segment of the RAM data area
	  to be used by the expansion ROM at F400h:8000h, and the high word
	  contains the length of the data area; this segment and size are
	  both set to 0000h if no ROM is installed at F400h:8000h
SeeAlso: INT 60"TI Professional PC",INT 64"TI Professional"
SeeAlso: INT 66"TI Professional PC"




INT 66 - TI Professional PC - SYSTEM INFORMATION (NOT A VECTOR!)
Desc:	the low word of this vector contains the system memory size in
	  paragraphs; the third byte contains the number of outstanding
	  interrupt requests, and the fourth byte contains a description
	  of the installed drive types (see #03517)
SeeAlso: INT 60"TI Professional PC",INT 67"TI Professional"

Bitfields for TI Professional drive type information:
Bit(s)	Description	(Table 03517)
 7	floppy drive D: has 80 tracks
 6	floppy drive D: is double-sided
 5	floppy drive C: has 80 tracks
 4	floppy drive C: is double-sided
 3	floppy drive B: has 80 tracks
 2	floppy drive B: is double-sided
 1	floppy drive A: has 80 tracks
 0	floppy drive A: is double-sided




INT 67 - TI Professional PC - SYSTEM DATA (NOT A VECTOR!)
Desc:	this vector contains the TI Pro's system configuration words
	  (see #03521)
SeeAlso: INT 66"TI Professional PC"

Bitfields for TI Professional PC System Configuration doubleword:
Bit(s)	Description	(Table 03521)
 0	8087 present
 31-1	reserved (0)