Index for interrupt INT 4A
Table of Contents by Order
4A - INT 4A C - SYSTEM - USER ALARM HANDLER
4A - INT 4A - Z100 - Slave 8259 - S100 vectored line 2
4A - INT 4A - Tandy 2000 - PRINT SCREEN
4A - INT 4A - Acorn BBC Master 512 - "OSWORD" - MISC FUNCTIONS USING CONTROL BLOCK
4A00 - INT 4A - TI Professional PC - KEYBOARD - GET KEYPRESS
4A01 - INT 4A - TI Professional PC - KEYBOARD - GET KEYBOARD STATUS
4A02 - INT 4A - TI Professional PC - KEYBOARD - GET KEYBOARD MODE
4A03 - INT 4A - TI Professional PC - KEYBOARD - FLUSH KEYBOARD BUFFER
4A04 - INT 4A - TI Professional PC - KEYBOARD - SEND COMMAND TO KEYBOARD
4A05 - INT 4A - TI Professional PC - KEYBOARD - INSERT CHARACTER INTO KEYBOARD BUFFER
INT 4A C - SYSTEM - USER ALARM HANDLER Desc: This interrupt is invoked by the BIOS when a real-time clock alarm occurs; an application may use it to perform an action at a predetermined time. Note: this interrupt is called from within a hardware interrupt handler, so all usual precautions against reentering DOS must be taken SeeAlso: INT 1A/AH=06hTop
INT 4A - Z100 - Slave 8259 - S100 vectored line 2 SeeAlso: INT 49"Z100",INT 4B"Z100"Top
INT 4A - Tandy 2000 - PRINT SCREEN Note: this interrupt is identical to INT 05 SeeAlso: INT 05"PRINT SCREEN"Top
INT 4A - Acorn BBC Master 512 - "OSWORD" - MISC FUNCTIONS USING CONTROL BLOCK AL = function code FAh transfer data between 80186 and 65C12 I/O processor DS:BX -> control block (see #03211) Return: FLAGS destroyed control block updated Note: there are more functions than are listed here, but details are not available SeeAlso: INT 40"Acorn",INT 4B"Acorn",INT 4C"Acorn" Format of BBC Master control block for function FAh: Offset Size Description (Table 03211) 00h BYTE number of parameters sent to I/O processor (0Dh,0Eh) 01h BYTE number of parameters read from I/O processor (01h) 02h DWORD I/O processor address 06h DWORD 80186 segment:offset address 0Ah WORD number of bytes to transfer 0Ch BYTE operation type 00h write to 65C12 at 24 us/byte 01h read from 65C12 at 24 us/byte 02h write to 65C12 at 26 us/word 03h read from 65C12 at 26 us/word 04h write to 65C12 at 10 us/byte using 256-byte blocks 05h read from 65C12 at 10 us/byte using 256-byte blocks 0Dh BYTE 65C12 memory access control (only used if offset 00h = 0Eh) (see #03212) Bitfields for 65C12 memory access control: Bit(s) Description (Table 03212) 7 unused 6 always use main screen memory if I/O addr 3000h-7FFFh (overrides bit 5) 5 use shadow screen memory if screen address specified 4 use current ROM rather than ROM selected by bits 3-0 (only if I/O address between 8000h and BFFFh) 3-0 paged ROM numberTop
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"Top
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=01hTop
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 ONTop
INT 4A - TI Professional PC - KEYBOARD - FLUSH KEYBOARD BUFFER AH = 03h Return: nothing SeeAlso: AH=00h,AH=02h,AH=03h,AH=04h,AH=05hTop
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=05hTop
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
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