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> OS Construction > Two scancodes being sent after keypress? |
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edfed 22 Nov 2007, 02:18
this comes from david jurgens's HELPPC reference
Code: ^INT 9 - Hardware Keyboard Make/Break Codes % Key Make Break Key Make Break Backspace 0E 8E F1 3B BB Caps Lock 3A BA F2 3C BC Enter 1C 9C F3 3D BD Esc 01 81 F4 3E BE Left Alt 38 B8 F7 41 C1 Left Ctrl 1D 9D F5 3F BF Left Shift 2A AA F6 40 C0 Num Lock 45 C5 F8 42 C2 Right Shift 36 B6 F9 43 C3 Scroll Lock 46 C6 F10 44 C4 Space 39 B9 F11 57 D7 Sys Req (AT) 54 D4 F12 58 D8 Tab 0F 8F % Keypad Keys Make Break Keypad 0 (Ins) 52 D2 Keypad 1 (End) 4F CF Keypad 2 (Down arrow) 50 D0 Keypad 3 (PgDn) 51 D1 Keypad 4 (Left arrow) 4B CB Keypad 5 4C CC Keypad 6 (Right arrow) 4D CD Keypad 7 (Home) 47 C7 Keypad 8 (Up arrow) 48 C8 Keypad 9 (PgUp) 49 C9 Keypad . (Del) 53 D3 Keypad * (PrtSc) 37 B7 Keypad - 4A CA Keypad + 4E CE % Key Make Break Key Make Break A 1E 9E N 31 B1 B 30 B0 O 18 98 C 2E AE P 19 99 D 20 A0 Q 10 90 E 12 92 R 13 93 F 21 A1 S 1F 9F G 22 A2 T 14 94 H 23 A3 U 16 96 I 17 97 V 2F AF J 24 A4 W 11 91 K 25 A5 X 2D AD L 26 A6 Y 15 95 M 32 B2 Z 2C AC % Key Make Break Key Make Break 1 02 82 - 0C 8C 2 03 83 = 0D 8D 3 04 84 [ 1A 9A 4 05 85 ] 1B 9B 5 06 86 ; 27 A7 6 07 87 ' 28 A8 7 08 88 ` 29 A9 8 09 89 \ 2B AB 9 0A 8A , 33 B3 0 0B 8B . 34 B4 / 35 B5 ^Enhanced Keyboard Keys (101/102 keys) % Control Keys Make Break Alt-PrtSc (SysReq) 54 D4 Ctrl-PrtSc E0 37 E0 B7 Enter E0 1C E0 9C PrtSc E0 2A E0 37 E0 B7 E0 AA Right Alt E0 38 E0 B8 Right Ctrl E0 1D E0 9D Shift-PrtSc E0 37 E0 B7 / E0 35 E0 B5 Pause E1 1D 45 E1 9D C5 (not typematic) Ctrl-Pause (Ctrl-Break) E0 46 E0 C6 (not typematic) - Keys marked as "not typematic" generate one stream of bytes without corresponding break scan code bytes (actually the break codes are part of the make code). % Normal Mode or % Shift w/Numlock % Key Make Break ÚÄÄÄÄÄ Numlock on ÄÄÄÄÄÄ¿ % Make Break Del E0 53 E0 D3 E0 2A E0 53 E0 D3 E0 AA Down arrow E0 50 E0 D0 E0 2A E0 50 E0 D0 E0 AA End E0 4F E0 CF E0 2A E0 4F E0 CF E0 AA Home E0 47 E0 C7 E0 2A E0 47 E0 C7 E0 AA Ins E0 52 E0 D2 E0 2A E0 52 E0 D2 E0 AA Left arrow E0 4B E0 CB E0 2A E0 4B E0 CB E0 AA PgDn E0 51 E0 D1 E0 2A E0 51 E0 D1 E0 AA PgUp E0 49 E0 C9 E0 2A E0 49 E0 C9 E0 AA Right arrow E0 4D E0 CD E0 2A E0 4D E0 CD E0 AA Up arrow E0 48 E0 C8 E0 2A E0 48 E0 C8 E0 AA % Key ÚÄÄLeft Shift PressedÄÄ¿ ÚÄÄRight Shift PressedÄÄ¿ % Make Break Make Break Del E0 AA E0 53 E0 D3 E0 2A E0 B6 E0 53 E0 D3 E0 36 Down arrow E0 AA E0 50 E0 D0 E0 2A E0 B6 E0 50 E0 D0 E0 36 End E0 AA E0 4F E0 CF E0 2A E0 B6 E0 4F E0 CF E0 36 Home E0 AA E0 47 E0 C7 E0 2A E0 B6 E0 47 E0 C7 E0 36 Ins E0 AA E0 52 E0 D2 E0 2A E0 B6 E0 52 E0 D2 E0 36 Left arrow E0 AA E0 4B E0 CB E0 2A E0 B6 E0 4B E0 CB E0 36 PgDn E0 AA E0 51 E0 D1 E0 2A E0 B6 E0 51 E0 D1 E0 36 PgUp E0 AA E0 49 E0 C9 E0 2A E0 B6 E0 49 E0 C9 E0 36 Right arrow E0 AA E0 4D E0 CD E0 2A E0 B6 E0 4D E0 CD E0 36 Up arrow E0 AA E0 48 E0 C8 E0 2A E0 B6 E0 48 E0 C8 E0 36 / E0 AA E0 35 E0 B5 E0 2A E0 B6 E0 35 E0 B5 E0 36 - The PS/2 models have three make/break scan code sets. The first set matches the PC & XT make/break scan code set and is the one listed here. Scan code sets are selected by writing the value F0 to the keyboard via the ~8042~ (port 60h). The following is a brief description of the scan code sets (see the PS/2 Technical Reference manuals for more information on scan code sets 2 and 3): ù set 1, each key has a base scan code. Some keys generate extra scan codes to generate artificial shift states. This is similar to the standard scan code set used on the PC and XT. ù set 2, each key sends one make scan code and two break scan codes bytes (F0 followed by the make code). This scan code set is available on the IBM AT also. ù set 3, each key sends one make scan code and two break scan codes bytes (F0 followed by the make code) and no keys are altered by Shift/Alt/Ctrl keys. ù typematic scan codes are the same as the make scan code - Some Tandy 1000's do not handle Alt key combinations when multiple shift keys are pressed. The Alt-Shift-H combination loses the Alt. - extended keys like (F11, F12) can only be read with systems that have extended keyboard BIOS support (or ~INT 9~ extensions); to read these special keys on these systems ~INT 16,10~ must be used - see ~SCAN CODES~ ~KB FLAGS~ ~KEYBOARD COMMANDS~ hope/think/believe it is helpfull! |
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22 Nov 2007, 02:18 |
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edfed 22 Nov 2007, 02:38
you can increase clrscrn's speed:
Code: ClrScrn: push ecx ebx eax ds mov ax,10h mov ds,ax mov ebx,0B8000h mov eax,499 mov ecx,1B201B20h @@: mov [ebx+eax*4],ecx dec eax jl @b pop ds eax ebx ecx ret and less space Code: cls: push eax ebx ds mov ax,screenB8 mov ds,ax mov eax,499 mov ebx,1B201B20h @@: mov [eax*4],ebx dec eax jnl @b pop ds eax ebx |
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22 Nov 2007, 02:38 |
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rhyno_dagreat 22 Nov 2007, 03:26
Thanks! That really does help. 80h is added to each scancode when the key is up.
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22 Nov 2007, 03:26 |
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edfed 22 Nov 2007, 03:31
not 80h added
bit 7 set to 1 for break code but be carefull there are a lot of extra codes like E0h EEh C0h etc thats indicate the scancode is a multiple scancode you must save these "unsused" codes for the next read |
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22 Nov 2007, 03:31 |
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rhyno_dagreat 22 Nov 2007, 04:24
bit 7 out of 0-7 or bit 7 out of 1-8?
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22 Nov 2007, 04:24 |
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rhyno_dagreat 22 Nov 2007, 04:39
Okay... so now I'm trying to store my scancode value in an unused register (BL), and then OR the contents of BL with 80h (10000000b) then store the result into a variable, and it's giving me an invalid opcode error.
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22 Nov 2007, 04:39 |
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rhyno_dagreat 22 Nov 2007, 04:43
Nevermind, I got it working.
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22 Nov 2007, 04:43 |
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