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| back2root:ibm-pc-ms-dos:interrupts:int_09:start [2024/04/06 18:39] – supprimée - modification externe (Date inconnue) 127.0.0.1 | back2root:ibm-pc-ms-dos:interrupts:int_09:start [2025/07/22 21:52] (Version actuelle) – [Related interrupts] frater | ||
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| + | ====== Int 09h - Keyboard Interrupt (Hardware Handler) ====== | ||
| + | |||
| + | <WRAP round info > | ||
| + | no input data | ||
| + | </ | ||
| + | |||
| + | ===== Related memory ===== | ||
| + | |||
| + | {{tablelayout? | ||
| + | | 40:17 | updates keyboard flag byte 0 | | ||
| + | | 40:18 | updates keyboard flag byte 1 | | ||
| + | | 40:1A | queue head ptr is set to buffer start if Ctrl-Break is hit | | ||
| + | | 40:1C | updates buffer tail pointer for each keystroke; sets queue tail ptr is set to queue start if Ctrl-Break is hit | | ||
| + | |  40:1E   | updates keyboard buffer (32 bytes) | ||
| + | | 40:71 | updates bit 7 of the BIOS break flag if Ctrl-Break is hit | | ||
| + | |  40:72   | updates reset flag with 1234H if Ctrl-Alt-Del pressed | ||
| + | |  40:96   | indicates keyboard type (AT, | ||
| + | |  40:97   | updates keyboard LED flags (AT, | ||
| + | |  FFFF: | ||
| + | |||
| + | ===== Related interrupts ===== | ||
| + | |||
| + | {{tablelayout? | ||
| + | ^  reg  ^ | ||
| + | |[[..: | ||
| + | |[[..: | ||
| + | |[[back2root: | ||
| + | |[[back2root: | ||
| + | |||
| + | ===== Notes & Comments ===== | ||
| + | |||
| + | <WRAP round box> | ||
| + | * records key press and key release via IRQ1/8259 and stores scan codes in the BIOS buffer located at 40:1C | ||
| + | * keyboard controllers also buffer data when interrupts are disabled at the [[back2root: | ||
| + | * keyboard controller is capable of storing 16 keystrokes even when interrupts are disabled at the [[back2root: | ||
| + | * normal INT 9 execution takes approximately 500 microseconds; | ||
| + | </ | ||
| + | |||
| + | see [[back2root: | ||
| + | |||
| + | [[..: | ||