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back2root:ibm-pc-ms-dos:interrupts:int_21:int_21_34
Différences
Ci-dessous, les différences entre deux révisions de la page.
| Prochaine révision | Révision précédente | ||
| back2root:ibm-pc-ms-dos:interrupts:int_21_34 [2023/01/08 11:45] – créée frater | back2root:ibm-pc-ms-dos:interrupts:int_21:int_21_34 [2024/04/08 08:23] (Version actuelle) – ↷ Liens modifiés en raison d'un déplacement. 23.22.35.162 | ||
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| Ligne 22: | Ligne 22: | ||
| <WRAP round box> | <WRAP round box> | ||
| * AKA the INDOS flag, this critical section flag may be checked from within an interrupt handler before requesting a DOS service. It is a semaphore that is non-zero when DOS is busy, and zero otherwise. | * AKA the INDOS flag, this critical section flag may be checked from within an interrupt handler before requesting a DOS service. It is a semaphore that is non-zero when DOS is busy, and zero otherwise. | ||
| - | * though this flag indicates whether a DOS interrupt is active, it should not be used alone to determine DOS is safe for re-entry; Here's the standard rule for safe DOS entry: if INT 28 is active or this flag and the critical error flag are clear then it is safe to call DOS | + | * though this flag indicates whether a DOS interrupt is active, it should not be used alone to determine DOS is safe for re-entry; Here's the standard rule for safe DOS entry: if [[back2root: |
| * this interrupt should be used only during TSR initialization; | * this interrupt should be used only during TSR initialization; | ||
| - | * this flag is cleared after a critical error (INT 24) | + | * this flag is cleared after a critical error ([[back2root: |
| * ES:BX-1 points to the critical error flag for DOS 3.x+ | * ES:BX-1 points to the critical error flag for DOS 3.x+ | ||
| * ES:BX+1 points to the critical error flag for DOS 2.x | * ES:BX+1 points to the critical error flag for DOS 2.x | ||
| * ES:BX-1AA points to the critical error flag for COMPAQ DOS 3.0 | * ES:BX-1AA points to the critical error flag for COMPAQ DOS 3.0 | ||
| - | INT 21,5D in DOS 3.x+ can be used to locate the critical error flag</ | + | INT [[back2root: |
| + | [[start|Back]] | ||
back2root/ibm-pc-ms-dos/interrupts/int_21/int_21_34.txt · Dernière modification : 2024/04/08 08:23 de 23.22.35.162
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