osFree wiki - en:docs:dos:api:int21:33

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Anonymous (anonymous@undisclosed.example.com) — 2024-05-02T05:30:32+00:00

Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=33H, AL=00H Version 2 and higher Brief Get current extended break state Family API Input AH = 33h AL = 00h Return DL = current state, 00h = off, 01h = on

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Anonymous (anonymous@undisclosed.example.com) — 2024-05-02T05:31:14+00:00

Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=33H, AL=01H Version 2 and higher Brief set state of extended Ctrl-C/Ctrl-Break checking Family API Input AH = 33h AL = 01h DL = new state 00h off, check only on character I/O functions 01h on, check on all DOS functions

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Anonymous (anonymous@undisclosed.example.com) — 2024-05-02T05:32:50+00:00

Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=33H, AL=02H Version 3.0 and higher Brief GET AND SET EXTENDED CONTROL-BREAK CHECKING STATE Family API Input AX = 3302h DL = new state (00h for OFF, 01h for ON)

03

Anonymous (anonymous@undisclosed.example.com) — 2024-05-02T05:34:57+00:00

Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=33H, AL=03H Version 3.4/4.0 Brief GET CURRENT CPSW STATE Family API Input AX = 3303h Return DL = current CPSW Macro Notes this function and AX=3304h were intended to support a proposed code-page switching flag (using the WORD at offset 0Ch in the DOS directory entry for codepage information); however, this function has always been a NOP in public releases of DOS and

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Anonymous (anonymous@undisclosed.example.com) — 2024-05-02T05:37:42+00:00

Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=33H, AL=04H Version 3.4/4.0 Brief SET CPSW STATE Family API Input AX = 3304h DL = new CPSW state Return nothing Macro Notes this function and AX=3303h were intended to support a proposed code-page switching flag (using the WORD at offset 0Ch in the DOS directory entry for codepage information); however, this function has always been a NOP in public releases of DOS and

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Anonymous (anonymous@undisclosed.example.com) — 2024-05-02T05:39:29+00:00

Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=33H, AL=05H Version 4.0 and higher Brief GET BOOT DRIVE Family API Input AX = 3305h Return DL = boot drive (1=A:,...) Macro Notes This function does not use any of the DOS-internal stacks and may thus be called at any time. It is directly dispatched from the INT 21h entry point with interrupts disabled.

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Anonymous (anonymous@undisclosed.example.com) — 2024-05-02T05:46:40+00:00

Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=33H, AL=06H Version 5.0 and higher Brief GET TRUE VERSION NUMBER Family API Input AX = 3306h Return BL = major version BH = minor version DL = revision (bits 2-0, all others 0) DH = version flags bit 3: DOS is in ROM bit 4: DOS is in HMA AL = FFh if true DOS version < 5.0