Int 21 - Function 44h - I/O Control for Devices (IOCTL) Get or Set Device Information
Sub-Function Description ----------------- ------------------------------------------------------------- Int\21f\44sf\00 Get Device Information (from DX) Int\21f\44sf\01 Set Device Information (DH must be zero for this call) Int\21f\44sf\02 Read CX bytes to device in DS:DX from BX control chan Int\21f\44sf\03 Write Device Control String Int\21f\44sf\04 Read From Block Device (drive number in BL) Int\21f\44sf\05 Write to Block Device (drive number in BL) Int\21f\44sf\06 Get Input Handle Status Int\21f\44sf\07 Get Output Handle Status Int\21f\44sf\08 Removable Media Bit (DOS 3.x+) Int\21f\44sf\09 Test whether Local or Network Device in BL (DOS 3.x+) Int\21f\44sf\0A Is Handle in BX Local or Remote? (DOS 3.x+) Int\21f\44sf\0B Change Sharing Retry Count to DX (default=3),(DOS 3.x+) Int\21f\44sf\0C General device IOCTL (DOS 3.3 [3.2?]) Int\21f\44sf\0D Block Device Request (DOS 3.3+) Int\21f\44sf\0E Get Logical Device (DOS 3.3+) Int\21f\44sf\0F Set Logical Device (DOS 3.3+)
| file: /Techref/INT/21f/44.htm, 1KB, , updated: 2004/5/28 14:59, local time: 2024/12/17 21:20,
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Ashley Roll has put together a really nice little unit here. Leave off the MAX232 and keep these handy for the few times you need true RS232! |
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