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Copyright 1991 David Jurgens |
INT 21,44,4 / IOCTL,4 - Read from Block Device
AH = 44h
AL = 04
BL = drive number (0=default, 1=A:, 2=B:, 3=C:, ...)
CX = number of bytes to read
DS:DX = pointer to data buffer
on return
AX = number of bytes read if CF clear
= error code if CF set (see DOS ERROR CODES)
- block drivers are not required to support this function
- returns AX = 01 (invalid function code) if not supported
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| Esc or Alt-X to exit |
int 21,44,4 |
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