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Copyright 1991 David Jurgens |
INT 21,40 - Write To File or Device Using Handle
AH = 40h
BX = file handle
CX = number of bytes to write, a zero value truncates/extends
the file to the current file position
DS:DX = pointer to write buffer
on return:
AX = number of bytes written if CF not set
= error code if CF set (see DOS ERROR CODES)
- if AX is not equal to CX on return, a partial write occurred
- this function can be used to truncate a file to the current
file position by writing zero bytes
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| Esc or Alt-X to exit |
int 21,40 |
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