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back2root:ibm-pc-ms-dos:interrupts:int_21:int_21_3f
Table des matières
INT 0x21 - 0x3f - Read From File or Device Using Handle
Request/Call:
| reg | value | descr |
|---|---|---|
| AH | 0x3f | |
| BX | file handle | |
| CX | number of bytes to read | |
| DS:DX | pointer to read buffer |
Return:
CF is cleared : success
| reg | descr |
|---|---|
| AX | number of bytes readed |
CF is set: error
| reg | descr |
|---|---|
| AX | error code (see DOS Error Code) |
Notes & Comments
- read specified number of bytes from file into buffer DS:DX
- when AX is not equal to CX then a partial read occurred due to end of file
- if AX is zero, no data was read, and EOF occurred before read
back2root/ibm-pc-ms-dos/interrupts/int_21/int_21_3f.txt · Dernière modification : de 127.0.0.1
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