INT 21 - DOS 2+ - IOCTL - SET DEVICE INFORMATION
|
Input |
DOS1 |
N |
DOS2 |
Y |
DOS4 |
Y |
DOS5 |
Y |
Output |
|
AX |
44h |
01h |
Error
Code |
AX |
|
BX |
File
Handle |
|
|
BX |
|
CX |
|
|
|
|
CX |
|
DX |
00h |
Device
Info |
|
|
DX |
|
ES:DI |
|
Set
if Error |
CF |
Can only be used to set info for Character Devices
| Device
Info for Character Devices |
| Bit |
Dec |
Hex |
Description |
| 0 |
1 |
0001h |
Standard Input Device |
| 1 |
2 |
0002h |
Standard Output Device |
| 2 |
4 |
0004h |
NUL Device |
| 3 |
8 |
0008h |
CLOCK$ Device |
| 4 |
16 |
0010h |
Special Device
(Supports INT 28h) |
| 5 |
32 |
0020h |
Binary (RAW) Mode |
| 6 |
64 |
0040h |
Not EOF for Input |
| 7 |
128 |
0080h |
1 |
| 8 |
256 |
0100h |
Reserved |
| 9 |
512 |
0200h |
| 10 |
1024 |
0400h |
| 11 |
2048 |
0800h |
| 12 |
4096 |
1000h |
Network Device |
| 13 |
8192 |
2000h |
Reserved |
| 14 |
16384 |
4000h |
Can process IOCTL
(Can't Set) |
| 15 |
32768 |
8000h |
Reserved |
|