Bitfields for device attributes (block device) |
| Bit | Description |
|---|---|
|
15 |
clear (indicates block device) |
|
14 |
IOCTL supported |
|
13 |
non-IBM format |
|
12 |
network device (device is remote) |
|
11 |
(DOS 3.0+) OPEN/CLOSE/RemMedia calls supported |
|
10 |
reserved |
|
9 |
direct I/O not allowed??? (set by DOS 3.3 DRIVER.SYS for "new" drives) |
|
8 |
??? set by DOS 3.3 DRIVER.SYS for "new" drives |
|
7 |
(DOS 5.0+) Generic IOCTL check call supported (driver command 19h) (see AX=4410h,AX=4411h) |
|
6 |
(DOS 3.2+) Generic IOCTL call supported (driver command 13h) implies support for commands 17h and 18h (see AX=440Ch,AX=440Dh"DOS 3.2+",AX=440Eh,AX=440Fh) |
|
5 - 2 |
reserved |
|
1 |
driver supports 32-bit sector addressing (DOS 3.31+) |
|
0 |
reserved |
|
Note: |
For European MS-DOS 4.0, bit 11 also indicates that bits 8-6 contain a version code (000 = DOS 3.0,3.1; 001 = DOS 3.2; 010 = European DOS 4.0). |
|
See Also: |