|
| |
| Device
Driver Status Field |
| Bit |
Dec |
Hex |
Description |
| 0 |
1 |
0001h |
Error
message return code (with bit 15=1) |
| 1 |
2 |
0002h |
| 2 |
4 |
0004h |
| 3 |
8 |
0008h |
| 4 |
16 |
0010h |
| 5 |
32 |
0020h |
| 6 |
64 |
0040h |
| 7 |
128 |
0080h |
| 8 |
256 |
0100h |
DONE |
| 9 |
512 |
0200h |
BUSY |
| 10 |
1024 |
0400h |
Reserved |
| 11 |
2048 |
0800h |
| 12 |
4096 |
1000h |
| 13 |
8192 |
2000h |
| 14 |
16384 |
4000h |
| 15 |
32768 |
8000h |
Error |
The status word field is zero on entry and is set by the driver
interrupt routine on return.
BIT 15 is the error bit. If this bit is set, the low 8 bits of
the status word (7-0) indicate the error code.
BITS 14-10 are reserved.
BIT 9 is the busy bit. It is only set by status calls and the
removable media call. See "STATUS" and "REMOVABLE
MEDIA" in this chapter for more information about the
calls.
BIT 8 is the done bit. If it is set, it means the operation
is complete. The driver sets the bit to 1 when it
exits.
The low 8 bits of the status word define an error message if bit
15 is set. These errors are:
00h Write protect violation
01h Unknown unit
02h Device not ready
03h Unknown command
04h CRC error
05h Bad drive request structure length
06h seek error
07h unknown media
08h sector not found
09h printer out of paper
0Ah write fault
0Bh read fault
0Ch general failure
0Dh reserved
0Eh reserved
0Fh invalid disk change |