AMSTRAD cpc 6128 User Instruction page 342

AMSDOS
error DERR value Cause of error
0
o
or 22
[ESC] has been pressed.
14 1 42 (128+ 14)
The stream is not in a suitable state.
15
1 43 (128+ 15)
Hard end of file has been reached.
16 144 (128+ 16)
Bad command, usually an incorrect
filename.
17
145 (128+ 17)
File already exists.
18
1 46 (128+ 18)
File does not exist.
19 1 47 (128+ 19) Directory is full.
20 148 (128+20) Disc is full.
21 149 (128+21) Disc changed while files were open.
22 150 (128+22) File is Read/Only.
26
1 5 4 (128+ 26)
Soft end of file has been detected.
If AMSDOS has already reported an error, then bit 7 is set; hence the value of D ERR
is offset by 128.
Other values returned by D ERR originate from the disc controller and are bit
significant, always with bit 6 set. Bit 7 indicates whether the error has been reported
by AMSDOS (as explained above). The significance of each bit is as follows:
Bit Significance
o
Address mark missing.
1 Not writable - disc is write protected.
2 No data - can't find the sector.
3 Drive not ready - no disc in the drive.
4 Overrun error.
5 Data error - CRC error.
6 Always set to 1 to indicate error from disc controller.
7 Set to 1 if error has already been reported by AMSDOS.
For your reference .... Chapter 7 Page 31