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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: mingle on December 08, 2008, 06:52:00 AM
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Hi,
I have a rather annoying issue with an older (1992 vintage) SCSI CD-ROM drive and my Amiga 1200 (+ Blizzard 030/SCSI).
When I pop a disk in, it can see the disk fine and can read all the directories without any issues, the only problem is I can't load/read/run any of the files on the CD. I get an Amiga DOS error saying cannot open the tool/file or whatever I'm trying to use.
It's not an issue with the drive, as far as I can see, since it appears to be correctly connected and is visible in the SCSI Tools device list - and of course it reads the CDs fine...
The drive is an old 'flip-top' (ala-CD32) drive, an NEC CDR-25BJ.
I suspect it may be something to do with the AmiCDFS mountlist for the device, but I'm not sure what I need to change/try.
Here's the mountlist I'm currently using:
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* $VER: CD0 2.36 (22.08.96)
*
* CD-ROM filesystem mount entry
*/
Device = 1230scsi.device
Unit = 5
FileSystem = L:AmiCDFS
Flags = 0
BlocksPerTrack = 32
BlockSize = 2048
Reserved = 0
LowCyl = 0
HighCyl = 11000
Surfaces = 1
Buffers = 64
BufMemType = 1
Mask = 0x7fffffff
GlobVec = -1
Priority = 10
DosType = 0x43444653
StackSize = 600
Mount = 1
Control = "LC BL=8 FB=32"
/* Control field template:
*
* LC=LOWERCASE/S,CS=CASESENSE/S,
* HF=HFSFIRST/S,TD=TRACKDISK/S,
* BL=BUFFERLINES/K/N,FB=FILEBUFFERS/K/N,
* DC=DISKCHANGE/K/N,MT=MOTORTIME/K/N,
* SD=STARTDELAY/K/N,TDC=TDCHANGE/S,
* TOSHIBA/S,OLDMODE/S
*/
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... any thing else I should look at or try to change?
Cheers,
Mike.
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Add a line reading
MaxTransfer = 0x10000
above or below Mask. If it still does not work, add the word OLDMODE to the control string.
If disk changes are not recognised, you can also add the words DC=3 to the control string. This will cause it to poll every three seconds instead of using an interrupt.
Bye,
Thomas
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Hi Thomas,
Thanks for the info... I gave it a try, but it didn't make much difference.
However, I managed to get it working - I think it may have been a hardware issue after all!
I took the drive apart and put some more grease on the guide-rods for the read-head and when I put it back together it worked...
Very strange. Before I took it apart I experimented with what files it could actually read. It would do a file-search of the entire disk without any issues. It would also display any icons (.info files) without any issues. I could also get it do display a few text files. But most of the time it would start to read the file, then it sounded like it would 'choke' on the file and spin-down, then try to spin up again... and again... I thought perhaps the disk was 'slipping' on the spindle - since it wasn't held very firmly...
Anyway, it now works, altough since it's a 2x speed drive, it's pretty slow!
Thanks again for your suggestions!
Cheers,
Mike.