A3000 CyberstormSCSI and INT2-fix

phx · 26 January 2011, 16:07

After reassembling my A3000 with CSPPC all SCSI disks have become extremely slow (lots of timeouts, max. 1 MB/s). I fear that I might have damaged the INT2 wire, which I soldered to the bottom of the board many years ago.

Does anybody know from his own experience what happens when the Cyberstorm SCSI lacks the INT2-fix?

Jope · 26 January 2011, 21:09

The machine will crash/hang on bootup.

phx · 26 January 2011, 22:40

For the record: After disassembling the whole machine again I found my suspiscion confirmed. The INT2 wire on the CIA had become lose.

Now the speed is normal again. So it seems that the cybppc.device can even transfer data without interrupts. It will just use a very long timeout and then assume the data is ready.

Jope · 27 January 2011, 09:49

Ok.. I seem to remember that my CSMK2 didn't even boot up with the scsi module connected if the int2 line was missing.

26 January 2011, 16:07	#1
phx Natteravn Join Date: Nov 2009 Location: Herford / Germany Posts: 2,502	A3000 CyberstormSCSI and INT2-fix After reassembling my A3000 with CSPPC all SCSI disks have become extremely slow (lots of timeouts, max. 1 MB/s). I fear that I might have damaged the INT2 wire, which I soldered to the bottom of the board many years ago. Does anybody know from his own experience what happens when the Cyberstorm SCSI lacks the INT2-fix?

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26 January 2011, 21:09	#2
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,865	The machine will crash/hang on bootup.

26 January 2011, 22:40	#3
phx Natteravn Join Date: Nov 2009 Location: Herford / Germany Posts: 2,502	For the record: After disassembling the whole machine again I found my suspiscion confirmed. The INT2 wire on the CIA had become lose. Now the speed is normal again. So it seems that the cybppc.device can even transfer data without interrupts. It will just use a very long timeout and then assume the data is ready.

27 January 2011, 09:49	#4
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,865	Ok.. I seem to remember that my CSMK2 didn't even boot up with the scsi module connected if the int2 line was missing.

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