12 Oct
2004
12 Oct
'04
9:33 a.m.
Hi Tony,
My guess is that it's not talking properly to the
1793 disk controller
chip. I have had this chip fail :-(. But you might start by checking the
power supply (there's a second PSU board in disk units, mounted on the
side of the drive tower, which supplies the disk controller board and
drives). And then check and re-check that ribbon cable.
I have determined that it is indeed the 1793 disk controller chip ...
I borrowed one from another system, and as soon as I powered up, I heard
the floppy seek to track 0 - stuffed in a boot disk and it booted right
up...
I agree :-( .. I don't have a spare 1793.
Does anyone have an extra Western Digital 1793 (or compatible) FDC
kicking around? Bare on on a board (I've got a good desoldering
station) ???
Regards,
Dave
--
dave04a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Vintage computing equipment collector.
http://www.parse.com/~ddunfield/museum/index.html