> Hi Rob, > > You might want to read an article called "Help for 8050 Speed Problems" in > the > June 1991 issue of Northwest Computer News. You can download it here: > > http://6502.org/documents/publications/nw_computer_news/ > > It describes the operation of the tach circuit and suggests a few > component > replacements to improve its reliability. Thanks Mike - that's a very interesting article. Although the speed checks out good using C='s own disk tools, it's the only problem that appears to match my symptoms. I successfully wrote several full disks worth of data last night and verified it back, so normal writing of files works perfectly, it's just the formatting that fails. I also *found* my other 8050 which had been missing for the last month and swapped in a known good analogue board and it worked 100%, so I know the problem is on there somewhere. My biggest problem is the lack of a working scope at the moment. I've been prevaricating over the expense for the last few months but I've just been offered a working Tektronix 465B which I've decided to buy. Maybe I wil have more success with that. I have a laser tachometer on it's way to me which I'll use to externally verify the RPM. Cheers, Rob Message was sent through the cbm-hackers mailing listReceived on 2012-12-04 11:00:10
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