Hi Rob, On 11/30/12 4:17 PM, Rob Clarke wrote: > In a nutshell, drive 1 works 100%, drive 0 will read and write but not format. > It usually stops on track 1 with a #21 read error but occasionally will go as > far as track 3 or 4. If I swap the mechanisms, the problem stays with drive1. > This implies a problem in the analogue board (micropolis pcb #8050006) 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. Regards, Mike -- Mike Naberezny (firstname.lastname@example.org) http://6502.org Message was sent through the cbm-hackers mailing listReceived on 2012-12-03 19:00:09
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