Daver2 it's like genius lamp!!!I think you are being somewhat optimistic Dave !
can i have one more little help please?
Good to see this resolvedNo great ideas from me yet but I'm watching this thread very closely as I have just picked up an 8050 (and a working 8032) with seemingly with the same current problem - drive powers up, passes internal self test but does not carry our commands from the PET. Status light seems to flicker with command comms but goes into a red fail state for each command. The drive heads don't seem to be moving on mine.
Need to get my other 8050 (was working) from storage to compare the two - and probably swap parts to narrow the problem down on this 'new' one.
Won't distract from this current investigation unless I have a light bulb moment for you....please carry on !
Good work. Did you have any problem finding new 3446 chips?In the case of my 8050 problem - it turned out to be the pair of MC3446 bus transceivers responsible for the IEEE interface
Er, yes - they are pretty thin on the ground and expensive so I 'borrowed' a couple from a knackered donor board in my junk pile to test with.Good work. Did you have any problem finding new 3446 chips?
Good going, these chips are getting hard to find. I am hanging on to a few spares.Er, yes - they are pretty thin on the ground and expensive so I 'borrowed' a couple from a knackered donor board in my junk pile to test with.