Thread: Mk14 vdu
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Old 7th Nov 2020, 8:44 pm   #831
Timbucus
Octode
 
Join Date: Mar 2019
Location: Barry, Vale of Glamorgan, Wales, UK.
Posts: 1,362
Default Re: Mk14 vdu

Quote:
Originally Posted by Mark1960 View Post
Quote:
Originally Posted by Timbucus View Post
OK I tried 47pF caps (fitted more neatly on the top as I had tried one of them on A10) on A8,9 and 10 and I also seem to be able to run all software with no observable errors, and despite two cups and four biscuits no reverse C. Reassuringly switching back in the 10K pullup on NWDS and the corruption re-appears. This works both with and without the RAM expansion.

I don't have 3off of anything lower and as they were fiddly to fit I think they will be staying.
I think 47pF sounds much more reasonable than 100pF on the high address lines.

Just wanted to clarify.
You have 47 pF only on A8, A9 and A10, nothing on A11.
Do you have 4.7k on NWDS?
Yes exactly that.
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