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Slothie · 1st Jun 2020, 6:45 pm

Yes, I've missed out connecting NRDS to the ~OE pin on the 6116. I'll recommend that as write only memory is of limited use!
A PROM would probably work as NRDS & NWDS are active for ~750ns at 4mhz which given the 74S571 has a 35ns access time (presumably others would be similar) and with a reasonably fast RAM is plenty of time. Would be neater too.

1st Jun 2020, 6:45 pm	#15
Slothie Octode Join Date: Apr 2018 Location: Newbury, Berkshire, UK. Posts: 1,287	Re: MK14 memory upgrade Yes, I've missed out connecting NRDS to the ~OE pin on the 6116. I'll recommend that as write only memory is of limited use! A PROM would probably work as NRDS & NWDS are active for ~750ns at 4mhz which given the 74S571 has a 35ns access time (presumably others would be similar) and with a reasonably fast RAM is plenty of time. Would be neater too.