On 2019-Feb-06, at 1:21 PM, Noel Chiappa via cctalk wrote:
From: Brent
Hilpert
what about the refresh circuitry of the memory
board?
...
It might also explain why a number of 4116s were (apparently) failing
earlier in the efforts ... replacing them might have just replaced them
with 'slightly better' chips, i.e. with a slightly longer refresh tolerance.
Ooh, excellent idea!
Is the schematic available for the memory board at-issue?
Curious myself to see what approach for refresh DEC used.