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The 1K Pullup (sounds like an exercise challenge doesn’t it)

July 3, 2017

At the suggestion of the designer (Lee Hart) I added a 1K pullup resistor to the /A15 circuit on the Membership card.  That tightened up the timing dramatically.  The A15 and /A15 which enable the RAM and ROM respectively are now just about identical at 2 uS.

17-07-03 yayThe dumper program works and i can move on to de-scrambling the address lines.

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