Re: DD2 & 3

From: Ingo Korb <ml_at_akana.de>
Date: Tue, 18 Jun 2013 22:54:02 +0200
Message-ID: <ua9mnf8d1.fsf@dragon.akana.de>
Julian Perry <jp@digitaltapestries.com> writes:

> Jim Drew raised the issue that the 1541 board timing had a problem
> with fast SRAM, and that 120ns was about the fastest that worked
> without corruptions.
> ( http://www.lemon64.com/forum/viewtopic.php?t=41396 )

I suspect he is wrong about that and/or the control circuit for his RAM
was badly designed. Two of my 1541s (an older one with PCB 251830 and a
1541-II) have no problems accessing a 70ns 62256 SRAM chip.

-ik

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Received on 2013-06-18 21:00:08

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