Re: DD2 & 3

From: Ingo Korb <>
Date: Tue, 18 Jun 2013 22:54:02 +0200
Message-ID: <>
Julian Perry <> 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.
> ( )

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.


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

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