Re: 'Frankenstein' Disk Drives, Done Cheap

From: Groepaz <>
Date: Thu, 24 Apr 2014 22:51:16 +0200
Message-Id: <>
On Thursday 24 April 2014, you wrote:
> On 04/24/2014 02:06 PM, David Wood wrote:
> > seems to be the
> > trick.  I was linked this via IRC.  It doesn't actively search for the
> > party, but instead latches the DRAM address before the VicII has a
> > chance to change its mind.
> I see what it does... If I understand it right that trick will only work
> since _CAS on the C64 has to go through the PLA. If _CAS were directly
> connected to the DRAMs, it would fail since the additional delay of the
> 74xx86 and the 74xx573 would cause the DRAMs to miss their column address.
> Did someone figure out what exactly happens inside VIC when this problem
> surfaces?

according to jens schönfeld its a setup-and-hold timing violation.


Wenn man nicht so gut schwimmen kann, sollte man einfach nicht so weit ins 
tiefe Wasser gehen. 
<Bob Marley>

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Received on 2014-04-24 21:02:51

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