On Thursday 24 April 2014, you wrote: > On 04/24/2014 02:06 PM, David Wood wrote: > > http://oms.wmhost.com/misc/C64C_VSP-fix_theory.png 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. -- http://www.hitmen-console.org http://magicdisk.untergrund.net http://www.pokefinder.org http://ftp.pokefinder.org Wenn man nicht so gut schwimmen kann, sollte man einfach nicht so weit ins tiefe Wasser gehen. <Bob Marley> Message was sent through the cbm-hackers mailing listReceived on 2014-04-24 21:02:51
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