Re: ROMs replacement

From: Kajtár Zsolt <*soci_at_c64.rulez.org*> Date: Tue, 09 Oct 2012 07:55:56 +0200 Message-ID: <5073BC6C.7080907@c64.rulez.org> · soci_at_c64.rulez.org

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>> http://dl.dropbox.com/u/58002657/cbm/c64/rom_adapter_0.png
> 
> Looks OK to me... Please check in your circuit if the direct connection
> of pin 13 of the LS00 and pin 3 of the LS11 to +5V is there

Does not look good to me. A12 is routed through 3 LS gates (from CHAROM)
while CE only on 1. I'm almost sure the address is changing _after_ the CE
was activated. Are you sure there are no hazads there? Using CHAROM twice on
different levels looks not so good. Try more delay for OE/CE as a workaround.

- -- 
						    -soci-
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