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PostPosted: Mon Jun 18, 2018 4:46 pm 
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Joined: Mon Jul 02, 2012 7:46 am
Posts: 766
I wonder if it might be possible to reduce the wiring by just disconnecting the high address line from the Cx4 and feeding that directly into the ROM chip (so the Cx4 thinks it's always within the 16Mbit memory space and doesn't tri-state the data lines).


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PostPosted: Tue Jun 19, 2018 8:19 am 
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Joined: Wed Oct 21, 2015 4:26 pm
Posts: 11
Haven't tried that but it did cross my mind. This was the easier theory to test, because of those data line test points. If that works, a 1-rom solution is easy too. If not, easiest way would probably be to design a custom board and transplant a cx4..


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