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Changing from F6 to F4 bank switching


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I have been working on my first 2600 game ROM and have already supported 4 x 4 Kbyte banks using the Atari F6 mapper with a Pixels Past ATARI Banking PCB and a PLC.

 

When I try to change up from F6 to F4 banking, I re-flash the PLC but my ROM file doesn't work on real hardware or the 2600+ (though it runs on Stella emulator with F4 settings).

 

My EPROM chips are 32Kbyte, so using F6 banking and duplicating my 16 KByte ROM feels like I'm throwing away 16K.

 

Any ideas of what I am doing wrong with the PLC or pixels past PCB?

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