Hallo Per, I can add at least one simplification to your design. RAM doesn't care what addresspin is connected to which addressline. For example: if you swap A0 and A1 and write something to address $xxx1, it will end up in $xxx2 inside the RAM. But reading from $xxx1 will read it from $xxx2 inside the RAM again. With other words: the outside world doesn't see the difference. The reason you cannot use this trick with ROMs (like replacing a 2364 with a 2764) is obvious: you cannot use ROMs programmed by people using the the original pinouts. The simplification is 1) connect RAM-pin 23 (A11) to ROM-pin 21 (A12) 2) connect RAM-pin 2 (A12) to ROM-pin 18 (A11) Groetjes, Ruud - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
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