RE: C128 Ram Banks 2 and 3
Date: 2001-02-22 08:59:41

Hi Marko,

>The way I did it was that I piggy-backed another MMU on top of the
>original one and added some glue logic that swapped some data pins on the
>second MMU (I think D6 and D7) when the memory configuration registers
>were addressed.  The RAM bank selection signals (those that are connected
>to -CAS on the RAM chips) from the new MMU were wired to RAM banks 2 and 3.

Thanks, I have seen your schematics for going all the way to 1Mb.

I assume then that there was never an official CBM way to make the expansion
even though they design protected signal names?


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