On Fri, 19 Mar 1999, Alex Wulms wrote:
> This mystery can be solved quite simply if you look at the specifications of
> the MSX slot. In a cartridge slot, you have three signals, just for the
> convenience of the hardware designer:
> CS1: This signal becomes active if the Z80 addresses memory in page 1
> CS2: This signal becomes active if the Z80 addresses memory in page 2
> CS12: This signal becomes active if the Z80 addresses memory in page 1 or 2
I already knew this signals, but I never understood how to create a ROM in
pages 0 and 3.
> As you might understand, the cartridges which are 'mirrored' all over the
> place simply ignore the CSx signals. While the megarom cartridges, which can
> only be addressed in page 1 and 2, use the CS12 signal.
Then, normal Konami Megaroms use CS12 signal, and Konami SCC Megaroms
don't use. Is that right?
> Funny to realize that all these amazing discoveries are well documented. We
> should definetely get a good site up and running with all technical
> documentation available about the MSX. It will save a lot of people a lot of
> time with tracing and disassembling the MSX ROMS.
Yes, it will save too much time!
But how can be made cartridges with 64kb of normal continuous RAM?
Greetings from Brazil!
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Marco Antonio Simon Dal Poz http://www.lsi.usp.br/~mdalpoz
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