> Does anyone have a comprehensive memory map for the VCS? (including all
> the mirrors of various parts?) It would be really helpful, especially
> when doing in-cart hardware.
There are so many copies of the TIA registers, RAM and such that it would be
impractical to draw it out as a map. Hopefully you know what I mean by the
1000 bit, the 200 bit and the 80 bit in hex. These are the important
addressing bits.
If the 1000 bit is set then it is a ROM (cart) access. Otherwise it is
either a TIA, RIOT register or RAM access. The rules to decide which is
accessed are:
If the 200 bit is set and the 80 bit is set then it's a RIOT register
access.
If the 200 bit is not set and the 80 bit is set then it's a RAM access.
If the 200 bit is not set and the 80 bit is not set then it's a TIA access.
As a general rule, it's probably a good idea to only trigger in-cart
hardware if the 1000 bit is set.
John
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