Re: Action Replay - Ram Expansion

From: Marko Mäkelä (
Date: 2003-08-19 21:48:49

On Tue, Aug 19, 2003 at 03:16:01PM +0200, Laze Ristoski wrote:
> I understood that the AR has 8KB built-in RAM.
> How can I access it?

You can access it via $8000-$9fff, once you have configured the bank selection
register at $de00 appropriately.  The register is write-only; if it's read,
it will be written with whatever happens to be on the data bus.  The bits
are as follows:

7 - unused, or extra ROM bank selector (A15)
6 - Resets FREEZE-mode (turns back to normal mode)
5 - 1=enable RAM at ROML ($8000) & I/O2 ($DF00, =$9F00-$9FFF)
4 - ROM bank selector high (A14)
3 - ROM bank selector low (A13)
2 - 1=disable cartridge (turn off the $de00 register)
1 - 1=-EXROM high
0 - 1=-GAME low


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