From: Marko Mäkelä (marko.makela_at_hut.fi)
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 Marko Message was sent through the cbm-hackers mailing list
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