Posted By
IstvanV
on 2007-12-10
09:23:04
|  1541 address decoding
Does anyone know how this is actually implemented in the real hardware ? According to the schematics, there seems to be RAM at $0000-$07FF, 6522 registers at $1800-$1FFF, and nothing is connected to $0800-$17FF. This 8K area is repeated 4 times until $8000, from where the 16K ROM is repeated twice. However, in YAPE, there is RAM at $0800-$0FFF as well, and nothing at $2000-$7FFF. Until now, I used the latter version too (not having the hardware, I assumed that it would be correct), but in plus4emu 1.2.5 I made changes to use the layout guessed from the schematics. While this is probably not an important detail, it is easy to emulate correctly if I know what the correct memory map is.
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But probably you are right after a quick check on schematics.
