Re: Galaxian Memory MAP

You could always hack at that Galaxian 'test rom' that MacMan came up with
last year. I've tried it and it kind-of works...

http://www.ionpool.net/arcade/tech/galaxian_test_rom.zip

tm

Greg Baumgratz wrote:

> Anyone taken the time to do this yet or is it already documented
> somewhere? Couldn't find it last night, so what better to do on a cold
> snowy evening but analyze schematics? Anyway, here's what I found so
> far - any documentation to add or corrections to sleepy analyzations?
>
> ROM space
> 7U:$0000-$07FF
> 7V:$0800-$0FFF
> 7W:$1000-$17FF
> 7Y:$1800-$1FFF
> 7Z:$2000-$27FF
>
> Fluke 9010a checksum values by ROM
> 7U: FFDE
> 7V: 4055
> 7W: FCD2
> 7Y: 1241
> 7Z: 44E1
>
> RAM @ 7P and 7N
> 1KX8 total space 7P lower four bits (D0-D3), 7N upper four bits (D4-D7)
> $4000-$43FF
>
> RAM@ 3H AND 3F (Video RAM)
> 1KX8 total space, 3H lower four bits (D0-D3), 3F upper four bits (D4-D7)
>
> $5000-$53FF
>
> RAM@ 4F AND 5F (Object RAM)
> 256X8 total space, 4F lower four bits (D0-D3), 5F upper four bits
> (D4-D7)
> $5800-$58FF
>
> I think there are more RAM locations (the board location fails me right
> now) and I havn't looked for sound and dip locations. Can anyone add to
> this?
>
> Thanks,
> Greg
Received on Wed Nov 27 08:32:16 2002