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Author Topic: A500Flash - new Kickstart switcher  (Read 2818 times)

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Offline psxphill

Re: A500Flash - new Kickstart switcher
« on: February 24, 2016, 09:06:14 AM »
Quote from: Oldsmobile_Mike;804543
Not counting the various "Romy" hacks that allow A3k and A4k to support 1MB.

There are similar hacks to get 1mb rom in an a500, AFAICT the extra 512k is mapped at the same address ($e00000 as on the a1200/a3000/a4000)

http://members.iinet.net.au/~davem2/overclock/A2000Kickstart.html

Apparently the cdtv memory card slot also appears at $e00000. If this board follows the same convention as other hacks, then I would expect problems on the cdtv.

Quote from: QuikSanz;804542
But won't a 1Meg chip eat into bus max? or is it not mapped that way.

It shouldn't eat into the 2mb chip, 8mb fast, 1.8mb trapdoor "ranger"/"slow" ram space.

However if a product like the http://wiki.icomp.de/wiki/ACA620#Memory came along that could map memory anywhere you wanted within the first 16mb then then you would have 512k ram less address space to put ram in. If you want a 1mb kickstart rom then it has to go somewhere.
« Last Edit: February 24, 2016, 09:16:51 AM by psxphill »