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Amiga.org Amiga computer related discussion Amiga Marketplace Wanted: GVP A530 "GURU ROM"

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Old 04-10-2008, 04:01 PM   #16
totoche27
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Default Re: Wanted: GVP A530 "GURU ROM"

try this.

if 0x2000=< address =< 0x201F A14= A1

this means if the adress read in in the range, A14 will take the same value as A2

if you have a look on a rom dump, you will see that the data from 0x0000 are the same as the one from 0x4000 (look to be a rom switch.. at A14)

moreother if you have a look on winuae (GPL) source code that emulate the guru rom, you will see something like this (I replace some variable by the right value)

if (addr >= 0x2000) {
if (rom) {
int off = addr & rom_mask;
if ( (addr & 0xffe0) == 0x2000) __________ from 0x2000 to 0x201F
rombank = (addr & 0x02) >> 1; _________ A14=A1
off += rombank * rom_size;

I didn't hack any gal, just read the GPL source code...

up to now, I didn't try, so may needs some tweak . but I desperate to find a guru rom adapter to buy. IF I can't find I will do it myself as a lot of people had tried to ask . the Best should be for the autor to put the gal as a shareware. al lot of people who want to use this rom are honnest and will be very pleased to pay a shareware licence. (will do for sure)

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