Difference between revisions of "Talk:CPC GX4000-Multi EPROM Cartridge"

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ACID is not matched. "shoudn't be that difficult to reverse engineer the ACID chip". Sorry, it is more complex than you think, the ACID and ASIC talk to each other all the time and if the ACID doesn't reply, the ASIC blocks read access to ram. already the Spanish forum found this. It somehow blocks the read of any ram from z80 if it isn't copied 100%. But if you can help, please visit the forum and post there. Arnoldemu
 
ACID is not matched. "shoudn't be that difficult to reverse engineer the ACID chip". Sorry, it is more complex than you think, the ACID and ASIC talk to each other all the time and if the ACID doesn't reply, the ASIC blocks read access to ram. already the Spanish forum found this. It somehow blocks the read of any ram from z80 if it isn't copied 100%. But if you can help, please visit the forum and post there. Arnoldemu
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Interesting. Like I said, I don't have the hardware yet anyway. But if I do get them, it might be possible to match the ASIC requests to the ACID replies and program a PIC to emulate the ACID. Bryce

Revision as of 08:59, 23 October 2009

Is this official? When was it made? By whom?

Please, more details... it's rather useless as it is! Gryzor

It is possible to build such a cartridge. You can just remove the EPROM and replace it with a socket where you can put in your own EPROMs. I already built such a cartridge, too and it works perfectly, but I used a Flash EPROM instead of a normal EPROM, but this needs rewirings because the pins are not compatible. -Octoate 21:30, 22 October 2009 (UTC)

Hope you don't mind, just cleaned up the grammar a little... Bryce. And it seems to be Orphaned (no link to this page) as far as I can see.

I added a link in the Peripherals page. Nevertheless, I still don't understand quite this little thing does... how does it allow to easily modify ROM software? Puzzled... Gryzor 06:30, 23 October 2009 (UTC)


I added a link to a site with such mod...yet less professionnally executed...lol. Is it true there is a stock of 500 ACID chip somewhere ? If so, we may have a look on the cost of a production of such Cartridge... Every one should have one, No ? Thi would be better than to cannibalize existing cartridges.

Also it seem some stuff are written in Spanish on this, we should ask the spanish CPC community ? MacDeath

If the ACID isn't matched to the program on the ROM (which it doesn't seem to be, otherwise this device wouldn't work) then it shouldn't be that difficult to reverse engineer the ACID chip and replace it with a low-cost PIC. Unfortunately I have neither a CPC Plus nor a GX4000 nor a cartridge, but if I happen to acquire them at some time, I might make this my next project. Bryce

ACID is not matched. "shoudn't be that difficult to reverse engineer the ACID chip". Sorry, it is more complex than you think, the ACID and ASIC talk to each other all the time and if the ACID doesn't reply, the ASIC blocks read access to ram. already the Spanish forum found this. It somehow blocks the read of any ram from z80 if it isn't copied 100%. But if you can help, please visit the forum and post there. Arnoldemu

Interesting. Like I said, I don't have the hardware yet anyway. But if I do get them, it might be possible to match the ASIC requests to the ACID replies and program a PIC to emulate the ACID. Bryce

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