+Larry Posted April 5, 2007 Share Posted April 5, 2007 Is anyone aware of a SIMM upgrade PCB made for an A8? Or for that matter, a PCB for a 1-MB (DIP) upgrade similar to the no-longer-available Newell 800XL & 130XE upgrades. -Larry Quote Link to comment Share on other sites More sharing options...
Wrathchild Posted April 5, 2007 Share Posted April 5, 2007 http://www.atari.sk/satantronic/1MBRAM_SMMMU/ though you need the GAL to achieve it. Quote Link to comment Share on other sites More sharing options...
JamesD Posted April 6, 2007 Share Posted April 6, 2007 (edited) http://www.atari.sk/satantronic/1MBRAM_SMMMU/ though you need the GAL to achieve it. It could probably be done without the GAL. Edited April 6, 2007 by JamesD Quote Link to comment Share on other sites More sharing options...
Sikor Posted April 6, 2007 Share Posted April 6, 2007 http://hardware.atari8.info/simm.php Quote Link to comment Share on other sites More sharing options...
+Larry Posted April 6, 2007 Author Share Posted April 6, 2007 Thanks for the links and info! -Larry Quote Link to comment Share on other sites More sharing options...
Mathy Posted April 6, 2007 Share Posted April 6, 2007 Howdy Larry if you don't need a PCB, you might wanna look here (look for a familiar name) for a schematic and some docs (far from finished) and here for an article. Greetings Mathy Quote Link to comment Share on other sites More sharing options...
Rybags Posted April 6, 2007 Share Posted April 6, 2007 (edited) Does it use any additional hardware besides the SIMM and wiring? Edited April 6, 2007 by Rybags Quote Link to comment Share on other sites More sharing options...
Mathy Posted April 6, 2007 Share Posted April 6, 2007 (edited) Howdy Rybags Mine does. Check out the schematics which you can find via first link I mentioned above. But everything should be easy to get at your local electronics store (except maybe for the SIMM-socket. My upgrade: - only uses $D301 - doesn't loose software control over BASIC, Selftest, OS ROM/RAM and if you have an XEGS Missile Command - doesn't loose separate access for ANTIC and CPU - allows you to use all of the above with all of the memory (except when used with switch, see next line. But it'll still have separate access for ANTIC and CPU) - it does seem to have problems with OSS carts (sloppy programming by OSS) but this can be cured by adding a switch. - it's tested and working on my XEGS. Don't use it with a computer with a mexican CPU. greetings Mathy Edited April 6, 2007 by Mathy Quote Link to comment Share on other sites More sharing options...
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