CZroe Posted May 10, 2017 Share Posted May 10, 2017 (edited) My copy of Ms. Pac-Man has a bad ROM chip. Any instructions for making a functional copy of this from an original Ms. Pac-Man board? What better use for a dead copy of Ms. Pac-Man (looks minty too). Edited May 10, 2017 by CZroe Quote Link to comment Share on other sites More sharing options...
tep392 Posted May 11, 2017 Author Share Posted May 11, 2017 My copy of Ms. Pac-Man has a bad ROM chip. Any instructions for making a functional copy of this from an original Ms. Pac-Man board? What better use for a dead copy of Ms. Pac-Man (looks minty too). This should tell you everything you need to know. http://www.digitpress.com/library/techdocs/7800_Eprom_cart.pdf Quote Link to comment Share on other sites More sharing options...
CZroe Posted May 11, 2017 Share Posted May 11, 2017 This should tell you everything you need to know. http://www.digitpress.com/library/techdocs/7800_Eprom_cart.pdf Thanks, but is it the same for 5200? If I can just drop an EPROM in there (assuming it's pin-compatible) I guess I'd need to know how to split the ROM image and which to burn to what chip. Quote Link to comment Share on other sites More sharing options...
tep392 Posted May 11, 2017 Author Share Posted May 11, 2017 Sorry, I had 7800 on the brain, but it should be a similar mod for the 5200 cart. Quote Link to comment Share on other sites More sharing options...
tep392 Posted May 11, 2017 Author Share Posted May 11, 2017 I just remembered that the 5200 uses a two chip cart for the 32k games. How you wire it will depend if you use 2x 16k eproms or 1x 32k eprom. Quote Link to comment Share on other sites More sharing options...
CZroe Posted May 11, 2017 Share Posted May 11, 2017 (edited) I just remembered that the 5200 uses a two chip cart for the 32k games. How you wire it will depend if you use 2x 16k eproms or 1x 32k eprom. If I go with dual 16k I assume I just need to use two sets of the inverter's inputs and outputs. I'm going to guess that I need to route both enable/select lines into the same inverter input and connect the output to the 32k EEPROM if I go with 32k, correct? Edit: or just wire it to be always enabled? Edited May 11, 2017 by CZroe Quote Link to comment Share on other sites More sharing options...
tep392 Posted May 11, 2017 Author Share Posted May 11, 2017 I'm looking at a 5200 cart schematic and it looks like the chip selects are active low. If true the you should be able to use two 16k eproms without any inverters. Quote Link to comment Share on other sites More sharing options...
CZroe Posted May 11, 2017 Share Posted May 11, 2017 (edited) I'm looking at a 5200 cart schematic and it looks like the chip selects are active low. If true the you should be able to use two 16k eproms without any inverters. Sounds like EEPROMs are a drop-in replacement then. Nice! I'm sure one of my Ms. Pac-Man ROMs is still working because I doubt both failed (one is AMI-produced and the other is NCR-produced) so I can dump it to compare to see how the ROM image should be split (compare to a downloaded Ms. Pac-Man ROM). Also, the Atari logo still shows up with the name of the game so one of the ROMs is almost definitely working. Thanks again! Edited May 11, 2017 by CZroe Quote Link to comment Share on other sites More sharing options...
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