dhinson919 Posted October 7, 2018 Share Posted October 7, 2018 Does anyone know if an Atmel AT28C64B can drop-in replace a 2732 EPROM, assuming appropriate pin rerouting? The datasheet says the I/O pins are TTL compatible. Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted January 13, 2019 Share Posted January 13, 2019 28C64 (same as 27C64) is not drop in/pin compatible with 27C32. It also has 4 more pins that would hang off the end of the socket. It can be made to work with appropriate pin rerouting, or an adapter board to remap some of the pins, and optionally use the extra address line as a bank select, to choose which 4KB half of the 28C64 is in use. (Or duplicate the image twice if you leave it floating) Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted January 13, 2019 Share Posted January 13, 2019 You could also check whether or not the board has an easy modification for the EEPROM chip. Several of the vintage systems do. Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted March 3, 2019 Share Posted March 3, 2019 Actually, you may be interested in this versatile 'universal' adapter: http://www.arcade-cabinets.com/board_hacks/24U/index.shtml "The 24U is a universal replacement solution to replace 2708, 2716 and 2732s EPROMS. This kit is a very small adapter board that can take a cheap and easy to find 28 pin EPROM (27512, 27256, 27128, 2764) and can use it to replace a 2708, 2716 or 2732" Quote Link to comment Share on other sites More sharing options...
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