Leo, the programming voltage on 2716 sucks, especialy older EPROM models like NEC, that's why most programmers can't support them. Has anybody here ever successfully programmed their 2716s? It works a treat but I want to re-flash now cleanly erased 2716 at some point in the future. What's so special about 2716s? So far I have used 27C256 in place of 2716 with a classic hack of putting it into a socket with top 4 pins hanging lose and connected to +5V. Anyway after a lot of swearing I went online to find a cheap-ish EPROM programmer to be able to flash the 2716 ICs but it looks like a lot of programmers start support from 2732, e.g. Works fine with 27C64, 27C256, etc though. I have a Chinese piece of sh!t programmer called TOP2004 that is supposed to support them but nada! It does not write them, only pretends to: I have looked at pins on the scope and it does not even pulse the -PGM pin or increments address bus pins. I have re-written some firmware for R6502 and INS8070 CPUs in an old spectrum/network analyser It all went well up until I tried to program original UV-eraseable EPROMs NEC D2716.
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