Friday, December 29, 2023, 10:31:48, chinesejames1990 wrote:
Thanks. Umm should I fiddle with my programmer to see if I can make some adjustable supply voltage on the chip? ,_._,_
There is a lot of development programmers that have adjustable program and verify voltages (last one I used had it in programming method customization setup). But if programmer shows pin connection errors, first get a multimeter with a low voltage diode test mode and look if you can "see" ESD protection diodes between GND and VCC to each pin (maybe except Vpp). I had one plastic "windowless" one time programmable EPROM with a faulty pin wire welding, and it was successfully read in a cold state with a piece of ice in a small plastic bag on the top of chip.
It worth trying (carefully) to extract data from this EEPROM, because otherwise whole unit became a set of spare boards, and most of them without cal data.
