I have seen this topic discussed but none of the previous answers helped.
I have a large number of old 2716 chips and need to program several. There are Intel, NEC, AMD and Fujitsu.
I went through and found some which were blank and threw others in an eraser.
I cannot program ANY of them, not even with an external 9 volt supply. They all fail on the first byte.
Furthermore, if I read non-blank ones I get weird data like all 00 or 00 with scattered 80 and A0 data. Reading then verifying fails consistently. So I can't even read properly.
Just yesterday I was successfully reading 2764 and 27256 devices.
What gives? My programmer is a GQ-4X which I bought directly from you.
Further info: I took a good National Semiconductor MM2716Q and read it using the GQ-4X. I then did a verify and it failed. It fails at different addresses on additional tries. I tried using the slower 0 and -2 settings and it didn't help.
Of the three EPROMs of this type I tested, two read mostly zeroes and the third shows data.
What is wrong with my unit? Why doesn't it work with 2716s? It can't even read them correctly or consistently.
If this unit cannot work with these chips can you recommend a unit which will?
Unable to work with 2716
Posted - 05/30/2026 : 15:15:49
