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Peter G
2 Posts |
 Posted - 05/30/2026 : 15:15:49
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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. |
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| Reply #1
Peter G
2 Posts |
Posted - 05/30/2026 : 18:11:29
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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?
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| Reply #2
K17
USA
4 Posts |
Posted - 09/12/2026 : 11:09:08
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Hi Peter,
I had to program a 2716 EPROM for my Black Knight pinball back in 2018. Here are my notes:
- First chip I did - refused to work although it reported that it programmed fine.
- Next attempt was programmed at the slowest speed possible (-2) and with the external power plugged in, and it worked (and has been working for the last 8 years).
Note: I have three 9V power supplies, all of them were within spec (>200mA), however, only the one that was rated at 500mA would cause the "ON" LED to actually turn on (when not plugged into the USB port).
I am about to burn another 2716 for an arcade machine. I will report back on how that went.
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Michel K-17 |
Edited by - K17 on 09/12/2026 11:29:14 |
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Unable to work with 2716
