The GQ-4X blank checks the entire chip. I've had plenty of chips I thought I fully erased fail a blank check in the higher address ranges, gone in and read those address locations and saw data.

I think you meant 2532 here Chris.

This is the first thing to try. Next try a different USB port then after that a different computer. If that doesn't work try blowing out the ZIF socket with compressed air. You can open up the programmer and try reseating the ZIF socket to the board. You may also have a bad set of EPROMs that won't program. Lastly, there may also be a bug in the config for the chip - check it in the devices.txt file. I've seen this before as well.

viperrwk

For many devices (not all), blank checking also uses Vpp voltage (program verify) which the read does not. I've never had a device which blank checked ok on a GQ-4X that I couldn't program correctly and always go by the blank check - I never bother reading the device after blank checking.

If you've had devices that blank checked ok but could still read data, you should report it to MCU Mall since that would be a bug. It could be a device compatibility issue or a programmer fault (they do go bad, even new ones) since that should never happen. They are very responsive to technical requests.

viperrwk

Which would be a device compatibility issue - problem with the programming algorithm, config, etc.

[email protected] - I'll bet they'll respond if you email them the details of the problem.

What was the device? Lots of people use this programmer and if it has a bug with this device it would be good to know.

viperrwk

You *could* replace a 2716 with a 28C16 for example:

ebay.com link: 28C16 15 EEprom

But given the higher price and the relatively short data retention compared to an EPROM why would you? The only reason would be if you were writing your own code and trying it out in a machine and needed to erase and reprogram frequently.

viperrwk