MCUmall EPROM BIOS Chip Burner Forum
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 True USB Willem Programmer (GQ-2X, GQ-3X, GQ-4X)
 GQ-4X DS-1220Y Read and Programming Issues

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Krankshaft Posted - 09/25/2015 : 13:22:52
I'm here to report an issue I've discovered using the GQ-4X when attempting to both read and write a Dallas DS-1220Y battery backed SRAM. A device supported by the programmer.

When I attempt to read the device code appears in the buffer however it doesn't reflect what is actually in the SRAM.

If I attempt to test the programmers ability to modify the SRAM by changing some hex values in the buffer. It attempts to program the device (the progress bar makes it to 100%) but it fails to verify it afterward. The contents of the SRAM are unchanged from the initial read.

When I place the same chip in a TL866 it reads the chip properly and I can also alter the contents of the SRAM and get it to verify. So this isn't an issue with the SRAM.

Upon comparing the hex files from the GQ and the TL866 they don't match. Since the GQ can't write to the SRAM I can't really trust what it's read either.

Just something to look into.

Thanks For Your Time.
5   L A T E S T    R E P L I E S    (Newest First)
ZLM Posted - 09/30/2015 : 14:40:13
Please write to for a RMA code.
Krankshaft Posted - 09/28/2015 : 09:45:58
I just tried a 27C256 EPROM made sure it was blank all 1s and filled it with 0s and it verified fine.

I'd be glad to send the chip for testing just let me know where to mail it.
ZLM Posted - 09/26/2015 : 22:31:18
The 12F508 is not a good testing chip. It is a serial programming chip. You need a parallel programming chip.

Yes. Try 27C256.

If you can program 27C256 without problem, then the software may need a fine tun on DS1220. The best way is to send your chip to MCUmall for software fix.
Krankshaft Posted - 09/26/2015 : 05:32:12
I just tried it with a PIC12F508 and was able to write a hex file to it and it verified so the programmer does work with other chips.

But when I attempted to write to the DS1220 it again failed to verify. It completes the write process fine it just doesn't verify.

I have some 27C256 EPROMs that it was able to program in the past if you'd like me to try those?
ZLM Posted - 09/25/2015 : 22:41:56
Tested with my GQ-4X and it works fine.

Test the programmer with other chips and see if it works.

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