MCUmall EPROM BIOS Chip Burner Forum
MCUmall EPROM BIOS Chip Burner Forum
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 Using The Enhanced/Dual power Willem Programmer
 Unable to burn 27cxxx
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1 Posts

Posted - 09/22/2005 :  05:30:03  Show Profile  Reply with Quote
I got the enhanced USB powered programmer.

I can read and verify all my eeproms (27c64,27c256 and 27c512) but by the time I try to write them (yes they are empty and all check out with the blank test) I get an error after the first bit. Sometimes they seem to program and fail at the last bit but the chips are still empty after the "programming".

yes, I've tried all the different setting in my BIOS and on 3 different PCs.

I am out of ideas here....
Reply #1


23 Posts

Posted - 09/23/2005 :  09:52:36  Show Profile  Reply with Quote
i think your (& my) programer does NOT support those chips
br, ales
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Reply #2


138 Posts

Posted - 09/27/2005 :  14:39:00  Show Profile  Reply with Quote
Read and then Verify a chip does not means the programmer been working correctly. That because the software does not verify the hardware jumper/DIP setting before read/verify.

You still need check following points:

-Chip's location and orientation in ZIF.
-DIP switch setting.
-Blank check chip before doing write.
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Reply #3


United Kingdom
4 Posts

Posted - 10/19/2005 :  07:49:31  Show Profile  Reply with Quote
I purchased one of these (PRG 001) April 2005,and have been well pleased with it,it does burn 27xx series as per instructions provided with the kit.

1.Verify the eprom is empty,leaving it in the UV eraser a longer time(i found the erase times differ from even the same manufacture even brand new)if after one time if does not verify empty.
2.Remove the jumper above the ZIF socket and press once the button to the right of the jumper,this sets the voltage to 15v.The 27xx is 12v proram.
Now you are ready to program.
When finished,replace the jumper(You will see the 15v led go off and the left led go on(the jumper is a safety feature and resets the voltage so as to not damage flash eeprom's)
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