MCUmall EPROM BIOS Chip Burner Forum
MCUmall EPROM BIOS Chip Burner Forum
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 True USB Willem Programmer (GQ-2X,3X,4X & GQ-4x4)
 TMS 87C257-20JL

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T O P I C    R E V I E W
magloman Posted - 04/14/2011 : 01:05:04
Hi,

I have just recieved a batch of used eprom 87c257 and i cannot program them using my GQ-4X fw 1.30
USB driver 2.0

Used software 4.01 at first, then downloaded the newest 6.12 and no difference.

Always hangs if I try to write pass adress B0

If I only write within that area it works fine.

Made a new device line inside devices.txt but i cannot alter the WVPP to other values because the software then complains when I start it.

my own made device:
Name="TMS87C257",ID="97C2",Class="87C257",Category="EPROM",MFG="TI",RVPP="5V",WVPP="12v",WVCC="5v";


Datasheet here:
h**p://dl.dropbox.com/u/15772069/TMS87C257.pdf
1   L A T E S T    R E P L I E S    (Newest First)
magloman Posted - 04/14/2011 : 02:20:09
tried with my old GQ-3x with software 3 and external 12v supply. it works very well

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