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 True USB Willem Programmer (GQ-2X,3X,4X & GQ-4x4)
 how to set SST27SF512 with a GQ-4X programmer?		  New Topic  Reply to Topic
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electricdream

Italy
5 Posts
Posted - 11/13/2013 :  09:27:31  Show Profile  Reply with Quote
Hi.

I have to repair a C=64 cartridge (Cpitan Niki II) and the damaged eprom is 27c256.

I'm not sure what file I have to transfer, but almost certainly is this:

https://www.dropbox.com/s/x5z09qw4j1fs00f/Captain_Miky_II_NIKI2_Rename.bin

and it is a 32k binary (I think was dumped from a 27c256 epr).

My eprom is a sst27sf512 re-writtable, and it is a 64k epr.

How should I set this eprom with GQ-4x programmer? (possibly without soldering jumping from one pin to another!)

Software is GQ-4XUSBPrg.

Thanks.
Reply #1

electricdream

Italy
5 Posts
Posted - 11/21/2013 :  03:32:04  Show Profile  Reply with Quote
Nobody can help me?
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Reply #2

ZLM

2945 Posts
Posted - 11/23/2013 :  16:16:27  Show Profile  Reply with Quote
There should be no any setting needed.

It should be a drop-in replacement.

You just need to select sst27sf512 from software and write the data file. You need to erase the 27SF512 and do blank chck before write it.
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Reply #3

electricdream

Italy
5 Posts
Posted - 12/05/2013 :  01:40:20  Show Profile  Reply with Quote
Many thanks. So at least I know that sst27sf512 is not compatible for my purpose. I need a 27c256 epr. But is there 27C256 epr "rewritable" for Willem GQ-4X programmer?
Edited by - electricdream on 12/05/2013 01:43:02
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Reply #4

ZLM

2945 Posts
Posted - 12/11/2013 :  00:44:45  Show Profile  Reply with Quote
27C256 is a rewritable chip. It is EPROM. You need a UV eraser to erase it before write new data.
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