MCUmall EPROM BIOS Chip Burner Forum
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 Open Source Project Willem Programmer Hardware
 M27C256B problems with enhanced willem
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paulinho

Portugal
3 Posts

Posted - 09/22/2006 :  17:26:15  Show Profile  Reply with Quote
Hi...
I just bought one of this programmers and it reads 27c256 eproms ,but it canīt burn them, cause it gives an error and just writes the first byte.

Can anyone help me?
Reply #1

ZLM

2936 Posts

Posted - 09/25/2006 :  15:55:30  Show Profile  Reply with Quote
Please provide exact error message.
Also, the chip need to be erased and pass the blank check before write new data.
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Reply #2

paulinho

Portugal
3 Posts

Posted - 09/26/2006 :  11:21:05  Show Profile  Reply with Quote
Thanks for the help,
But iīve bought 10 and all of them pass the blank check sucessfully (2 separate suppliers).

The error is "Error at 0x000000 Chip=0x8A Buffer=0xAA"
Read all chips.

Edited by - paulinho on 09/26/2006 12:28:44
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Reply #3

ZLM

2936 Posts

Posted - 09/26/2006 :  15:46:22  Show Profile  Reply with Quote
It seems you need adjust the tWp and tWc parameter.
Increse those two parameters.
Also, try to select 27256 from the software instead of 27C256. This will give more tWp and tWc room for adjusting.

Also, try to write more than once if first write attempt failed.
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Reply #4

paulinho

Portugal
3 Posts

Posted - 09/27/2006 :  04:52:54  Show Profile  Reply with Quote
Iīve done that now and it gives me the same problem.
Canīt make it doing any recording
What can i do now?

Thanks for the help - again
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Reply #5

Murf928

USA
1 Posts

Posted - 09/27/2006 :  14:12:11  Show Profile  Reply with Quote
I am having the same problem.

Mine reads: Error at 0x000000 Chip = 0xFF buffer = 0x81

Any ideas?

Porsche 928 Supercharger Systems
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Reply #6

DL

USA
46 Posts

Posted - 09/28/2006 :  13:35:09  Show Profile  Reply with Quote
quote:
Originally posted by paulinhoThe error is "Error at 0x000000 Chip=0x8A Buffer=0xAA"
This error means too many bits are being programmed in the EPROM. Changing programming timings is not likely to help.
0x8A = 0100 1010
0xAA = 1010 1010

The high nibble of the first address isn't being programmed correctly.

Do you get exactly the same error for all EPROMs?

HTH,
Dennis
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Reply #7

DL

USA
46 Posts

Posted - 09/28/2006 :  13:36:42  Show Profile  Reply with Quote
quote:
Originally posted by Murf928

I am having the same problem.

Mine reads: Error at 0x000000 Chip = 0xFF buffer = 0x81
Your problem is different. The EPROM isn't programming. What programmer do you have, what is the complete part number from your EPROM? What is VPP set to? Have you verified that VPP is correct?

HTH,
Dennis
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