MCUmall EPROM BIOS Chip Burner Forum
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 Problems reading and writing with 27C256/27C512
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JuanAR155Q4

5 Posts

Posted - 05/21/2008 :  18:52:21  Show Profile  Reply with Quote
Hi,
I have a similar programmer:


I have had it for a couple of years, and it's a long time I'd use it.
When I recently bought it, I wrote a couple of 27c256 and worked perfectly.
Now I wanted to write some 27c256 and I can't even read them. In the buffer section all is 00.

I have checked in the Test H/W section Vcc (4.65V) and Vpp (12.47V).
Also tried to read some 27c512 and the same thing.

Couldn't find a similar problem in the forum and thats why I'm posting.
Hope someone can help me.
Reply #1

JuanAR155Q4

5 Posts

Posted - 05/26/2008 :  19:01:37  Show Profile  Reply with Quote
No one??
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Reply #2

DrFatz

4 Posts

Posted - 06/18/2008 :  06:47:24  Show Profile  Reply with Quote
I have the same problem with my 27C256B. I read it just fine, the software says the EPROM is okay and everything is good, yet I get all 00 in the buffer. Did you ever manage to resolve this?
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Reply #3

DL

USA
46 Posts

Posted - 06/21/2008 :  05:50:44  Show Profile  Reply with Quote
Hi,

Your programmer isn't suitable for programming any EPROMs. VCC needs to be 6.0-6.25V to program any EPROM larger than 32Kb. That programmer has several design flaws. You can read about them at http://www.willem.org/cgi-bin/yabb22/YaBB.pl?num=1145286403

Your programmer will draw about 300mA from the USB port and can damage your port. The programmer isn't USB compliant and should only draw 100mA max from the port. I thought it was the step-up regulator that was the problem, but PCB3 designs don't draw excessive current; so it's something specific to the enhanced universal design.

USB power shouldn't be used for programming EPROMs anyway...

HTH,
Dennis
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Reply #4

JuanAR155Q4

5 Posts

Posted - 12/03/2008 :  18:11:03  Show Profile  Reply with Quote
Denis,
Wich one do you recomend for a newbie that just want to burn 27c256 and 27c512?
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Reply #5

JuanAR155Q4

5 Posts

Posted - 09/22/2009 :  11:09:21  Show Profile  Reply with Quote

No one with this information?

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Reply #6

ZLM

2937 Posts

Posted - 09/22/2009 :  12:49:41  Show Profile  Reply with Quote
GQ-3X
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Reply #7

JuanAR155Q4

5 Posts

Posted - 12/10/2009 :  05:31:47  Show Profile  Reply with Quote
Thanks!!! Will try it!
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