| T O P I C R E V I E W |
| JuanAR155Q4 |
Posted - 05/21/2008 : 18:52:21
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. |
| 7 L A T E S T R E P L I E S (Newest First) |
| JuanAR155Q4 |
Posted - 12/10/2009 : 05:31:47
Thanks!!! Will try it! |
| ZLM |
Posted - 09/22/2009 : 12:49:41
GQ-3X |
| JuanAR155Q4 |
Posted - 09/22/2009 : 11:09:21
No one with this information?
|
| JuanAR155Q4 |
Posted - 12/03/2008 : 18:11:03
Denis,
Wich one do you recomend for a newbie that just want to burn 27c256 and 27c512? |
| DL |
Posted - 06/21/2008 : 05:50:44
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... |
| DrFatz |
Posted - 06/18/2008 : 06:47:24
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? |
| JuanAR155Q4 |
Posted - 05/26/2008 : 19:01:37
No one??  |
