MCUmall EPROM BIOS Chip Burner Forum Active Users: / Visits Today:
Highest Active Users:
MCUmall EPROM BIOS Chip Burner Forum
Home | Profile | Register | Active Topics | Members | Search | FAQ
Username:
 Password:
Save Password
Forgot your Password?

 All Forums
 MCUmall Forums
 Novice Place
 Problems reading and writing with 27C256/27C512		  Forum Locked
 Printer Friendly
Author Previous Topic Topic Next Topic  

JuanAR155Q4

5 Posts
Posted - 05/21/2008 :  18:52:21  Show Profile
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
No one??
Go to Top of Page
Reply #2

DrFatz

4 Posts
Posted - 06/18/2008 :  06:47:24  Show Profile
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?
Go to Top of Page
Reply #3

DL

USA
46 Posts
Posted - 06/21/2008 :  05:50:44  Show Profile
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
Go to Top of Page
Reply #4

JuanAR155Q4

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

JuanAR155Q4

5 Posts
Posted - 09/22/2009 :  11:09:21  Show Profile

No one with this information?
Go to Top of Page
Reply #6

ZLM

2945 Posts
Posted - 09/22/2009 :  12:49:41  Show Profile
GQ-3X
Go to Top of Page
Reply #7

JuanAR155Q4

5 Posts
Posted - 12/10/2009 :  05:31:47  Show Profile
Thanks!!! Will try it!
Go to Top of Page
  Previous Topic Topic Next Topic  
 Forum Locked
 Printer Friendly
Jump To:
MCUmall EPROM BIOS Chip Burner Forum © Copyright 2003 - 2009 Mcumall Electronics Inc. Go To Top Of Page
Generated in 0.21 sec. Snitz Forums 2000