MCUmall EPROM BIOS Chip Burner Forum
MCUmall EPROM BIOS Chip Burner Forum
Home | Profile | Register | Active Topics | Members | Search | FAQ
Save Password
Forgot your Password?

 All Forums
 MCUmall Forums
 TOP USB Programmer
 HELP : 27C1000 programming on TOP2048

Note: You must be registered in order to post a reply.
To register, click here. Registration is FREE!

Format Mode:
Format: BoldItalicizedUnderlineStrikethrough Align LeftCenteredAlign Right Horizontal Rule Insert HyperlinkInsert EmailInsert Image Insert CodeInsert QuoteInsert List Spell Checker

* Forum Code is ON
Smile [:)] Big Smile [:D] Cool [8D] Blush [:I]
Tongue [:P] Evil [):] Wink [;)] Clown [:o)]
Black Eye [B)] Eight Ball [8] Frown [:(] Shy [8)]
Shocked [:0] Angry [:(!] Dead [xx(] Sleepy [|)]
Kisses [:X] Approve [^] Disapprove [V] Question [?]

   Insert an Image File
Check here to include your profile signature.

T O P I C    R E V I E W
caius Posted - 12/31/2007 : 10:51:56
Hi all,
I have a TOP2048 USB programmer, I'm trying to program a Fujitsu 27C1000 EPROM.The blank check is good (I also erased the EPROM under ultraviolet light) but when I try to program it, Topwinen (v.2.52) returns this error:

000000:Error! (file=08,chip=ff)

I check the current voltage on pin 1 (VPP) and , when the programming starts, it raises for a while from 3.90 Volt to 9.90 (but sometimes also to 5 or 6 volt).
Programming other EPROM type (27512,2764,27128) is fine, so what colud be the cause of this problem with 27c1000 EPROM)
I hope someone can help me.
Thanks in advance and Happy New Year!
9   L A T E S T    R E P L I E S    (Newest First)
ZLM Posted - 01/02/2008 : 11:05:06
if you can program 27128, then the Vpp circuit is fine. Only for 27C1000 Vpp controller is broken. I do not have schamatic, it is never published.
caius Posted - 01/02/2008 : 02:19:02
Originally posted by ZLM

If you can not program all EPROMs, then your programmer 12V circuit is stopped working. It needs repair.

Thanks.Do you know where can I put my hand?Is there any schematics of the pcb? I would be glad if you could help me in some way.

Update: I try to program a 27128 where the VPP is 21V and it was succesful, so the conclusion is that I cannot program EPROM that require 12V.
ZLM Posted - 01/01/2008 : 20:52:00
If you can not program all EPROMs, then your programmer 12V circuit is stopped working. It needs repair.
caius Posted - 01/01/2008 : 11:12:04
Yes, you are right.
I did all you have told me, the conclusion is that I can read all EPROMs (I also tried with a 27128) but when I try to program blank EPROMS (I erase myself them with UV eraser) I obtain the same error :

000000:Error! (file=1st value on the buffer,chip=ff).

So, what can I do?Is the programmer bad? Some weeks ago it worked fine...So, it lose the 12V VPP?
ZLM Posted - 01/01/2008 : 10:03:57
1. read a not empty EPROM. So the buffer should not be all "FF".
2. verify the chip with current data buffer. If the chip is verified OK, then the programmer read should be stable.
3. do not remove the chip and just program the chip. If the chip can be programmed correctly, but not program on blank chip, then programmer may lost 12V VPP.
eln_70 Posted - 01/01/2008 : 09:03:56
After programming a memory cell of an EPROM, the programmer verifies (for each memory position of the chip) that the EPROM contains the same value as the buffer/file. If a programmer completely fails to write to a specific memory cell, it will still read as FF so assuming that programming is successful after writing a buffer filled with FF is not a safe assumption.

The programming _may_ have been successful but there is no way to know for sure since a blank memory cell is represented by the value FF. To be sure, the buffer needs to contain other values than FF.
caius Posted - 01/01/2008 : 06:01:57
Update: if i read the blank 27c1000 EPROM , I obtain a buffer filled with all "ff" value (obviously because the chip is empy) and, if I program the EPROM with this buffer, the programming is succesful.So , I assume, the problem is the file I'm trying to program, it's a file from an arcade PCB
caius Posted - 01/01/2008 : 02:24:14
The EPROM should be good, it passes the blanck check..besides I try also with another EPROM and I obtain the same error:

000000:Error! (file=08,chip=ff)

But , in your knowledge, what does it mean this error? What does it mean "file=08"? "chip=ff" should mean the EPROM is blank, right?
ZLM Posted - 12/31/2007 : 19:44:49
9.9V is too low to progam the EPROM.
Also, check your chip if it is damaged.

MCUmall EPROM BIOS Chip Burner Forum © Copyright 2003 - 2009 Mcumall Electronics Inc. Go To Top Of Page
Generated in 0.05 sec. Snitz Forums 2000