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vgallardo
Mexico
6 Posts |
 Posted - 02/08/2006 : 20:14:13
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Im trying to program an eprom m27c801 but i keep getting errors,
error at 0x000000 chip = 0xFF buffer= 0x00
this is for a PBX, their incomunicated so you can imagine how important it is for me to get it to work again.
This is what i have to work with: 4-- m27c801 two used two new, one uv eprom eraser, one dual power willem universal programer and about 6 or 8 hours to get it working again.
can anybody please ..please please.. please please please please
help.
i cannot get the programer to work
victor m gallardo
tijuana B.C. Mexico |
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| Reply #1
ZLM
2945 Posts |
Posted - 02/08/2006 : 21:17:10
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Please check all the jumper settings. Espacilly on J3, which is just left side of DIP switch. It should be no jumper on it. The jumper is sert on the P1-A19 of JP-1.
For the jumper setting please see:
http://www.mcumall.com/forum/topic.asp?TOPIC_ID=106 |
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| Reply #2
vgallardo
Mexico
6 Posts |
Posted - 02/08/2006 : 21:56:01
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done that and no luck ...the jumpers are fine i cant seem to program the eprom
victor m gallardo
tijuana B.C. Mexico |
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| Reply #3
vgallardo
Mexico
6 Posts |
Posted - 02/08/2006 : 22:00:56
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when programin should i enable the option "skip write 0xFF"?
victor m gallardo
tijuana B.C. Mexico |
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| Reply #4
vgallardo
Mexico
6 Posts |
Posted - 02/08/2006 : 22:04:52
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im using a 12v ac adapter 1000ma, is that ok?
im using the parallel cable.
victor m gallardo
tijuana B.C. Mexico |
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| Reply #5
vgallardo
Mexico
6 Posts |
Posted - 02/08/2006 : 22:21:10
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i meant 12v dc 1amp
victor m gallardo
tijuana B.C. Mexico |
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| Reply #6
ZLM
2945 Posts |
Posted - 02/10/2006 : 22:40:17
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1. "skip write 0xFF" doesn't matter.
2. 12V DC 1amp power adapter more than enough.
3. Please try to increase the tWp to maximume.
4. Remove the chip, and in Test H/W page, check the Vpp-1 check box, and then check if there is a 12.7V Vpp on pin 24 of ZIF. |
Edited by - ZLM on 02/10/2006 22:43:38 |
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| Reply #7
chaos89-dot-com
7 Posts |
Posted - 04/01/2006 : 22:45:56
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If your refering to measuring the voltage on VPP, would that would be pin 1 of the ZIF socket. I measured voltage on pin 24 when programming and I am only getting 12.25VDC
I measured the voltage on pin 1 of zif and I am only getting 12.49VDC
Not 12.7VDC
How do we up the power to program these eproms without using the 15 voltage setting?
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Edited by - chaos89-dot-com on 04/01/2006 23:54:26 |
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My ass is on the line ..can somebody please help
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