MCUmall EPROM BIOS Chip Burner Forum
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 TOP USB Programmer
 Reading a programmed tms27c020
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vidiot

Canada
4 Posts

Posted - 09/21/2005 :  21:37:40  Show Profile  Reply with Quote
I have a new top2005 programmer and I'm having problems reading the eproms.

I have pre-programmed tms27c020 chips but when I go to read them the programmer reads then as FF on the entire chip.

Is there something I'm missing? Or do I have a defective unit?

T

Edited by - vidiot on 09/22/2005 05:16:36
Reply #1

vidiot

Canada
4 Posts

Posted - 11/21/2005 :  14:26:35  Show Profile  Reply with Quote
Update:
Turns out that my unit was bad, They quickly repaired the unit and sent it back.

Now I can read the tms27c020 chip fine. I'm having problems writing the data back on to another chip "AM27C020 1200C" I verify that the chip is blank, It starts to write then gives an error. I tried slower speeds aswell.

Your help would be appreciated.

T
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Reply #2

vidiot

Canada
4 Posts

Posted - 11/22/2005 :  18:53:29  Show Profile  Reply with Quote
Well my repaired Programmer read eproms fine but does not write. I have tried changing the speed and it doesn't fix it. I have tried other computers same problem.

Anything I have missed?

T
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Reply #3

usb

138 Posts

Posted - 11/25/2005 :  08:34:16  Show Profile  Reply with Quote
Check the USB current level. It should be at least at level 5 or above. By the way, where you send the programmer and repaired? You may need to contactv them again.
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Reply #4

vidiot

Canada
4 Posts

Posted - 11/26/2005 :  07:21:42  Show Profile  Reply with Quote
The current level is 6. I've also tested it on another computer with the same problem. I sent it back to the guy I bought it from on ebay.

Also I noticed that there is no setting for a HN27C4096.
Is this a software limitation or hardware?

T
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Reply #5

usb

138 Posts

Posted - 11/28/2005 :  14:41:04  Show Profile  Reply with Quote
The TOP2005 does not support 16 bit EPROMs, such as 27C1024,27C4096. It is hardware limitation.
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