M27C160 EPROM Burner....

wolfievtec

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I'm at my wits end trying to figure out how to burn ROMs for my Exotica Board. They are M27C160 EPROMS. I have a Willem 5.0PCB with a 42 Pin adapter. I've been told that's probably my issue. (I guess these boards aren't good for burning these chips - I get a bad blank check everytime) Anyone have any ideas what would be a good burner for these chips? Thanks!
 
My TopMax by eeTools.com works wonders, but it's NOT cheap.
 
I'm at my wits end trying to figure out how to burn ROMs for my Exotica Board. They are M27C160 EPROMS. I have a Willem 5.0PCB with a 42 Pin adapter. I've been told that's probably my issue. (I guess these boards aren't good for burning these chips - I get a bad blank check everytime) Anyone have any ideas what would be a good burner for these chips? Thanks!


Do you have the ribbon cable installed to deal with the extra address lines,
did you set the jumper on the 42 pin adapter correct, did you set the dip correctly on the burner.
 
My adapter didn't come with a ribbon cable. It just has 3 red wires. Each go from A19,A20,A21 on the adapter to the main programmer. I have the dip switch set correctly for the M27C160 chips and the VPP jumper. See pictures. Thanks!
 

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My adapter didn't come with a ribbon cable. It just has 3 red wires. Each go from A19,A20,A21 on the adapter to the main programmer. I have the dip switch set correctly for the M27C160 chips and the VPP jumper. See pictures. Thanks!


How are you powering it, usb or AC
 
Its probably the Willem causing the problems, I have heard a lot of bad things about them being very very flaky, then again most Willems are not actually official Willems, just cheap knock-offs. Many people buy a Willem to save money only to bin it an buy a decent burner. I use a Wellon VP280, not particularly expensive but handles 27c400 with ease, along with every other eprom I have ever needed to read or write.
 
I never had problems burning 27C160s with my old (v3) Willem... I've upgraded to a GQ-4X (only for the USB), but I haven't tried it with that yet. I assume you've erased the chips w/ a UV eraser?

If you do a read several times in a row, does it always return the same values? Usually, if you do a blank check with no chip in, it'll pass... try that. A blank check is simply a read, so it sounds like either there's a problem with your circuitry (Data lines) and/or the EPROM (the VPP shouldn't matter yet, and if a chip is blank, your address lines won't matter). Do any other types of EPROMs work?

If you burn a file of all 0s (disable the automatic blank check before burning), then re-read it, you should get all 0s. Of course you'll then have to re-erase the chip, but that'd tell you a lot.

DogP
 
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