Willem Programmer not reading EPROM correctly

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Willem Programmer not reading EPROM correctly

Post by Creebo » Thu Apr 19, 2012 6:23 pm

I just got my EPROM eraser today after a long three weeks, so I figured I could start using some EPROMs for projects. Well I went to test my programmer by throwing a EPROM in it that I took off of a MAME board. I did a read on it, and instead of what I thought would look like data (this is from a main game EPROM) is just a bunch of lines of either 00 or 10.

So I thought, okay, well I'll erase a chip and see what happens. So I stick one in the toaster for 15 minutes or so and then I do a read, but I get nothing but 90 repeated. I'm assuming the programmer isn't reading it right.

I've tried about 8 EPROMs, half of the are 27c512's and the others are 27c010. I know all of them worked less than 6 months ago. If anyone had some insight, I'd love to hear it!

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