Trying to figure out this EPROM burning thing...

[jdgabbard]

Oh the joy of not understanding what you're doing...

 

Ok, so here is where I'm at. I have one of the black Fetzner boards. I have it populated with all of the components, sockets, and a seated 74LS379. The only thing that is different is that I used a 10nf cap as opposed to a 1nf cap. I seriously doubt capacitance is of major concern here, it's essentially decoupling the LS379 from what I can tell. I do have both the 2.2k resistors in plave.

 

The burner I'm using is a PCB50, which was hell to get working on win7. I am having a few issues with my blank checks returning false negatives. It'll say it is t blank when in fact it is. The EPROMs I'm attempting to use are M27C512s, and I get an programming error when attempting to use the 27C512, but using the 27512 option they program and verify fine.

 

But here is the problem. I've decided I don't know as much about the way this works as I thought. I've tried the 64k roms from the hexbus site. It works, but only has one option. Some chicken game... Even with the two (optional?)swutches wired it apparently only reads that one bank.

 

And the further complicate my position, I've tried several other 64k carts that were in a thread on the forum, and none of those worked.

 

Anyone care draw this out in crayons for me?

[+Ksarul]

I don't have a lot of time right now--but it is possible you have a 379 that isn't starting in the first or last bank (that happens occasionally). Contact me privately and I'll help you work your way through this (and give you the troubleshooting tools you need).

[jdgabbard]

Thanks Ksarul, it's possible I suppose. I'll shoot you a message when I get to the office.