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I have two 27c010 eproms I want to dump before they die of bit-rot, but I have a few questions before I do.

I have a willem 5.0 programmer, and I'm not exactly sure how to set it up. I moved some jumpers around the last time I used it, and that was several months ago. If I have some jumpers in the wrong place, will that damage the eprom when I try to dump it? I think it's set to pcb 3.0 mode right now, and I think I know how to change it back, but I want to be %100 sure before I do. I think I also messed with the j12 (expand) jumpers the last time I used it. Does it matter how that is set?

I set the jumpers and dip switches the way the picture shows in the willem program. It's just the ones it doesn't show that I'm worried about.

Thanks!

What version of pcb5.0 do you have ?
Most important for eproms - Vcc=5V, Vpp=12.7 (if you look to program 27C010), 12 pos.DIP-switch, jumper left from dipswitch panel, and 2 jumper blocks right from ZIF panel. Voltage levels you can verify in Test H/W mode. jumpers and dipswitch panel - follow picture in sw.
Here is 2 paralel jumpers switching modes , pcb3b to work with SW 0.97ja, pcb45 mode to work with 0.98dx.

Thanks. It's PCB 5.0E. I tried dumping both chips, and the dumps from both chips were identical with the exception of one byte. Is that normal, or do you think I dumped them wrong?

Read chip and verify against first result (means 2x read is the same)