Coffee

I think I put this in the wrong category, sorry. Could it be moved? Thanks.

Hi everyone, I'm new here. I've got a situation where I can burn TMS2532JL eproms but not the HN462532G Hitachi counterparts. I'm using a Willem GQ-4X programmer and the write process appears to succeed but the chip is blank afterwords. I've tried it with and without an external power supply on the programmer and I've also re-erased the Eproms for 15-20 minutes, same deal. I was wondering if you all could offer some suggestions before I give up. I read that someone had success writing at a slightly higher voltage but my programmer doesn't seem to have that ability. Is the VPP just a constant voltage that I could make an adapter board to provide my own external VPP instead of using the programmer's? None of this is anything super critical, just tinkering, but it would be great if I could make use of these Hitachi Eproms I have. Thanks!