@BigBadBiologist Sorry, no I don't have a cache of BIOSs. A note for others. EPROMs are from that era when putting an IC in backwards and powering it up is pretty often death. The EPROM/IC may act like an SCR, turn on and short Vcc to Vss. Often if you can look in the quartz window of an EPROM you will see a blown bond wire which acted like a little fuse, typically centered on the wire. On the ends of the bond wire will be little balls of wire from the part that went molten.