Z80s are alive and well in test equipment! Here I'm repairing a 5000V power supply that likes to kill itself. One of the recent failure modes shorted some 74 s

Z80s are alive and well in test equipment! Here I'm repairing a 5000V power supply that likes to kill itself. One of the recent failure modes shorted some 74 series logic and held down the data bus, causing it to spin through address space. https://www.eevblog.com/forum/testgear/ps350-5000v-power-supply/ https://www.eevblog.com/forum/testgear/ps350-5000v-power-sup... More impressively, other members set up emulators and reverse engineered the calibration routines: https://www.eevblog.com/forum/repair/quick-repair-standford-research-ps350-5kv-5ma-(fixed)/ https://www.eevblog.com/forum/repair/quick-repair-standford-...