I wrote: >> I proposed it, and was willing to build microcontroller-based boards >> and write firmware, but IIRC it was decided that there was too little >> benefit.
On Thu, Jul 23, 2015 at 12:00 PM, William Donzelli <wdonze...@gmail.com> wrote: > That seems odd, considering the lengths you guys took on the caps, and > the whole museum mentality of keeping things "safe" for the artifacts. There's no artifact safety issue for the PDP-1 power supplies. They use a ferroresonant transformer, rectifiers, and filter capacitors. If any of those fail, the machine won't work properly, but it won't be damaged. If there had been voltage regulators, the failure of which could have resulted in serious overvoltage, we probably would have added crowbar circuits. In the Type 30 display, it's possible, though rather unlikely, for a failure in the deflection power supply to blow the deflection drive transistors. Adding a microcontroller isn't likely to avoid that. A crowbar circuit might be useful, though the damage happens so quickly that the deflection transistors might still fail.
