Reply 20 of 43, by FAMICOMASTER
Inverting the "mode" switches, the computer no longer boots. No post beeps or anything. Putting them back to normal brings it back to life.
Pulling the "0WS" jumper and moving J4 "pen" from 1&2 to 2&3 got it to show up in TesX.
(I moved to another monitor to use my main monitor for another project)
The 2.5MB window now shows up. Changing all of the switches in bank 1 to off makes no difference, and changing all of the switches in bank 1 back, then all of bank 5's switches to off gives this: