So - none has a S8000... at home? ;)
I'm missing a backplane so I tried at first hooking up power on my CPU
module and connecting a serial interface to the tty1 (console) pins of
the bus-connector.... powering on the system makes the cpu getting a bit
warm but my console is quiet :( I'm not sure if I've to connect some
other pins as well with +5V or GND. NMI... RESET whatever... so I
wonder if someone has a S8000 at hand and can measure some things?
Old computers with serial port? Take a look at the 1488 and 1489 chips,
they have to be supplied with +12 and -12 tensions. Don't forget old RAM
memories who uses -5 volts...