Hi Guys,
Blew the serial port on both of my TI85's. The zener
on my serial convertor shorted and feed +/- 12 volts to the 85's
serial port. Have checked all the diodes and transistors in
the 85's level shifting amp, before the CPU serial lines.
Got any ideas on how or where to go from here. Please don't
tell me to go TI, those guys are no help.
M.A. Keller