TRS80 mod 4 ver1 video/memory problems

From: Jim Davis <jpdavis_at_gorge.net>
Date: Thu May 29 17:37:00 2003

Hi,
I recently picked up a model 4 ver 1 with a problem. The system originally
worked and booted, after moving the system it started to display random
characters
on power up and failed to boot.. I removed socketed ICs and cleaned
the connectors.
The system now displays a blank screen on power up ( although the drives
spin, and
it could be booting ). If I disconnect the FD controller from the main
board, the
system jumps into basic ( with video ) and seems to operate. Print
fre(0) returns
somthing over 48K with the fd disconnected. Any hints?
Jim Davis.
Received on Thu May 29 2003 - 17:37:00 BST