While my Model 3 and one Model 4 are stock configuration machines, the one with the failed CPU from the previous post is definitely not.
I got it through the New Zealand Trade and Exchange newspaper in the late 90's and was staggered when I went over to pick it up because it was the machine that Bill Porter (the owner of Porterfield Computers... the Radio Shack agents) used for all his software development and I think subsequently sold to Basic Payrolls in Newmarket who did a lot of bureau payroll processing using TRS-80's in the late 80's.
I worked for Porterfield Computers as a holiday job in 1985/86 so had used the machine regularly.
It was very distinctive because the internal drives had been replaced with 2 x 80 track (Mitsubishi) and 2 x 40 track (Tandon TM-50).
The machine was a US domestic model, imported before the 240v model was available and modified for 240v power.
The power supplies are after market Astec units and there are a number of mods to the main board and floppy controller.
The machine had been sitting in pieces in the workshop for the last 4 years and I finally felt sufficiently guilty to sort it out.
Given that it is not intended to be stock configuration and inspired by Ian Mavric's "Building the Super Micro" article I replaced the floppy drives with two internal 3.5" 720kb units in the bottom bay which makes software transfer from a PC a bit easier. I plan to connect one of the TM-50's externally so I can easily write disks for the other machines. A full height hard drive frame fills the top bay and I may install an "SD Card" and interface board the emulates a Radio Shack hard drive.
At some point in it's life this machine had lost the spectrastrip cable that connected the serial interface board with the main board. As a 20 pin connector these are easy to replace with a 20 pin header and old IDE hard drive cables.
Serial interface board with spectrastrip header removed
Serial Interface board with spectrastrip connector replaced by 20 pin SIL header
Serial interface board with modified IDE hard drive cable for connection to the main board
Main board with spectrastrip header replaced by 20 pin SIL header