Manufacturer:	ITT
Model	Courier 9216-X
Year:	1986
CPU:	MC6800
Memory:	64K
Display:	Color CRT
Keyboard:	Proprietary standard, DB9
Main port:	IBM's serial coaxial port
Additional ports:	Option port. Internal expansion port for boards ("Keyboard simulator" board fitted)

My unit has been imported from Germany in early 1990s. These units were relatively easy to convert into colour PC monitors (as there are red, green, blue and two sync signals) and owner wanted to convert it saving money on expensive display. Fortunately for me, no electronic experts have been found and the unit survived in quite neglected (but electronically untouched) state in a garden shed. It was only needed to replace capacitors to make it start.

Start-up

It boots to simple POST displayed in green while maintaining while status line at the bottom. It shows version number of ROM (the same as in its sticker), and state of "coax" (probably coaxial serial link to mainframe), "kbs" (?Keyboard simulator?) and "kbd" (keyboard).

Disassembly

To get into monitor and power supply, just remove 2 bottom screws and pry the upper cover. Be careful with front latches, they are like hinges, but they work the way opposite to most typical casings. You are here.
To get into mainboard: Put the unit on screen on a soft surface, rear of CPU facing upwards. Unscrew 4 screws (they usually stay in bottom part), remove bottom part of casing. Slide the rear from upper part of casing exposing mainboard.
To remove upper CPU part from display part - this is tricky and usually there is no reason to do it (except if unit was in a garden shed for a few years and its casing needs to be entirely washed), but after completely removing mainboard (note where which cables go!) it is possible to unlatch the metal disc part.
You have to make this disc go totally out or some way be on the other side of the narrowing in plastic "neck" in which it sits. Now you have two choices:
1. Unscrew, unwind and unsolder wires from the metal disc part How about plugs? Will they fit through the hole in disc?.
2. Carefully grind down the narrowing in plastic (on which the disc is placed), grinding two small breaks (a few mms thick) on opposite sides to rotate the disc 90 degrees and slide it through these openings into display later. This is not visible for user.
Turn the base to have upper "button" upwards until it won't turn anymore. Press the button into case and try to turn it beyond the point of resistance. It should finally turn and unlock, you'll have a loose CPU case in hands with only metal disc locking it.
If you made these 2 holes in plastic part, rotate the metal disc into them and remove upper part of CPU case.

WARNING: Now it's very difficult to put it back.