I've found an interesting technical document
http://history-computer.com/Library/2200_Reference_Manual.pdfTo give you an idea of the level of detail in the PDF...
Overview, list of peripherals
Differences between 2200 version 1 and version
Processor arrangement, ALU, memory with block diagrams. And details of the instruction format (which binary digit does what) and the whole instruction set.
Once you get to the IO part there are device address assignments and circuit diagrams.
CRT format is 80chars by 12 line, P31 green phosphor.
I'm resisting the temptation to try making one!
http://www.old-computers.com/museum/computer.asp?c=596 has background info.
It says there Computer Terminal Corporation (CTC) launched the Datapoint 2200 product, which became so popular CTC changed their name to Datapoint Corporation.