I received the computers very well packed including a networkcable, 1.5 m long
with 2 DIN-plugs. The machine boots like this:
The message 'Classroom network version 3.0' is produced by the networkinterface.
The other machine states 'No.1' at the end of the line. The command 'CALL HELP'
or '_HELP' gives some brief information on the possible commands. These commands
are on the student machine:
And of course a lot more on the teacher computer:
I was very surprised to hear that these computers have a built-in CP/M, check
this:
For the younger visitors, CP/M is/was an advance network-aware multitasking operating system. A manual for CP/M 2.2 can be found here (PDF). This CP/M creates a ramdisk (H:) but when it finds a diskrom is keeps looking for A:, that's what you see in the screenshot.