These were the colour monitors sold together with the classic CPC-computers.
The only difference between the CTM640 and CTM644 models is the additional 12V power supply for the CPC664/CPC6128's disk drive in the later model.
Technical Specs.
Tube diameter: 36cm/14" Visible diameter: 34cm/13.5" Input voltage: 220V~/50Hz Power consumption: 65W Output voltage: 5V
12V (CTM644 only)
Pictures
Weblinks
Manual
The procedure of setting up the CPC with the MP-1/MP-2 modulators is described in the CPC's user manual.