[[Image:ctm644.jpg|thumb|Amstrad CTM640/CTM644 Colour Monitor]]
These were the '''colour monitors ''' sold together with the [[CPC_old_generation|classic CPC-computers]]. Optionally, the computer could have been purchased with [[GT64/GT65]] colour monitors.
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.