During a recent move I lost the monitor for my Amstrad CPC464.
Is it possible to adapt the output of this to work on a modern monitor or on television set?
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Yes, it is possible. There are a number of ways:
(taken from CPCwiki)
If your TV does not have SCART, but composite video input, you must
Either use a RGB to CVBS adapter (using for example an AD724 chip), or
if you don't mind having a B&W signal, you can make an easier adapter by taking pin 6 (LUMA) to the CVBS input.
For the first solution, we did a small batch of a little PCB that holds an AD724 and associated components to get a cheap RGB to CVBS/S-Video adapter. This is the schematic:
And this is the board, almost finished:
I have one of these, and this is how my CPC6128 looks in a TFT monitor :) (it looks darker but that is because of the short exposure of my camera)