A600/A1200 digital video out to Philips CM8833 Mk. II. Is it possible?

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I’ve just bought a lovely Philips CM8833 Mk2, and I saw (and remembered!) that it has a TTL/digital video switch on the back.

Looking at the pinouts of the A600, it seems to have the same or similar digital video out, firstly, can I connect the A600 digitally to the monitor, and secondly, is it better/worse than the analogue connection?

 

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Well, you are right in that Amigas have digital video out and that it can be used with the digital input mode of older monitors. But the “digital” in question here is actually referring to the resolution of each colour signal, rather than any sort of digital encoding like modern DVI, HDMI etc.

Digital RGB means each colour gun (red, green or blue) has a resolution of one bit – that is, it can only ever be on (1) or off (0). With the three colour signals each being either on or off, a grand total of eight colours can be transmitted: red, green, blue, yellow, cyan, magenta, white and black. Many early 8-bit machines (e.g. BBC Micro) had this sort of output, and many monitors had these inputs.

The Philips CM8833, ¬†and the Amiga itself, were both designed to be compatible with this older standard, but both are also capable of much better colour resolutions. So, while you can use the digital signal perfectly well, it won’t be very pretty, and you’re better off sticking with the analogue RGB, which offers 4 bits per gun on OCS & ECS machines, and 8 bits per gun on AGA machines.

  • Mikerochip
    Thank you! Very informative. RGB analogue it is then! (I always wondered about that digital TTL switch! And this clears it up nicely)
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