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C=128 RGB signals

I have been told that the 128 rgb out is digital. Is it the same digital that the newer monitors accept?
I was just looking up the specs for an older flatscreen and noticed it accepted anolog and digital rgb signals.

Some of the old CRT monitors

Some of the old CRT monitors had a 9pin connector on the back, this had RBG in. A switch could change the regular analog RGB signal from i.e. the RGB analog to TTL levels used in that connector from the C128. The analog part was/is used from the Amiga's RGB output.
Amongst the many monitors the C= 1084S was one of these monitors, that accepted TTL.
For most flatscreens it accepts VGA (analog) and DVI (digital). These must not be confused with the TTL level RGB from the C128.
If you want a flatscreen monitor you might want to aim at getting one that accepts composite in (or SCART if you live in EU) you could also get a converter from composite to VGA there are some cheap ones that goes for around $30 on ebay

Re: C=128 RGB signals

The engineer at BIT-C= is about finished with his prototype for the C128 VGA adapter.  He's pleased with the colors, having matched them with the output of a flat C128 and measuring the signals at the DAC in a 1084-S monitor.  The latest (only a week or two old) picture that he took of the screen being displayed on a LCD VGA monitor can be seen at


Robert Bernardo
Fresno Commodore User Group

I have the bit-c128 adapter

I have the bit-c128 adapter and a Gonbez 8200. But there is quite a bit of interference when using anything but a black background--a blue background is especially bad.

Does anyone else have this setup, and if so, do you also experience the interference?  If you did and resolved the issue, how did you do it?


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