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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Protek on November 22, 2007, 10:49:59 AM

Title: Commodore 1901 monitor schematics
Post by: Protek on November 22, 2007, 10:49:59 AM

Found a Commodore 1901 monitor from a local electronics recycling center. No picture though but at least light zigzag stripes on gray bottom. A colleague of mine who has done TV repair work before said it might be salvageable.

Now I really needed to find schematics for the monitor and the pinout for the RGB jack, which to my understanding is TTL only.

Anyone able to help me with these?

Thanks!

Title: Re: Commodore 1901 monitor schematics
Post by: Iggy_Drougge on November 23, 2007, 04:39:40 PM

If it's TTL only, it won't be much use* with an Amiga.

*The Amiga has TTL outputs on its video connector, but due to the nature of digital video, it is limited to 16 (64?) pre-defined colours. Nothing will look good, and everything will look like on an 80s PC.

Title: Re: Commodore 1901 monitor schematics
Post by: Protek on November 23, 2007, 09:33:59 PM

I'm aware of that. I read from usenet that some 1901 have four modes for RGB. One of these modes is analog RGB. The switch in mine is four position although it is limited to two by the casing. Of course it doesnt necessarily mean that the monitor actually supports all four modes.

Anyway, there is a schematic that will convert the analog RGB to TTL using single chip. And I can always use the composite.

Title: Re: Commodore 1901 monitor schematics
Post by: Protek on December 04, 2007, 05:50:32 AM

I did some more research and found that the 1901's successor, the C 1902 and its A variant are possible to be modified to accept analog RGB. I wonder if this would apply for the 1901? Is there anyone who has modded either 1901 or 1902?