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genocho
September 23rd, 2008, 01:57 PM
Looking in internet always obtain the same results:

Apparently cga to scart conversion is possible, same frequency, common pinout, but I didnīt find any schematic.

I know some old cga cards have rca connectors can make possible to play

cga composite games in a color tv, with 16 colors !!!!

Games like tapper, bruce lee, california games take advantage of this.

I really need an schematic for connect cga din output to a scart connector

and take advantage of the big format of crtīs and composite games.

Any work tested schematic ???

Regards

carlsson
September 23rd, 2008, 03:15 PM
Perhaps you can look for a C128 80 col RGBI to SCART schematic. Its output is so close to CGA that one supposedly can use a CGA monitor for 80 column mode.

Basically I think it is a matter of reducing the signal voltages from TTL levels to 0.7 or 1V. The easy and crude way apparently is to use resistors as voltage dividers. I once made a RGB cable from my BBC Micro to a 1084 in that way. Depending on impedance and so on, I believe resistors in the 200-500 ohm range may do. The higher resistance, the weaker resulting signal.

paul
September 23rd, 2008, 04:06 PM
Not clear on what a "cga din output" is? Is this not a IBM-compatible application? If so, why not just locate a CGA card with an RCA socket and connect it to a Scart breakout connector?