Connector is 13 pin DIN female at the computer.
Pin Name Description
1AOAudio Out
2CVIDEOComposite Video
3GPOGeneral Purpose Output - linked to Port A bit 6 of the sound chip, user programmable
4M detectif line is low, ST enters high res monochrome mode (no other use) linked to pin 17 of MFP68901 chip
5AIAudio In
6GGreen
7RRed
8+12V+12 VDC (520ST has GND)
9HSYNCHorizontal Sync
10BBlue
11MVIDEOMonochrome Video
12VSYNCVertical Sync
13GNDGround

unknown connector
According to 2 reports in our database (2 positive and 0 negative) this pinout should be correct.

Is this pinout
Source(s) of this and additional information: Hardware Book, Lawrence Wright, Steve & Sally Blair
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