Ah thanks for that H3NRY, that's right the first Apple ][ only had an NTSC output, that's why PAL was such a headache.

I agree the board is most likely an internal scan converter if only because it has that 9-pin connector for a monitor as well as two RCA outputs. Do you think it also handles sound, hence the second RCA, or it has dual video outputs? The sound is carried through one of the pins on the power connector, so the board has access to both.

Love that the adapter you were involved with drove a color TV set. Could the Mac with this adapter take advantage of color in any way?