The stocking and installation cost for a header is the same regardless of whether it has one jumper position or 50. It's one insert operation, and then it goes over the solder wave. Even with hand insertion, the assembly cost should be around 15 pence. Now, how many positions? 12 bits each for the 4 mode numbers each in horizontal and vertical, probably 10 or 12 for the dotclock rate, and maybe 8 miscellaneous sync mode bits. Call it 60 bits. A couple of headers should do it. You also need enough shift register bits to read all the jumpers at power-up, so there would be 8 or 10 74HC164 shift registers and some glue logic. Probably not worth putting the etch for it on the OGC1. But if there's a position for an accessory header, it could be an option board. Otherwise it would be a different OGC board.
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