TG16 region mod question - for those that've done it before

[FABombjoy]

Instead of using a big, awkward, expensive, uncommon 8PDT switch to flip-flop D0-7, has anybody tried using a pair of Quad 2-input multiplexers?

Seems like you could just wire them up to the data lines, once forwards (D0-7) on source A inputs, and once backwards (D7-0) on source B inputs & use a SPDT switch to toggle the Select lines between high & low, switching the outputs between normal/reverse.

Does that even make sense?

I'm just kinda getting into digital electronics, so please tell me why this wouldn't work (if it doesn't). If it's never been tried... if I can find another bare TG16 console I just might give it a shot.

[omnedon]

I've seen this in a mod that stopped working. 4 IC's in two pairs on top of eachother.

It seemed cool, but I wouldn't call it neater, and it had ceased to switch modes, for non obvious reasons (switch was fine).

Thinking out this IC stuff makes my head hurt. If you sort out a way to do it, I'd love to read about the hows and whys.

Sounds like a more complex version of the saturn switchless region mod.

[FABombjoy]

Did you happen to note the IC part numbers?

This is a bit more complex off the bat, but I would think having the luxury of switch type / placement would make up for it.

[omnedon]

I've forgotten, sorry. Should've written it down. The IC's were all wired up, but it was trapped in US mode. No shorts. No loose wires.

It just stopped being able to swap the connections.