Composite output from a Sega MegaDrive

[Calpis]

Switch-less may not work for everyone, as some models of the MD1 have the reset to trigger at logic high, not low, hence the clock pin isn't pulled low

a nice 74hc14 between the reset pin and the 74hc74 would do the trick.

??? it's a T flip-flop, in this application it doesn't matter if reset polarity is high or low, all that matters is that at some point there's a low to high transition for it to toggle. Also if someone installed that mod how I suggested -- taking RESET from the CPU, it would ALWAYS be active-low since that doesn't change from 68K to 68K.

[mooseblaster]

That does seem a lot more complicated then the 74 logic switch one for no real good reason and does require you to hack your pcb. The cost of the 74 chips is probably cheaper then Pic and 74 chip too.

I think the idea is that it offers a smoother, more controlled region switch - but I can agree it seems to be a lot of extra work for minor benefit.

[Jamtex]

Also if someone installed that mod how I suggested -- taking RESET from the CPU, it would ALWAYS be active-low since that doesn't change from 68K to 68K.

You are right of course and it is probably a better way of doing so, that was you only need the one 74 chip and a few soldered wires to make a multiregion switchless mod.

I think the idea is that it offers a smoother, more controlled region switch - but I can agree it seems to be a lot of extra work for minor benefit.

Does it? I use the single chip 74 flip flip mod and it works all the time.