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Sync24 is (was) used by Roland, to syncronise machines before the midi became popular.
Basicaly, it's just a “pulse clock sync” at 24ppqn (24 pules per quarter note)
This converter help to sync your Roland Tb-303 Tr-606 Tr-808 to sync with midi, or to sync your apeggio (sh-101 / juno60 etc..)
Such a device allready exist and is distributed by :
but it's often pretty expensive. (From 50 to 100euro)
Now, you can build your own for much less.
It's working both ways :
It is made of :
(i will describe this part later, because i must improve it)
You dont need a screen, so it can works with batteries for quite a long time.
Sync24 Connectors Are Not MIDI Cables
Dont use midi cables as sync24 cables, because the wiring is different, and most often, the pins 1 and 5 used by sync 24 are left unwired in midi cables.
Is still beta, but working fine. It's tested in both directions with :
Get it here : http://sidabitball.free.fr/cli/sync_boy/MB-sync0.7.zip (Link was temporarly offline!!)