[sdiy] Matrix 1000 repair, unexpected hack

[Colin f]

> > Theses 2 chips, U808 and U809, are involved in MIDI handling but
> > so far MIDI IN and OUT seem to work OK, should i worry about the
> > CTS not connected ?
> 
> I'm not familiar with the 6850 but CTS is a hardware handshaking
> signal and as such does not apply to MIDI. If there's an internal
> pull-up, you can leave CTS unconnected (or so I expect).

I've used 6850s for MIDI interfacing many years ago.
You'll find a schematic for the 6850-based Hybrid Music 2000 interface here:
http://www.colinfraser.com/m5000/m2000sch.pdf
and will see CTS and DTS are pulled low externally.

I'm sure it doesn't matter which way they are pulled if you aren't using
handshaking though.

Cheers,
Colin f