[sdiy] midi clock

[Rude 66]

wouldn't it be easier to make some kind of trigger/clock input on the casio?
a lot of these toy things are timed by a resistor.. i've gotten things like
a speak & spell to respond to my mono poly's trigger output.. the sn76477
synth does that too.

r./



----- Original Message -----
From: <harrybissell at prodigy.net>
To: <elmystico at earthlink.net>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, December 04, 2002 6:20 PM
Subject: Re: Re: [sdiy] midi clock


> I'd trace the keyboard matrix very carefully...then have a
> PIC (or similar) decode the midi note-ons and close analog switches
> to emulate the matrix.
>
> I would not bother trying to do the tempo...because you will have
> no feedback as to what tempo the Casio was at to start...or any way
> of syncronising.
>
> H^) harry
>
> --------Original Message--------
>
> From: elmystico at earthlink.net
> To: Seb Francis <seb at is-uk.com>, pfperry at melbpc.org.au
> Cc: synth-diy at dropmix.xs4all.nl
> Sent: Dec 04 2002 10:44
> Subject: Re: [sdiy] midi clock
>
> >well, these hardware midi threads have also prompted me to ask a question
> >I've had under my belt for a while.  Has anybody seen or done any work on
> >providing Midi capability for old casio's? particularly the "MT" series.
> >I've seen the SK-1 Midi article, but it doesn't really apply and also
> >requires a custom chip circa '88 that I don't think is available.  The
> >relevant processes for Midi to control are 1. the keyboard and 2. The
Tempo
> >of the presets and rhythms 3. which sounds and rhythms are chosen.  I've
> >logged a HUGE amount of hours analyzing the ins and outs on the big NEC
uP
> >on these guys and could probably build a clone uP that would run off an
> >external clock etc.  but I would really much rather build a hardware Midi
> >interface and leave the uP alone.  So if anyone's done or seen anything
like
> >this, please pass it on!  It's a pet project that's been on the back
burner
> >for way too long.
> >Thanks
> >G.
> >----------
> >>From: Seb Francis
> >>To: pfperry at melbpc.org.au
> >>Cc: synth-diy at dropmix.xs4all.nl
> >>Subject: Re: [sdiy] midi clock
> >>Date: Tue, Dec 3, 2002, 7:44 PM
> >>
> >>pfperry at melbpc.org.au wrote:
> >>
> >>> > > detecting any given MIDI byte. Both use a UART chip (6402) which
seems
> >>> > > to simplify things considerably.
> >>> >
> >>> Well as a non-programmer I am naturally sympathetic to the 6402, but
> >>unless you salvage one from a very old modem or compter, a PIC costs
> >>less... also, some of  those Penfold circuits might be making heroic
> >>assumptions regarding the MIDI signal beig pretty clean, no sysex etc.
> >>
> >>I would agree here.  After reading that Penfold book, I built a MIDI to
16x
> >>drum trigger + 8x gate interface based on a 6402 and discreet logic.  It
> >>ended up being a very big circuit which could easily have been done
using a
> >>PIC and minimal external components.  At the time though, I was very
> >>inexperienced with electronics, and having to learn all about PICs at
the
> >>same time as trying to learn electronics would have been too much.  The
> >>whole project was definitely a worthwhile learning exercise if nothing
else :)
> >>
> >>And (just like pretty much all of the Penfold circuits) the logic I used
> >>will not handle all MIDI eventualities properly.  Having said that, it
> >>seems to work pretty well, as long as I set my sequencer to send the
right
> >>type of note off messages!
> >>
> >>Seb
> >>
> >>P.S. If anyone actually wants a 6402 chip (they're pretty hard to find
> >>nowadays), I have a couple of spares kicking around which I would sell.
> >>
> >>
>
>
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