[sdiy] midi clock

[patchell]

    Doing a Midi Parser in Hardware would be quite a chore.  The best
way I could think to do it would be to use an FPGA and write the
hardware code in VHDL or VERILOG.  However, this would not use up your
stock of 74xxx chips....Micro Controllers are by far the cheapest, most
efficient way of doing this yet.

Karl Ekdahl wrote:

> While we're at the subject of midi stuff the hardware
> way...
>
> I'm quite inexperienced with electronics and i have a
> HUGE amount of old 74xx, 40xx and 6402:s laying
> around. I was thinking, would it be hard to do a
> circuit that would take midi in NOTE ON and NOTE OFF
> messages and translate it to a 8-line address note
> out, 1-line note on/off and 4-line address channel
> out?
>
> thanks
>
> /Karl
>
>  --- Seb Francis <seb at is-uk.com> skrev: >
> 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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--
 -Jim
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