midiDAC firmware

[Trevor Page]

> On Sat, 4 Dec 1999, Trevor Page wrote:
>
> > Please check out the midiDAC on Tony Allgood's website:
> > http://www.techrepairs.freeserve.co.uk/mididac.htm  - It too uses a
simple
> > PIC for which I wrote the software. PCBs and PICs available from Tony. I
> > have a prototype PCB for this design and... wow.
>
> Yes, Tony PCB's are great at least the Superladder PCB which I've got,
> too. Wonder where he makes them for such a low price...
>
> Anyway, there's no firmware available?


My is firmware is available via Tony on a preprogrammed PIC.


> Another note: I've been wondering why people design / build MIDI to CV
> converters with separate outputs for pitch, velocity, pitch bend,
> MIDI controller x etc. as it would be more obvious to have CV outputs with
> software summed and controlled CV outputs.

We chose to sum the pitch bend and note cv outputs using external circuitry
because, to be honest, there would have been some serious limitations with
what could have been done using the PIC used in the design. The most obvious
being that there's limited i/o pins to play about with on the 16f84,
limiting the amount of bits we could use on the DAC.  Anyhow, many people
like to twiddle a pot rather than scale the pitchbend via MIDI. We felt that
this bit should be kept 'analogue' :-)
Of course, I'm speaking regarding the midiDAC only here.


Trev