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Re: MIDI Recorder/Player

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In article <n81iz.895505$jB.215982@fx34.am4>,
alister  <alister.ware@ntlworld.com> wrote:
>On Fri, 15 Jul 2016 07:24:08 +0000, Pete wrote:
>
>> Well, I did some digging, and it seems to be perfectly possible to set
>> the Pi to 31.25kbps [sorry for the typo above.]  See for example:
>> 
>>   https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=19908&start=25
>> 
>> Maybe I'd better dig out my old Amiga MIDI box and see if I can adapt
>> it!
>> 
>> 	-- Pete --
>
>it will probably be using either a 1488/1489 chip pair or a MAX232 to 
>perform the necessary rs232 to TTL level shifting
>removing these chips (& linking the input to output pins) should be all 
>that is needed.
>
...chip?... necessary?...rs232 to TTL?...  Ha!  Not on my workbench! (:-)(:-)
Had a 6N138 optoisolator and a couple of 2N3708 transistors.  Worked
perfectly.

Remember that MIDI itself is a 5mA current loop.  It doesn't really
care about voltages (as long as you're careful not to apply them in
a wrong place!).  And the Amiga RS232 UART seemed quite happy to run
with +5..0V rather than the specified ~+/-5V or so.  So with suitable
dropping resistors I could run everything from the +12 supplied by
the RS232 connector.

I pulled the schematic from my files, and it looks as if it should
just need a new set of resistors to work from the 3 and 5V supplies
in the Pi.

	-- Pete --

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Thread

MIDI Recorder/Player "J.B. Wood" <arl_123234@hotmail.com> - 2016-07-13 14:56 -0400
  Re: MIDI Recorder/Player Mike Fleming <{mike}@tauzero.co.uk> - 2016-07-13 21:16 +0100
  Re: MIDI Recorder/Player Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2016-07-13 20:01 -0400
    Re: MIDI Recorder/Player "J.B. Wood" <arl_123234@hotmail.com> - 2016-07-14 07:17 -0400
    Re: MIDI Recorder/Player neverland@GoodeveCa.net (Pete) - 2016-07-15 02:11 +0000
      Re: MIDI Recorder/Player neverland@GOODEVEca.net (Pete) - 2016-07-15 07:24 +0000
        Re: MIDI Recorder/Player alister <alister.ware@ntlworld.com> - 2016-07-15 08:28 +0000
          Re: MIDI Recorder/Player neverland@GOODEVEca.net (Pete) - 2016-07-15 20:39 +0000
            Re: MIDI Recorder/Player neverland@GOODEVEca.net (Pete) - 2016-07-15 20:57 +0000
  Re: MIDI Recorder/Player Roger Bell_West <roger+csrp201607@nospam.firedrake.org> - 2016-07-14 00:09 +0000
    Re: MIDI Recorder/Player Robert Riches <spamtrap42@jacob21819.net> - 2016-07-14 03:19 +0000
      Re: MIDI Recorder/Player neverland@GoodeveCa.net (Pete) - 2016-07-15 02:01 +0000
        Re: MIDI Recorder/Player Jim Diamond <Jim.Diamond@deletethis.AcadiaU.ca> - 2016-07-22 17:06 -0300
          Re: MIDI Recorder/Player neverland@GoodeveCa.net (Pete) - 2016-07-23 01:34 +0000
      Re: MIDI Recorder/Player Hils <hils@saynotospam.net> - 2016-07-16 11:34 +0100
        Re: MIDI Recorder/Player "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-07-16 22:35 +0100
          Re: MIDI Recorder/Player Brian Reay <moi@privacy.net> - 2016-07-17 10:53 +0000
  Re: MIDI Recorder/Player Big Bad Bob <BigBadBob-at-mrp3-dot-com@testing.local> - 2016-08-18 08:37 -0700
    Re: MIDI Recorder/Player "J.B. Wood" <arl_123234@hotmail.com> - 2016-08-18 12:30 -0400
      Re: MIDI Recorder/Player Big Bad Bob <BigBadBob-at-mrp3-dot-com@testing.local> - 2016-09-01 10:43 -0700
        Re: MIDI Recorder/Player "J.B. Wood" <arl_123234@hotmail.com> - 2016-09-02 06:30 -0400
          Re: MIDI Recorder/Player Martin Gregorie <martin@address-in-sig.invalid> - 2016-09-02 11:00 +0000
            Re: MIDI Recorder/Player "J.B. Wood" <arl_123234@hotmail.com> - 2016-09-02 08:18 -0400
              Re: MIDI Recorder/Player alister <alister.ware@ntlworld.com> - 2016-09-02 12:24 +0000
              Re: MIDI Recorder/Player Martin Gregorie <martin@address-in-sig.invalid> - 2016-09-02 13:01 +0000
                Re: MIDI Recorder/Player Rob Morley <nospam@ntlworld.com> - 2016-09-02 17:08 +0100
                Re: MIDI Recorder/Player colonel_hack@yahoo.com - 2016-09-05 16:02 -0700
            Re: MIDI Recorder/Player jack4747@gmail.com - 2016-09-05 00:06 -0700
              Re: MIDI Recorder/Player alister <alister.ware@ntlworld.com> - 2016-09-05 08:45 +0000
              Re: MIDI Recorder/Player druck <news@druck.org.uk> - 2016-09-05 17:39 +0100
                Re: MIDI Recorder/Player Ahem A Rivet's Shot <steveo@eircom.net> - 2016-09-05 20:44 +0100

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