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#1 2008-02-03 10:29:19

Kartoshka
Pac-Man
From: israel
Registered: 2007-08-22
Posts: 208

MIDI THRU

On firestarter's midi-interface v1, there's only MIDI IN.

Now, for electronics/midi guru's, a question:
if i manually solder all 5 wires from the incoming midi socket to another midi socket inside my c64, will this function as MIDI THRU?
yikes

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#2 2008-02-03 15:07:45

Jaicen
Centipede
Registered: 2006-07-14
Posts: 461

Re: MIDI THRU

Actually, you probably won't need all five wires. Midi is a serial connection, so you can use just two if you don't need the +5v line. Look up he pinout wink

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#3 2008-02-03 16:30:40

ron
PROPHET64 GURU
From: berlin
Registered: 2006-07-08
Posts: 502
Website

Re: MIDI THRU

But since when is MIDI-Thru possible with an Y-cable? Or did I mistake Katroshka's question?

All MIDI-Thru solutions I've heared of require at least two logical gates and resistors

http://whitefiles.org/b1_s/1_free_guides/fg1mt/pgs/h10d3.png

edit: mhh, one resistor if you're dropping the +5V...

yikes

Last edited by ron (2008-02-03 16:34:13)

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#4 2008-02-03 22:25:30

firestARTer
Administrator
From: Germany
Registered: 2006-06-27
Posts: 579
Website

Re: MIDI THRU

Yep, i also think, there is at least one logical buffer needed. You could probably have luck with a 2nd parallel cable (pin 4 and 5 of the midi connector), but i wouldn't count on that.

Else you would need a buffer (or 2 inverters) on Pin 7 of the microcontroller (connected with 2 resistors on pin 4 and 5 of the midi-thru connector).


firestARTer - Gameboy - C64 - Atari Music
Hardware developing for your favourite homecomputer musicsoftwares
http://www.sidsyn.com
http://www.myspace.com/firestartermusic

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#5 2008-02-03 23:43:32

Kartoshka
Pac-Man
From: israel
Registered: 2007-08-22
Posts: 208

Re: MIDI THRU

firestARTer wrote:

Else you would need a buffer (or 2 inverters) on Pin 7 of the microcontroller (connected with 2 resistors on pin 4 and 5 of the midi-thru connector).

Schematics / parts needed is highly welcome if you don't mind this... let's say this again, my electronics knowledge is coming from net only yikes and i'm about doing this RIGHT way...

i assume this has to do something with ron's schematics posted, but again, if you can lay out the correct patch with parts and connections, i'll be more than glad to make it. and post a video smile

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#6 2008-02-04 08:26:22

firestARTer
Administrator
From: Germany
Registered: 2006-06-27
Posts: 579
Website

Re: MIDI THRU

I will post it tonite. No prob!

Additional parts you need:
IC 74HC14 or similar
2x  220 Ohm resistor


firestARTer - Gameboy - C64 - Atari Music
Hardware developing for your favourite homecomputer musicsoftwares
http://www.sidsyn.com
http://www.myspace.com/firestartermusic

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#7 2008-02-04 20:40:29

firestARTer
Administrator
From: Germany
Registered: 2006-06-27
Posts: 579
Website

Re: MIDI THRU

firestARTer wrote:

I will post it tonite. No prob!

Additional parts you need:
IC 74HC14 or similar
2x  220 Ohm resistor

http://www.entitylabs.net/images/lsdjmc2_final_thru.jpg

Check the 2nd 7414 which is connected to the thru. You need all wires which are connected to it.


firestARTer - Gameboy - C64 - Atari Music
Hardware developing for your favourite homecomputer musicsoftwares
http://www.sidsyn.com
http://www.myspace.com/firestartermusic

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#8 2008-02-05 00:07:52

Kartoshka
Pac-Man
From: israel
Registered: 2007-08-22
Posts: 208

Re: MIDI THRU

i'm holding a huge smile for this, thanks!!!

now i owe you a video of it, when done! :p

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#9 2008-04-11 19:28:27

Kartoshka
Pac-Man
From: israel
Registered: 2007-08-22
Posts: 208

Re: MIDI THRU

my midi interface with 'thru' circuit.
thanks ron and firestarter for the schematics. works like it always been there. http://photos-g.ak.facebook.com/photos-ak-sf2p/v231/62/110/696922075/n696922075_506582_8738.jpg

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