[sdiy] MIDI Switch

[Sowa Roman]

It can be done with 2 UARTs and some logic. Connect their data buses
in this way: 6MSBs direct, 2LSBs via OR-gates. The other input of the ORs
are driven by rotary encoder, or any kind of switch to give 2-bit data.
Every channel byte has MSB=1, so whenever 4 LSBs are 0s (channel 1)
and MSB=1, you drive this switch to override midi channel to wanted
number. Then add some logic depending on chosen UART type
to force 2nd UART to send a byte whenever 1st one has received one.
Motorola 6850 (?) would be best as it can be configured without
microcontroller.

hope it helps
Roman

""-----Original Message-----
""From: Moho Disco [mailto:moho at mohodisco.com]
""Sent: Friday, March 15, 2002 8:02 PM
""To: synth-diy at dropmix.xs4all.nl
""Subject: [sdiy] MIDI Switch
""
""
""I want to make a little box with
""a 3-way switch on it that changes
""incoming midi on channel 1 to 
""channels 1, 2, or 3.  I'd like to
""do it with only one MIDI in and
""one MIDI out.  I don't want to
""make a switcher with 3 outs.
""
""Do you guys think this would be
""hard to make?  And would I have
""to program an eeprom or something
""to accomplish this?
""
""Thanks,
""
""Lava
""
""
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