patch bay MIDI is designed to use with a sequencer/computer,
a master keyboard and 8 MIDI instruments.
8 to 1 by the digital selector
Master Keyboard IN
Sequencer Insert IN
out (version 3.2) OR 2 group of 4 out each (version
Sequencer Insert OUT
merge based on 8031 microcontroler
push buttons and 2 x 7segment leds on front panel
selector and mode/output control
signal leds, 1 merge overflow led
at power on .
19"-1U psu 230Vac /5Vdc
is two versions of the MPB3 with different configurations
of routing. The most useful for Home Studio, sequencer work
is the v3.2... Both work well anyway.
MPB3 v3.1 perform 4 MIDI output configurations...
MPB3 v3.2 have 2 configurations :Synoptic
v3.2. The merger is connected before (PRE) or after
(POST) the insert sequencer plugs (INS) by a set of electronic switches. This is very handful for sysex edition.
the MK IN plug is for the Master Keyboard MIDI Out...
Plugs INS IN et INS OUT (INsert Sequencer) are respectively
for MIDI OUT and IN of the sequencer/cpu
PCB draws of the MPB3 in Gif + the merge eprom bin file
and other related stuff are in MPB3GIF.ZIP
(286K ). Provided pcb are for 6 or 8 pins dip optos
like 6N135...6N138, best ones for MIDI applications.