AM 320-01-808
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2. CB 45 (Main Connection Board)
The connection board CB 45 carries the MIDI and
the RS 232 interfaces, apart from the audio
outputs headphones, Main LIR and tape.
With regard to the MIDIIRS 232 interface, let us
mention that in "receive mode" the circuit
switches over from MIDI to RS 232 (with
multiplexer IC 2, HC 157) only if DSR (pin 6
at the Sub-D-socket) is at about +10 V. This
signal has to be sent by the connected
computer. Also the CTS signal has to be
generated by the computer (if not, set this pin
at +12 V).
The board sends MIDI OUT and RS 232
simultaneously.
3. CB 46 (Additional Connection Board)
On this board there are some additional audio
outputs and a Leslie control circuit. This
circuit recognizes whether a Leslie is hooked
up via the 15-pin Sub-D-socket and sends
this information to the master via LESINS.
The master switches the instruments routed
via WV to the Leslie amplifier, which
transmits the amplified signal to the Leslie.
The rate can be set with SLOW and FAST. These
open collector outputs can, for instance,
control the relays (the necessary voltage - 12
V - is also applied to Sub-D), which effect
the slow/fast switchover of the Leslie.
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