AM 320-01-808
56
B. Control Panels
1. KD 11 (Manual Board)
The dynamic measurement is based on the
principle of time measurement. For this
purpose, each key is connected to a switch.
The time from the opening of the rest contact
to the closing of the working contact is
measured. 8 switches are combined in 1
matrix address. For 5 octaves (61 keys), 8
matrix addresses are needed. These matrix
addresses are grounded one after the other,
and the state at the 16 contacts is polled. The
rate at which this polling occurs can be
adjusted via the coding switch, whose
position is checked only after resetting,
however. If this time is very short, the key
must be depressed very quickly for the
loudest value to be reached.
The data is transmitted to a 2 byte parallel port. The
first port (IC 5) contains the pitch and
whether the sound is to be switched on or off;
the second contains the dynamic value. When
the dynamic value is recorded, a flip-flop (IC
8) is set which triggers a FIRO at the master.
When reading the port, only the key (IC 5) is
read which has the FIRO in its upper bit (via
IC 4, pin 13). Thus, it can be determined
whether it has actually been this manual that
triggered the FIRQ request.
If this is true, the dynamic value can be read while
the FIRQ flip4lop is reset simultaneously.
Furthermore, the interrupt can be blocked with the
second flip-flop of IC 8. IC 7 provides the
address decoding process.
The remaining part of the board serves for
pedalboard matrix-interrogation and for
jumper-interrogation (Ju 7-14).
2. KD 2IKD 4 (Manual Extension Boards)
These boards serve as extension boards for the KD
11 to reach the required length of 4 or 5
octaves.
3. Pedalboard
The pedalboard is connected to the KD 11 via Plug
6 and also use the matrix method for keying.
Each pedal will always connect one PE.. line
with a SEL. - line. The pedalboard matrix
diagram shows the combination used by each
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