User manual

12
5.1 - Block diagram without MIDI In and Out
Below is a diagram depicting the signals an circuit elements for the two channel Dynamic
Bank Switching system. This diagram represents the circuitry of the TB-303 Devil Fish with
the 32 Bank Memory system and the DBCS additional hardware, but without the MIDI In
and Out system. This diagram also represents the circuitry of the TR-606 or TR-808 with 32
Bank Memory systems and two channel DBCS hardware.
The TR-808 can have four channels of DBCS hardware, so this diagram applies for bits 3
and 4 (as for the TB-303 and TR-606) and also for address bits 1 and 0.
1.15 volt
Rear (right) 3.5mm \ /-->-DETECTOR--\-------> Right
Audio/CV \ / Right | LED
Input Socket Ext sig. ===================> \/ |
Affects bit 3. v
|
|
1.15 volt |
Front (left) 3.5mm \ /-->-DETECTOR--\------------> Left
Audio/CV \ / Left | | LED
Input Socket Ext sig. =========> \/ | v
Affects bit 2. v |
| |
Right Toggleswitch ---->------------------>--\ |
Affects bit 2. | | |
| XOR
Left Toggleswitch --->------------------>---\ | |
Affects bit 3. | | |
XOR |
| |
| |
Address bits to the 32 bank v v
memory system Bit 3 Bit 2
If nothing is plugged into the two Audio/CV Input sockets, then the detector circuits will be
Off, the Red LEDs will be Off and the address bit inversion circuits (the XOR gates) will not
invert the input they receive from the toggleswitches. So if the toggleswitch is down, the bit
which forms part of the memory bank address will be 0, as it is for the other toggleswitches
for bits 4, 1 and 0 (assuming the pushbutton is not pressed, since this inverts bit 4).
If an input signal activates the detector circuit, the corresponding LED will be On and the
address bit will be inverted. So if the toggleswitch is down, the bit which forms part of the
memory bank address will be 1.
5.2 - Block diagram with MIDI In and Out
Please refer to the diagram in the section Data flow for Installation 6 in the Devil Fish MIDI
In and Out system User Manual. This is similar to the diagram above, with the addition of
the MIDI In and Out firmware driving the default contacts of the two sockets, and sensing
the potentially inverted bits 3 and 2 of the memory bank address.