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User Manual for the 32 Bank Memory System with

Dynamic Bank Switching for the Devil Fish modified

TB-303 (and for the TR-606 and TR-808)

7 February 2015 www.firstpr.com.au/rwi/dfish/ © Robin Whittle 1996 – 2015.

TB-303, TR-606 and TR-808 are trade names of the Roland Corporation.

TT-303 and Bass Bot are trademarks of Cyclone Analogic.

The words AND and OR denote the logic functions and and or.

32 Bank Memory system: five toggleswitches and one pushbutton switch (the right toggleswitch is for a

different modification – Audio In to Filter), for the TB-303 Devil Fish, with the additional modifications

for Dynamic Bank/Channel Switching: Two 3.5mm sockets for Audio/CV inputs and two red LEDs to

indicate the sockets’ detector circuits being activated and so inverting the address bits generated by the two

left-most toggleswitches.

Contents

1 - Overall description..................................................................................................5

2 - Use in Pattern Play Mode .......................................................................................7

3 - Use in Track Play Mode ..........................................................................................8

4 - Data retention and other details ............................................................................9

5 - Dynamic Bank/Channel Switching (DBCS) .........................................................10

5.0 - Additional hardware................................................................................................ 10

5.1 - Block diagram without MIDI In and Out .................................................................. 12

5.2 - Block diagram with MIDI In and Out ....................................................................... 12

6 - Document history..................................................................................................13

Summary of content (13 pages)

PAGE 1
User Manual for the 32 Bank Memory System with Dynamic Bank Switching for the Devil Fish modified TB-303 (and for the TR-606 and TR-808) 7 February 2015 www.firstpr.com.au/rwi/dfish/ © Robin Whittle 1996 – 2015. TB-303, TR-606 and TR-808 are trade names of the Roland Corporation. TT-303 and Bass Bot are trademarks of Cyclone Analogic. The words AND and OR denote the logic functions and and or.
PAGE 2
0 - Combinations of features for the TR-606, TR-808 and TB-303 This is an additional modification I can install in a Devil Fish modified TB-303 or in a TR606. A similar system can be installed in the TR-808, with the switches aligned vertically on the left side of the machine, with their toggles moving left-to-right. This manual describes the Dynamic Bank/Channel Switching variants of the 32 Bank Memory System, which I started installing in February 2014.
PAGE 3
combinations of modifications. The only combinations shown here are those with the 32 Bank Memory System. “na” means that this option is not possible with the items to the left. I do not have MIDI systems for the TR-606 or TR-808. The 32 Bank Memory system is not applicable to the TB-303 with the Quicksilver-303 system, or to the TR-606 with the Quicksilver-606 system.
PAGE 4
All types of installation with the Audio/CV Input sockets, detector circuits and LEDs (TRcan be equipped with an optional Enable/Disable Toggleswitch which enables both inversion circuits if it is in the up or down position. The centre position disables the inversion circuits. On the TB-303 Devil Fish and TR-606, this switch is located to the upper right of the Tempo knob. The photo at the start of this manual shows a centre-off Audio In to Filter switch in this location.
PAGE 5
1 - Overall description The 32 Bank Memory system provides 32 times the normal memory of the TB-303 (or TR606 or TR-808). This can be used for storing more patterns and tracks, but its most important capability is that the Internal Sequencer, while playing a pattern, can be switched instantly to another memory bank, by the manual manipulation of five toggleswitches and a pushbutton switch.
PAGE 6
The system selects between the 32 banks with the position of five toggleswitches. There are 32 combinations of these five switches being either up or down. Four of the switches are in a horizontal row. The fifth is below them, and is associated with a pushbutton switch which reverses its function. The purpose of the pushbutton switch is to provide a convenient and instantaneous means of switching banks. The switches are not labelled. There is no particular numbering system for the banks.
PAGE 7
2 - Use in Pattern Play Mode (This section and the next do not mention Dynamic Bank/Channel Switching, which is an elaboration upon the basic 32 Bank Memory system described here.) If there is no need to switch banks while a pattern is playing, then operation is straightforward. Simply select the desired memory bank with the toggleswitches and use the machine normally. Switching banks while the sequencer is playing patterns enables the creation in real-time of novel combinations of notes.
PAGE 8
from the new memory bank. Switching will not change the note currently being played, but affects all subsequent notes. Here is a concrete example for the TB-303. The memory switches are set to: ▲ ▼▼▲▼ Bank 18 The Internal Sequencer is started and is playing Pattern 5B in Pattern Group III. Let's call this "Pattern III-5B".
PAGE 9
If you are using Track Play Mode, do not change banks while the machine is turned on. If you accidentally do so, turn the machine off and on again so that the CPU reads in crucial data from the current bank.
PAGE 10
5 - Dynamic Bank/Channel Switching (DBCS) 5.0 - Additional hardware The additional hardware which enables Dynamic Bank/Channel Switching consists of: 1- Two 3.5mm mono Audio/CV Input sockets on the left side of the machine. 2 - Two approximately +1.15 volt detector circuits, which are described below. 3- Two Red LEDs, which are On when the corresponding detector circuit is activated. 4- Two Address Bit Inversion Circuits.
PAGE 11
This approximately 1.15 volt threshold can also be activated by reasonably high level audio signals. Within a fraction of a millisecond of the input voltage going above the threshold, the detector is activated and remains activated for about 33 msec. This means even a narrow positive pulse waveform which reaches about +1.15 volts will turn the detector on continually, as long as its frequency is above about 30Hz. The input can handle +/- 15 volts.
PAGE 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.
PAGE 13
6 - Document history 2014-02-15 Forked the 32 Bank Memory system User Manual to create this manual. 2014-07-29 Loosened the specification for the threshold from “1.1 volts” to “approximately 1.15 volts – and between 1.05 and 1.25 volts”. 2015-02-07 New battery arrangements for memory, so referred to the separate manual for these.