The Berio MIDI 64 and Berio MIDI 96 modules are microcomputer systems, which are able to connect your musical instrument to your musical electronic system equipped with MIDI interface. Thanks to built-in MIDI module, musical instrument acquires sound. Instrument may then be connected to electronic sound module, electronic keyboard or to a PC, which can play your performace real-time.

Technical characteristics:

• Input data
  - input data for Berio MIDI 64 and Berio MIDI 96 modules are signal from contacts of keyboard keys or whatever keypad providing contact of your choice. Berio system is able to serve 64 or 96 keypad contacts, depending on the type of module. Keyboard state is scanned in time multiplex way. This means that keyboard with 64 keys may be connected to Berio system via 16 wires and keyboard with 96 keys may be connected to Berio module via 20 wires only. But it's necessary to connect one cheap small diode under each keypad. Diode and keypad wiring is described on diode matrices diagram below (see supplement). All wires on Berio system board are terminated by screw-connector.

• Output data
  - as output data, standard MIDI signal is generated. System board is equipped with standard 5-pin DIN connector MIDI OUT, which may be connected via standard MIDI cable to a personal computer or electronic keyboard with MIDI IN input. Standard MIDI cable schematic wiring is drawn in the supplement below.

• MIDI channel setting
  - system is able to transmit MIDI data on any MIDI channel. It's useful especially when device receiving generated MIDI signal has other voice assigned to individual channels. For example, some Yamaha instruments have MIDI channel No.1 assigned to solo voice, MIDI channel No.13 is assigned to accompaniment voice, channel No.16 to drums etc. MIDI channel number is set by four jumpers placed on the system board. Jumper cap positions meaning is described in the table (see supplement). Modified jumpers setting is accepted every time system is restarted or powered up.

• Transposition setting
  - system is able to transpose all generated MIDI data. Transposition may be performed over entire range of audible tones, or more precisely over all tones supported by MIDI protocol. Transposition value is selected by seven miniature DIP switches located on the system board. Meaning of DIP settings is described in the table (see supplement). DIP's setting is accepted by system every time the system is restarted or powered up.

• Velocity setting
  - system is able to generate MIDI signal with any velocity, identical for all keys in the keyboard. This feature is useful especially when generated data are merged with other data in real time. It is possible to make one keyboard sound stronger or softer compared to another keyboard, hand-keyboard compared to pedal-keyboard (foot keyboard) etc. Key velocity selection is provided by 7 miniature DIP switches placed on system board. DIP settings are described in the table (see supplement).

• Indication LEDs
  - system is equipped with three indication LEDs:

• green LED Power
  - indicates that power supply of proper polarity is present.
• red LED Error
  - indicates, that system doesn't work. When system action is proper, this LED flashes for a short time only after system reset or power up. Exception to this rule is "Demo mode", which is described in relevant paragraph.
• yellow LED Line
  - indicates data flow on the MIDI line. LED Line shortly flashes after system reset or power up.

• Reset/Accept button
  - Berio MIDI system is equipped with Reset/Accept push button. This button may be used for acceptance of new DIP switches or jumpers setting (MIDI channel, transposition, velocity). In normal action, this button needn't be used - acceptance is provided automatically after power-up.

• Power supply
  - system board is powered by DC voltage 8 up to 18 Volts. Supply current is approx. 50 mA, voltage polarity must be respected. Regular power supply adapter for 230V/50Hz may be used (no special requirements). Recommended output rating of power supply adaptor is 9 V/300 mA.

• Input Digital Filtering
  - for better performance, the Input Digital Filtering unit is implemented in the system. This unit should eliminate the surges on keypad contacts. Keyboard state is read periodically in approx. one-millisecond intervals. State of every keypad must be repeatedly read as unchanged. Only then a MIDI message is generated.

• Unlimited polyphony
  - Berio MIDI system does not restrict polyphony in any way. It means that if, in theory, all keys on keyboard are pressed simultaneously, all corresponding data will be sent on MIDI line.

• Demonstration song
  - if three lowest keypads are pressed during start up or system reset, Berio module plays short demonstration song. While it plays, red LED Error comes on. When demo song has finished, LED Error is goes off and system begins normal operation.

• Diode matrix
  - diode matrix should be implemented near keyboard contacts. Matrix wiring is shown in schematics below (see supplement).

• Damper / Sustain pedal (foot switch)
  - a pedal (foot switch) can be connected to system Berio MIDI, interpreted as Damper / Sustain. This pedal is connected via keyboard diode matrix as the highest keypad (alternative function of highest keypad).

• ESD protection
  - system is based on the High Speed CMOS technology (Complementary Metal-Oxide Semiconductor). Protection against damages due to electrostatic discharges is assured by integrated clamp diodes on all terminals for keyboard.

• MIDI code compatibility
  - MIDI code generated by Berio MIDI system is compatible with any device made by the following manufacturers:

360 Systems, Ad Lib, ADA, Adams-Smith, ADB, Akai, AKG Acoustics, Alesis, Allen & Heath Brenell, Allen Organ Co., AMEK Systems & Controls, Aphex, Apple Computer, ART, Artisyn, Audio Architecture, Audio Veritrieb, Audiomatica, Avab Electronik, Axxes, Baldwin, Berold electronics, Blue Sky Logic, Bontempi/Farfisa, Breakaway Technologies, Broderbund Software, BSS Audio, CAE, Cannon Research Corporation, Casio, Clarity, Clavia Digital Instruments, CTI Audio, DDA, Digidesign, Digigram, Digital Music Corporation, DOD Electronics, Dr.Bohm/Musician International, Dream, Dynacord, Elka, E-mu Systems, Encore Electronics, Ensoniq, ETA Lighting, Euphonix, Eventide, F.B.T. Electronica, Fender, Forefront Technology, Fostex, Fujitsu Electric, Gallien Krueger, Garfield Electronics, Grey Matter, GT Electronics/Groove Tubes, Gulbransen, Harmony Systems, Hinton Instruments, Hohner, Hoshino Gakki, Hotz Instruments Technologies, IBM, IDP, InterMIDI, Intone, Inventronics, IOTA Systems, IVL Technologies, J L Cooper, Japan Victor, Jellinghaus, JEN, Jim Marshall Products, Kamiya, KAT, Kawai, Kenton Electronics, Key Concepts, KMX, Korg, KTI, Kurzweil, Lake Butler Sound Company, Larking Audio, Lexicon, Lone Wolf, Lowrey, Marquis Musi, Matsushita Communication Industrial, Matsushita Electric, Meisosha, Micon Audio Electronics, Microsoft, MIDITEMP, Midori Electronics, Moog Music, Moridaira, Music Quest, Musonix, New England Digital, Nishin Onpa, NSI Corporation, Oberheim, Opcode, Orban, Palm Tree Instruments, Passac, Passport Designs, Peavey Electronics, Perfect Fretworks, PianoDisc, PPG, Quasimidi, Rane Corporation, Real World Design, Richmond Sound Design, RJMG/Niche, Rocktron Corp., Rogers Instrument Corp., Roland, S&S Research, Sequential Circuits, SIEL, Solid State Logic, Solton, Sony, Soundcraft Electronics, Soundtracs, Southern Music Systems, Southworth, Spatial Sound/Anadi Inc, Spectrum Design & Development, Stepp, Strand Lighting, Studer-Editech, Suzuki Musical Instrument Mfg., Synthaxe, TC Electronic, TEAC, The Software Toolworks, Trident, Twister, Uptown, Voce, Voyce Music, Voyetra/Octave Plateau, Waldorf Electronics, Warner New Media, Waveframe, Wersi, Yamaha, Yes Technology, Zero 88 Lighting, Zeta Systems and Zoom.
MIDI systems of other manufacturers are probably compatible too, but this compatibility cannot be guaranteed.

• Installation recommendations
  - wire length between keypad contact and Berio MIDI system board should be as short as possible. The wires must not be grounded, connected to power supply or connected to each other.
  In case, when number of connected keypads is smaller than nominal Berio module keypad number, keypad contacts should be connected in order from lowest keypad to higher keypads. Some highest keypad positions then remains unconnected. Berio MIDI module detects automatically, which keypads are wired and which are not.

• Manufactured system standard features:
  

  • Berio MIDI 64 serves up to 64 keypads
  • Berio MIDI 64 system board
  • powered by DC voltage 8 to 18 V
  • transmit channel select option
  • transposition select option
  • velocity fixed to "forte" (middle) level
  • sustain pedal option.
  • Berio MIDI 96 serves up to 96 keypads
  • Berio MIDI 96 system board
  • powered by DC voltage 8 to 18 V
  • transmit channel select option
  • transposition select option
  • velocity fixed to "forte" (middle) level
  • sustain pedal option.
  Other system configurations can be manufactured (minimum of 5 pcs).

• Mechanical data
  

  • Berio MIDI 64
  • Dimensions: 107 mm x 125 mm x 25 mm (4.22“ x 4.93“ x 1“)
  • Weight: 100 g (3.57 ounce)
  • Berio MIDI 96
  • Dimensions: 107 mm x 125 mm x 25 mm (4.22” x 4.93” x 1”)
  • Weight: 110 g (3.93 ounce)

• Guarantee: 2 years (24 months)