Circuit bent Casio PT-50

December 10, 2013 · Posted in Uncategorized 

Hand built framework and additional panel design for the modifications.

This was the only Casio keyboard with ROM-Pack slot but no key lighting; instead it can load the ROM-Pack musics into an internal sequencer, and with the optional Casio TA-1 module it can even save them on audio cassettes. Even a RAM-Pack cartridge Casio RA-1 was made for this thing to save sequencer data – I never saw any other Casio keyboard designed for using it.

Despite this keyboard looks almost like a twin of the Casio PT-30, there are many small differences. 3 of the 8 preset sounds are changed, the chords and bass timbre is different and also the rhythm set is completely different and includes fill-in. Even the LCD has different segments and shows e.g. a “J” for major chords. Also the sequencer of this thing was changed and is horribly awkward like with Casio MT-70, because it apparently neither can record note lengths in realtime nor melody and chord together, thus everything has to be entered in different modes step by step. But by the general similarities I only explain here the differences to the PT-30.

Main features:

  • 8 OBS preset sounds {piano, harpsichord, organ, violin, flute, clarinet, trumpet, celesta}.
  • 16 preset rhythms {rock, rock’n’roll, disco, 16 beat, samba, latin rock, bossa-nova, beguine, tango, march, waltz, rock waltz, slow rock, ballad, swing 2beat, swing 4beat} made of analogue percussion + bass & piano accompaniment (contains no arpeggio).
  • tempo +/- buttons (19 steps, counts 1..20)
  • different editable sequencer (no realtime recording, terribly awkward!)
  • transpose buttons (12 semitone steps)
  • different LCD display shows pressed keys and chords (only important for the sequencer)
  • ROM-/ RAM- Pack slot (but no key lighting/ melody guide feature)
  • demo button (plays musics from the inserted ROM-Pack when present)
  • multi-chip hardware:
    • CPU= “NEC D1868G 004, 8314EK, Japan” (80 pin SMD)
    • 2x SRAM= “HD  B, 61914, 3D, 23″ (44 pin SMD)

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