Casio PT-80

This keyboard has many similarities with the Casio VL-Tone 1 and PT-1, but includes a "melody guide" key lighting feature for music teaching (not the keys itself light up but a row of small LEDs above them) and a ROM- Pack music cartridge slot.

Casiotone 401

This was Casio's first keyboard with accompaniment and (so far I remember well) also the world first keyboard with automatic single finger accompaniment.

The Casiotone 401 has 16 unusual, partly incredible dry semi- analogue preset sounds and 16 analogue rhythms; also the bass sounds nicely warm and seems to be based on a triangular wave. Unusual is the "hold" switch, much like the manual fingered chord mode (with chord memory) on newer keyboards, here also the melody voice notes hold until any other chord or key combination is played. The noble designed case is unusually heavy, because it is made of plastic coated steel instead of genuine wood

Casio PT-87

Casio PT-87

This grey cased instrument was a re- release of the PT-82 from 1987. (Inside the case embossed marks for 87 and {5, 6, 7, 8} make me conclude that it was manufactured between may and august in 1987.) Unlike the PT-82, it has the classical pale coloured Casio buttons again.

On this photo from eBayyou see my Casio PT-87 and my PT-82 (below).
The PCB of this specimen contains less discrete components, the shielding aluminium cardboard inlay is gone and the PT-87 has also no headphone jack anymore. The CPU is "HD61703B01, 7D 33". My specimen has a strange defect; when operated with batteries, it sounds distorted and howls, while with a power supply it sounds perfect. Apparently the battery voltage (5 batteries = 7.5V) is too low to operate the circuit properly - possibly a defective voltage regulator drops too much voltage.

modifications:

  • Power supply jack polarity changed and protection diode added (with PT-82 and PT-87).


google.com, pub-8492136789179150, DIRECT, f08c47fec0942fa0

Casio PT-20

(photo from eBay, showing my specimen)

This tiny instrument seems to be just a downsized Casio PT-30 and sounds very similar. (I haven't examined the hardware yet.) Unlike the latter it is missing the LCD, the cartridge slot, some of the sequencer buttons, the transpose buttons and 2 high note keys (thus also the "arp. 6" rhythm). Instead of separate rhythm and chord volume sliders it has only a combined slider. Its small case resembles the Casio PT-1. The original German retail price in a German Conrad catalogue from 1986 was 199DM (about 100€).

The likely most advanced member of this hardware family was the ultra- rare keyboard boombox Casio KX-101 (37 mini keys, chord button pad, complex sequencer that saves data on audio cassettes), which was even 4 note polyphonic.