via this auction
"This keyboard from 1986 has many similarities with the Casio , 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. Unfortunately this instrument is missing the great built-in synthesizer, sequencer and 3 octave switch of the VL-Tone.
Although the music playback from the ROM- Pack includes wonderful polyphonic accompaniments, the player can play own musics only monophonic with thin and dull sounding blip rhythms. A bit unusual is that this white keyboard has brightly coloured orange and red buttons and red lines while Casio normally preferred pastel colours. Also a red case version of the PT-82 was made. In 1987 it was re-released in grey as .
