This Yamaha computer is specialised in music and sound production. In fact it is a classic MSX 1, but if you bought the special Yamaha synthesizer and piano keyboard, then it was clearly different. You got 48 pre-recorded sounds with a quality really surprising for that time, and as it is real synth, you could change or create you own sounds.
The YIS-503 is in fact the same computer as the Yamaha CX5M, but it has not got the SFG-01 Sound Module and MIDI interface integrated.
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YIS-503 / Diabolik
BUILT IN LANGUAGE
Microsoft Extended Basic (MSX Basic V1.0)
QWERTY Mechanical keyboard, 73 keys
32 kb (up to 64 kb)
32 kb BASIC/BIOS ( MSX BASIC V1.0)
Mode 0 : 40 x 24 Mode 1 : 32 x 24
Mode 2 : 256 x 192 with 16 colors (Hires mode) Mode 3 : 64 x 48 with 16 colors (Multi colour mode) 32 sprites
General Instruments AY-3-8910 Programmable Sound Generator 3 channels, 8 octaves
2 joystick sockets, 1 cartdridge slot, Tape-recorder plug (1200/2400 bauds), TV output, Centronics interface, Side bus (60 pins), Expansion bus
SFG-01 and SFG-05 sound modules, Disk drive, Magnetic cards reader, Piano keyboards, and more...