Yamaha YIS805/256

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Yamaha YIS 805 256 MSX computer

1986 (Jun.)
Initially sold for ¥198,000

The Yamaha YIS805 is the latest MSX computer built by Yamaha before abandoning the personal computer market (Yamaha's last computer, the C1, was aimed at music professionals). The 256 variant has 256kB of RAM and two integrated floppy drives, a 128 version was available as well.

The YIS805 is also the only computer of the MSX line to have a separated keyboard with a numeric pad (only the KB1 of the original YIS had a numeric pad as well). The front of the unit has two cartridge slots and two joystick connectors. The back of the unit can house a Yamaha expansion card and sports a RS-232C interface.

No need for a character expansion: the kanji set of the SKW05 is already integrated. A Yamaha software called "The painter" is also preloaded and can be accessed via the CALL PAINT instruction. Additionally, a floppy disk containing MSX-DOS1 was provided in the box.

The computer was localised for the Russian and Arabic markets with different variants but was never sold in the West.

Yamaha YIS 805/256 advertisement
Yamaha YIS 805/256 advertisement
Back expansion slot
Back expansion slot
Double floppy reader
Double floppy reader
Yamaha YIS 805/256 detail
Yamaha YIS 805/256 detail



3.58 MHz Zilog Z80A CPU
256 kb RAM, 128 kb VRAM, 48 kb ROM

Connection terminals and interfaces

2 floppy disk drives
2 cartridge slots
Expander port
Printer connector, Keyboard connector
Joystick port 1, Joystick port 2
Tape interface
RS-232C interface
Video RF output, video composite output, RGB output