Yamaha YIS-805

The Yamaha YIS-805 was a professional MSX2 desktop with separate keyboard, expanded memory and disk storage, designed for education, graphics and music applications.

It carried Yamaha’s specialist-computer approach into the enhanced MSX2 generation with higher-resolution video and a workstation-style enclosure.

Notable Features

• MSX2 V9938 graphics
• Separate professional keyboard
• Disk-based workstation configuration

Historical Significance

• It carried Yamaha’s specialist-computer approach into the enhanced MSX2 generation with higher-resolution video and a workstation-style enclosure.

Collector’s Notes

• Exact memory, disk and regional configurations should be verified because YIS systems were often sold into specialised installations.
• Memory, storage, displays and expansion hardware should be documented because configurations often changed during a system’s working life.

Specifications

Technical Information
Name	Yamaha YIS-805
Manufacturer	Yamaha
Launched	Wednesday, January 1, 1986
Country	Japan
CPU	Zilog Z80A compatible
Units Sold
Form Factor	Desktop with separate keyboard
Power	Internal or external mains supply
Networking	None built in
Operating System	MSX BASIC; MSX-DOS on disk-equipped models
Expansion / I/O	Cartridge, cassette, joystick, printer and video connections
Keyboard	Integrated keyboard
Storage	Built-in 3.5-inch floppy disk
Sound	YM2149 PSG with Yamaha music expansion support
Colours	16 on MSX1; expanded palette on MSX2/2+
Graphics	Yamaha V9938: up to 512 x 212 pixels
Display	Television or monitor
ROM	MSX BIOS and BASIC plus model firmware
RAM	128 KB or more main RAM and 128 KB video RAM
CPU Speed	3.58 MHz