Yamaha YIS-805
This page was last modified 00:42, 29 May 2018 by Mars2000you. Based on work by Rderooy and Gdx.

Contents

Description

Computer

The Yamaha YIS-805 comes with a separate keyboard and in 2 versions:

  • The /128 version has only 128kB RAM and 1 disk drive by default, but there's a location planned for the addition of a second disk drive
  • The /256 version has 256kB RAM, 2 disk drives and a RS-232C interface (compatible, via SCA-01 adapter, with the NTT Captain network)

Both versions have an expansion bus at the back, reserved for a digitizer, also known as 'video enhancer'.

It's the last computer released by Yamaha for the MSX system and the only one with a built-in floppy drive. It has still a special slot for specific Yamaha modules.

The Yamaha YIS-805 was advertised to be used with the following software and extensions:

  • FM Sound Synthesizer Unit Ⅱ SFG-05 ¥ 29,800
  • FM Voicing Program II YRM-55 ¥ 9,800
  • Disk Japanese Word Processor unit SKW-05 ¥ 49,800
  • Paragraph Transfer cartridge YRK-50 ¥ 24,800
  • MSX Captain adapter unit SCA-01 ¥ 40,000
  • Captain modem MD-01 ¥ 98,000
  • EFD-10 Second disk drive for the YIS-805/128 ¥ 40,000

Official price of the Yamaha YIS-805: ¥148,000 (YIS-805/128) or ¥198,000 (YIS-805/256)

The YIS-805/128 has been localised for the Russian market - see YIS-805/128R2 - without the expansion bus slot.

The YIS-805/256 has been localised for the Arabic countries - see Sakhr AX-500 - without the expansion bus slot and the RS-232C interface.

Brand Yamaha
Type YIS-805/128 or YIS-805/256
Year 1986
RAM 128kB or 256kB (? in slot 3-2)
VRAM 128kB
Media MSX cartridges, 2DD floppy disks
Video Yamaha V9938
Audio PSG (YM2149 integrated in MSX-Engine S1985)
Chipset Yamaha S1985
Extras 1 or 2 720kB 3,5" floppy disk drives, THE PAINTER (graphic tool), module with 'computer self-study' software, (only /256 version) RS-232C interface + RS-232C BASIC

Firmware

This machine comes with the firmware THE PAINTER, a graphic utility in screen 5 and a 'computer self-study' software on a module inserted in the special slot.

From MSX-BASIC, THE PAINTER can be launched with CALL PAINT or _PAINT, but you can also boot the computer while pressing the SPACE key to directly start this utility.

Pictures

Computer

Yamaha YIS-805/128
Yamaha YIS-805 underside
Yamaha YIS-805 right side
Yamaha YIS-805/256 front
Yamaha YIS-805 keyboard
Yamaha YIS-805/256 front
Yamaha YIS-805 manuals + module
Yamaha YIS-805/128 back
Yamaha YIS-805/256 back

Firmware

The Painter
The Painter

Specifications

The YIS-805 is a MSX2 with a Z80A from Sharp (LH0080A) and an MSX-Engine S1985 from Yamaha. This computer is available in two models. One with 128kB RAM and one with 256kB RAM.

The /128 version can be easily upgraded internally to 256kB RAM.

Floppy Disk Controller chip is the 8876.

Slot Map

Help needed
The below slot-map is an assumption, it needs to be checked on a real machine.
Slot Slot
0-0 0‑1 0-2 0-3 Slot 1 Slot 2 3-0 3-1 3-2 3-3
Bank C000h~FFFFh Expansion
Bus
Cartridge
Slot 1
Cartridge
Slot 2
Painter
ROM
Memory
Mapper
Module
Slot
Bank 8000h~BFFFh
Bank 4000h~7FFFh Main-ROM RS-232C
ROM
Disk ROM
Bank 0000h~3FFFh Sub-ROM
  • By default the Module Slot contains an unit with a 'computer self-study' software (Beginner's Lesson)
  • The RS-232C ROM is not present on the YIS-805/128 model

Connections

  • RGB output
  • RF output
  • Analog sound & Composite video
  • Keyboard connector
  • Data Recorder connector
  • Centronics compatible Parallel port for a printer
  • 2 general connectors (Joysticks, Mouse, Paddle controlers, etc)
  • 2 cartridge slots
  • 1 expansion bus slot
  • 1 module slot (on right side, 60 pin connector)
  • RS-232C connector (only /256 version)
  • Two AC power sockets
  • Power plug male for main power supply (JIS C 8303 class, AC 100V +/-10% 50/60Hz)