Daisen Sangyo MX-2021
This page was last modified 21:09, 5 July 2022 by Mars2000you. Based on work by Retropixelwarriors and Rderooy and others.



This rare MSX2 computer without MSX logo was designed specifically for Factory Automation to control robotic arms and other kind of machinery. It was aimed at the Japanese market.

The design is somewhat unusual with a ruggid white box including

  • two locations for vertical floppy disk drives
  • three vertical cartridge slots allowing useful extensions such as RAMdisks for timing critical operations or control sensors
  • a RS-232C interface

This machine is provided with a mouse and a keyboard, that is the same as for the NTT Captain Multi-Station as it has also the KPC (Kobe Port Captain) logo.

Several devices, components and extensions were available for this professional computer:

  • MX30A - internal 2DD floppy disk drive - ¥38,000
  • MX30B - internal 2DD/HD floppy disk drive (with built-in MSX-DOS 2) - ¥52,000
  • MX-400 - replacement keyboard - ¥11,000
  • MX-200 - Z80 STD bus motherboard (10 slots) - ¥19,000
  • MX-201 - MSX bus motherboard (3 slots) - ¥8,500
  • MX-35 - SRAM cartridge - 2 versions: 1MB and 500kB
Brand Daisen Sangyo
Model MX-2021
Year 1988
Region Japan
Launch price ¥89,000
RAM 128kB
VRAM 128kB
Media MSX cartridges, 2DD/HD floppy disks
Video Yamaha V9938
Audio PSG (YM2149 integrated in MSX-Engine S1985)
Chipset Yamaha S1985
Keyboard layout QWERTY/JIS
Extras reset button, third cartridge slot, RS-232C interface, location for two 720kB/1440kB 3.5" floppy disk drives, firmware
Emulation ROM dump needed. See this thread for details


Daisen Sangyo MX-2021
Daisen Sangyo MX-2021 inside
Daisen Sangyo MX-2021 back
Daisen Sangyo MX-2021
Daisen Sangyo MX-2021 PCBs
Daisen Sangyo MX-2021


The MX-2021 is a MSX2 with a Z80A from Sharp (LH0080A) and a MSX-Engine from Yamaha (S1985).


Note: no Data recorder connector!