Daewoo CPC-300
This page was last modified 16:48, 3 November 2021 by Mars2000you. Based on work by Rderooy and Gdx and others.




The Daewoo CPC-300 has been manufactured and distributed by Daewoo on the Korean market.

The keyboard is Korean. The color of unit is available in black or ivory. The power supply is integrated in the unit.

This model has an extra text mode in Basic, the SCREEN 9. It is a text screen mode based on the graphic SCREEN 6 to display Korean characters.

It has been localised for several countries:

Brand Daewoo
Model CPC-300
Year 1986
Region South Korea
Launch price ₩345,000
RAM 128kB in slot 0-2
VRAM 128kB
Media MSX cartridges
Video Yamaha V9938
Audio PSG (AY-3-8910)
Chipset Daewoo DW64MX1
Keyboard layout QWERTY/Korean + numeric keypad
Extras reset button, lightpen connector, Hangul BASIC, firmware (MSX-TUTOR)
Emulation ROMs dumped and emulated. The rear expansion port is treated like a regular MSX cartridge slot.


This machine comes with an integrated help, MSX-TUTOR.

You can skip it and go to MSX-BASIC by pressing SELECT when the tutor is shown.

If you enter SET SYSTEM 1 in MSX-BASIC, the MSX-Tutor will be skipped on next boot (go back to default by SET SYSTEM 0).



Daewoo CPC-300 ivory
Daewoo CPC-300 box
Daewoo CPC-300 box (back)
Daewoo CPC-300 black
Daewoo CPC-300 back connectors
Daewoo CPC-300 right side
Daewoo CPC-300 black label
Daewoo CPC-300 inside
Daewoo CPC-300 ivory label




The CPC-300 is a MSX2 that does not use a MSX-Engine but a custom IC DW64MX1 that includes the 8255 PPI, slot select circuitry, a memory mapper and various glue logic. The CPU is a Z80A from Goldstar (GSS Z8400A PS).

The main RAM is present on slot 0-2, a configuration that can cause poorly written software to crash. Also, with this layout, the POKE-1,(15-PEEK(-1)\16)*17 trick to workaround buggy software that does not handle subslots properly will cause this machine to freeze.

Slot Map

Slot 0-0 Slot 0-1 Slot 0-2 Slot 0-3 Slot 1 Slot 2 Slot 3
Page C000h~FFFFh 128kB
Page 8000h~BFFFh Hangul
Page 4000h~7FFFh Main-ROM Sub-ROM
Page 0000h~3FFFh
  • The Hangul ROM includes the MSX-TUTOR firmware, it's a BASIC rom (8000h-BFFFh) that uses screen 7.


Repair and Upgrade


  • Daewoo CPC-300 Schematics (Original hardware plan - This is official design of Daewoo and offered by 이미디 ,member of MSX paradise. According what he has explained, he got it when he worked for Daewoo computer.)
  • See links on DW64MX1 replacement project website for version 2 of schematics