Daewoo CPC-400S
This page was last modified 00:47, 22 February 2019 by Gdx. Based on work by Mars2000you and Rderooy and others.



The Daewoo CPC-400S, also called the X-IIs, is same as CPC-400 but with superimpose function. It has been manufactured and distributed by Daewoo on the Korean market.

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.

Official price was ₩390,000

Brand Daewoo
Type CPC-400S
Year 1986
RAM 128kB in slot 0-2
VRAM 128kB
Media MSX cartridges, 2DD floppy disk
Video Yamaha V9938
Audio PSG (AY-3-8910A)
Chipset Daewoo DW64MX1
Extras Hangul BASIC, lightpen connector, reset button, 1 or 2 floppy disk drive, stereo PSG sound


CPC-400 & CPC-400S with Monitor
Daewoo CPC-400S rear
Daewoo CPC-400S box


The CPC-400S 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 Disk ROM
Page 0000h~3FFFh


Repair and Upgrade

External links