Contents |
Description
The Daewoo CPC-400S, also called the X-IIs, is same as CPC-400 but with superimpose and digitize functions. 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.
A switch on the back allows to get stereo PSG sound, with channel A on the left and the two other channels on the right. It's not an ideal stereo output as the sound of the B and C channels can be lower than that of the A channel.
Some strange behavior has also been noticed when using games with a SCC soundchip. Besides, many CPC-400/400S machines were never fully tested before releasing on the market.
| Brand | Daewoo |
| Model | CPC-400S |
| Year | 1988 |
| Region | South Korea |
| Launch price | ₩390,000 |
| 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 |
| Keyboard layout | QWERTY/Korean + numeric keypad |
| Extras | 1 or 2 720kB 3,5" floppy disk drives, reset button, lightpen connector, video digitizer, superimposer, stereo PSG sound, Hangul BASIC |
| Emulation | ROMs dumped and emulated, except for the superimpose, digitize and light pen functionalities. The rear expansion port is treated like a regular MSX cartridge slot. |
Pictures
Specifications
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.
The mixing with the MSX sound output and the external sound output can be controlled by writing to the I/O port F7h as below.
F7H W b0: Back side audio R (“0" for mixing on)
W b1: Back side audio L (“0" for mixing on)
Slot Map
| Slot 0-0 | Slot 0-1 | Slot 0-2 | Slot 0-3 | Slot 1 | Slot 2 | Slot 3 | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| Page C000h~FFFFh | 128kB Memory Mapper | Cartridge Slot | Expansion Bus | |||||||
| Page 8000h~BFFFh | Kanji Control ROM | |||||||||
| Page 4000h~7FFFh | Main-ROM | Hangul ROM 1 | Hangul ROM 2 | Disk ROM | ||||||
| Page 0000h~3FFFh | Sub-ROM |
Connections
- RGB output
- Analog sound stereo & Composite video output
- Analog sound stereo & Composite video input
- Keyboard connector
- Lightpen connector
- Data Recorder connector
- Centronics compatible Parallel port for a printer
- 2 general connectors (Joysticks, Mice, Paddle controllers, etc)
- 1 cartridge slot
- 1 Expansion bus slot
- Power plug for main power supply (JIS C 8303 class, AC 100/220V +/-10% 60Hz)
- 2 power outlets for monitor and another device (AC 100/220V)
Repair and Upgrade
Links
- Daewoo CPC-400/400S User Manual (Korean)
- See link on DW64MX1 replacement project website for schematics of keyboard
- Blog post about a CPC-400S repair, part 1 , part 2 , part 3 , part 4 , part 5