Daewoo CPC-300
 | |
| Daewoo CPC-300 (IQ-2000) in the black case | |
| Specifications | |
|---|---|
| Manufacturer | Daewoo Electronics |
| Type | MSX2 home computer |
| Released | 1986 (South Korea)[1] |
| Intro price | ₩345,000[1] |
| CPU | Z80A (Goldstar GSS Z8400A PS) |
| Memory | 128 KB RAM (memory mapper), 128 KB VRAM |
| Storage | MSX cartridge; cassette data recorder |
| Display | Yamaha V9938 |
| Sound | AY-3-8910 PSG |
| Power | 100 V/220 V, 60 Hz, 21 W (label)[2] |
| OS / Firmware | — |
| Model no. | CPC-300 (IQ-2000 in South Korea) |
The Daewoo CPC-300 is an MSX2 home computer made by Daewoo Electronics and sold in South Korea from 1986 at ₩345,000, in a black or ivory case with the keyboard and power supply built in.[1] Its Korean label names it the 대우퍼스컴 아이큐2000 (Daewoo Perscom IQ-2000).[2] In place of an MSX-Engine it uses Daewoo's own DW64MX1 gate array, which contains the 8255 PPI, the slot select logic and the memory mapper. Versions were sold as the Talent DPC-300 in Argentina, Chile and Uruguay, the AVT CPC-300 in Belgium and the Netherlands, the Wandy CPC-300 in Thailand and the Bawareth Perfect MSX2 in Arab countries.[1] The CPC-300E, a version designed for Korean schools, uses the same main board with half the RAM and without the joystick ports, light pen interface and clock.[3]
Specifications
[edit | edit source]| Item | Detail |
|---|---|
| Standard | MSX2[1] |
| CPU | Z80A, Goldstar GSS Z8400A PS[1] |
| RAM | 128 KB memory mapper in slot 0-2, four 4464 chips[1][4] |
| Video | Yamaha V9938 with 128 KB of VRAM[1] |
| Sound | AY-3-8910 PSG[1] |
| Firmware | MSX-TUTOR help program; Hangul BASIC with a SCREEN 9 Korean text mode[1] |
| Clock | RP5C01 with a 3 V backup battery[5] |
| Power | Built in. Label: 100 V/220 V, 60 Hz, 21 W[2] |
Connections
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The rear panel carries the expansion bus, the printer port, a colour or monochrome switch, an RGB socket, composite video and sound outputs, and the RF output with a channel 3 or 4 switch.[6] The machine also has two joystick ports, a light pen connector, a data recorder socket, one cartridge slot and a reset button.[1]
Hardware
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Daewoo's schematics divide the machine into a filter assembly (990A201300), a power regulator board (990A201200), a video board (990A201400) carrying an MC1377P colour encoder, a reset key assembly (990A201700) and the main logic board.[7][4] The +5 V rail comes from an L4960 switching regulator; +12 V and −12 V come from linear regulators.[7] In the photographed machine the supply board sits at the left beside the transformer, the video board stands at the top centre, and the main board is marked "MSX Version 2".[8] The MSX Resource Center records at least three versions of the main board.[3]
The main RAM sits in slot 0-2, a layout that crashes some badly written software, and the common POKE -1 fix for subslot problems freezes this machine.[1] At switch-on the machine runs the MSX-TUTOR help program; pressing SELECT goes to MSX-BASIC, and SET SYSTEM 1 skips the tutor at the next start.[1]
Documentation
[edit | edit source]Daewoo's nine-sheet circuit diagram is hosted as Daewoo CPC-300 Schematics. A project on the SBLive site documents a replacement for the DW64MX1 gate array built from an Altera EPM7128 CPLD and a separate 8255, with photographs of a CPC-300E board and its supply board.[9]
Repair and maintenance
[edit | edit source]- Daewoo CPC-300 General Maintenance
- Daewoo CPC-300 Troubleshooting Guide
- Daewoo CPC-300 Capacitor Replacement Guide
Gallery
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Rating label: 100 V/220 V, 60 Hz, 21 W, Rev. D -
Supply, video and main boards
Related pages
[edit | edit source]References
[edit | edit source]- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 Daewoo CPC-300, MSX Resource Center wiki, 4 June 2026—link(accessed 2026-10-21) Community specification page: made and sold by Daewoo for the Korean market from 1986 at ₩345,000; Korean keyboard with numeric keypad; black or ivory case; power supply built in; SCREEN 9 Korean text mode; 128 KB of RAM in slot 0-2 and 128 KB of VRAM; Yamaha V9938; AY-3-8910 PSG; no MSX-Engine, but the Daewoo DW64MX1 gate array containing the 8255 PPI, slot select, memory mapper and glue logic; Goldstar GSS Z8400A PS CPU; reset button, light pen connector, Hangul BASIC and MSX-TUTOR firmware; RTC batteries under the composite video board; slot map; connections; localised as the Bawareth Perfect MSX2, Talent DPC-300, AVT CPC-300 and Wandy CPC-300; links to the official schematics and the DW64MX1 replacement project.
- ↑ 2.0 2.1 2.2 Rating label of a Daewoo CPC-300 (File:Daewoo CPC-300 rating label.jpg, uploaded to the MSX Resource Center wiki by Mars2000you on 18 June 2020): 대우퍼스컴 아이큐2000 (Daewoo Perscom IQ-2000), MODEL NO.: CPC-300, rated voltage 100V/220V, 60Hz, rated power consumption 21W, Daewoo Electronics Co., Ltd.; stickers 1987.11 and REV.D.
- ↑ 3.0 3.1 Daewoo CPC-300E, MSX Resource Center wiki—link(accessed 2026-10-21) The CPC-300E has the same motherboard as the CPC-300, of which there are at least three versions, with components removed: half the RAM, the general-purpose ports, the light pen interface, and the RTC and its batteries.
- ↑ 4.0 4.1 Daewoo, CPC-300 (domestic) schematics, sheet 3 "CPU interface": Z-80A (IC7), main RAM of four 4464 chips, BIOS, Korean and extended BIOS ROMs (IC4 to IC6), reset circuit with C20 100 µF 16 V, reset key assembly 990A201700. Hosted as File:Daewoo CPC-300 Schematics.pdf; see Daewoo CPC-300 Schematics.
- ↑ Daewoo, CPC-300 (domestic) schematics, sheet 8 "RTC, slot interface": RP5C01 clock (IC15) with a 3 V backup battery; cartridge slot pins 41 and 43 GND, 45 and 47 +5 V, 48 +12 V, 50 −12 V, 49 sound. See Daewoo CPC-300 Schematics.
- ↑ Photograph of the rear panel of a black CPC-300, uploaded to the MSX Resource Center wiki by Gdx on 16 December 2015 (File:Daewoo CPC-300 rear connectors.jpg): sockets labelled EXPANSION BUS, PRINTER, MONITOR COLOR/MONO, RGB, VIDEO, SOUND, CH 3/4 and RF.
- ↑ 7.0 7.1 Daewoo, CPC-300 (domestic) schematics, sheet 1: filter assembly 990A201300 with fuse, line filters and a 220 V or 100 V voltage select switch; power regulator assembly 990A201200 with an RB-401 bridge rectifier and an L4960 switching regulator (IC1) for +5 V, a KIA78012AP (IC2) for +12 V and a 7912 (IC3) for −12 V, output connector CN1 (red +5 V, yellow +12 V, green −12 V, black ground). Sheet 7: video assembly 990A201400 with an MC1377P encoder. See Daewoo CPC-300 Schematics.
- ↑ Photograph of the inside of an ivory CPC-300, uploaded to the MSX Resource Center wiki by Mars2000you on 4 February 2016 (File:Daewoo CPC-300 inside.jpg): transformer and supply board at the left with two large electrolytic capacitors, a finned heatsink, a toroidal inductor and a line filter marked LF-300; video board at the top centre; main board marked MSX Version 2; the cartridge slot in the top half of the case wired to the main board by ribbon cables.
- ↑ DAEWOO CPC-300E MSX2 IQ 2000, SBLive.narod.ru—link(accessed 2026-10-21) In Russian. Photographs of the CPC-300E case, main board and supply board; partial circuit of the board and the video encoder board; original ROM dumps; pin assignment of the DW64MX1; a replacement for the DW64MX1 built from an Altera EPM7128SLC84-15 and an i8255, with the 8255 fitted separately and the keyboard return lines wired to the board in place of IC23.