Daewoo CPC-300 Schematics
The Daewoo CPC-300 Schematics are Daewoo's own circuit diagrams for the Daewoo CPC-300 (IQ-2000) MSX2 computer: nine sheets, each with a title block reading "MSX2 CPC-300 (DOMESTIC)".[1] The MSX Resource Center describes them as the official Daewoo design, passed on by a member of the Korean MSX Paradise community who had worked for Daewoo.[2] No date or drawing number for the set as a whole is printed. The scan is about 723 pixels wide per sheet, so small print is hard to read.
Contents
[edit | edit source]| Sheet | Title | Contents |
|---|---|---|
| 1 | (power) | Filter assembly 990A201300 with a 0.5 A fuse, line filters and a 100/220 V voltage selector; power regulator assembly 990A201200 with an RB-401 bridge, an L4960 switching regulator for +5 V, a KIA78012AP for +12 V and a 7912 for −12 V, the output connector CN1, and a capacitor list |
| 2 | Logic power | Supply input CN15 on the logic board, filter chokes, test points TP1 (+5 V), TP2 (+12 V), TP3 (−12 V) and TP4 (ground) |
| 3 | CPU interface | Z-80A (IC7), main RAM (four 4464 chips), BIOS, Korean and extended BIOS ROMs (IC4 to IC6), reset circuit and the reset key assembly 990A201700 with the power LED |
| 4 | Custom chip | The gate array IC2, keyboard row decoding and the cassette interface CN5 with its remote relay RL1 |
| 5 | PSG, printer | 8910A PSG (IC16), joystick ports CN7 and CN8, and the printer port CN2 |
| 6 | (video processor) | V9938 with four 4464 video RAM chips, NE555 reset timer, sound mixing, light pen connector CN6 and the video board connector CN9 |
| 7 | Video | Video assembly 990A201400 (MC1377P encoder, composite video, sound and RF), RGB output drivers on the logic board, colour or monochrome switch and channel switch |
| 8 | RTC, slot interface | RP5C01 clock with a 3 V battery, cartridge slot and expansion bus connectors with their pin assignments |
| 9 | Keyboard circuit | Keyboard circuit |
What these schematics do not contain
[edit | edit source]There is no parts list beyond the capacitor list on sheet 1, no board layout, no disassembly procedure and no adjustment procedure. Some designators in the sheet 1 capacitor list cannot be read at the scan's resolution.
Pages that cite this document
[edit | edit source]- Daewoo CPC-300: supply design and board assemblies.
- Daewoo CPC-300 General Maintenance: voltage selector, fuse, test points and the RTC battery.
- Daewoo CPC-300 Troubleshooting Guide: supply regulators, test points and cartridge slot pins.
- Daewoo CPC-300 Capacitor Replacement Guide: capacitor values.
References
[edit | edit source]- ↑ cpc300sch, Internet Archive, 21 March 2019—link(accessed 2026-10-21) Nine-page PDF, 569 KB, uploaded by [email protected] with the description "Daewoo CPC-300 Schematics".
- ↑ Daewoo CPC-300, MSX Resource Center wiki, 4 June 2026—link(accessed 2026-10-21) Links the schematics as the "Original hardware plan", the official Daewoo design offered by 이미디 of MSX Paradise, who got it while working for Daewoo.
Download: Daewoo CPC-300 Schematics.pdf