MC-10
Micro Color BASIC in 4 KB.
Open the MC-10 in Retro Bench- Also
- Micro Color Computer
- Year
- 1983
- CPU
- 6803 @ 0.89 MHz
- RAM
- 4 KB static (expandable to 20 KB with the 16K pack)
- ROM
- 8 KB Micro Color BASIC 1.0 (Microsoft, 1982)
- Video
- MC6847 VDG: 32 × 16 text and semigraphics, MC1372 RF modulator
- Sound
- One-bit tone via the SOUND command
- OS
- Micro Color BASIC 1.0
Chips
| Chip | Where | Role |
|---|---|---|
| MC6803 CPU (ROMless 6801) | U1 | MC-10 main CPU. A ROMless 6801 with the address and data multiplexed on ports 3 and 4. |
| MC6847 video display generator | U11 | Text, semigraphics and color video from screen RAM. Used in the CoCo 1 and 2, the MC-10 and the Dragon 32 and 64. |
| Micro Color BASIC mask ROM | U3 | Micro Color BASIC 1.0 (Microsoft, 1982). One 8 KB mask ROM. |
Ports and connectors
- I/O expansion edge, 34-pin card edge on the main board UNVERIFIED
- Cassette I/O (J1), 5-pin DIN socket (180°)
- Serial I/O (J2), 4-pin DIN socket
- RF out (to TV), RCA jack
- Power in (J3), Power jack for the AC adapter UNVERIFIED
Power rails
| Rail | Expect | Measure at |
|---|---|---|
| 8 V AC in | About 8 V AC | Power switch; J3 |
| Raw DC | About 10 V DC, full-wave rectified | 7805 input |
| +5 V | +5 V; the service manual treats more than 10 % off as a fault | 6803 pin 7; 7805 output |
Symptoms
- No boot: check 6803, Micro BASIC ROM
- No or bad video: check VDG
- Bad keys: check 6803
- Garbled characters: check VDG