6809 Based Computer

This is what happens after you have spent a while experimenting with your CoCo out the expansion port. You wire up your own computer! This tangled mess is a fully functional 2 Mhz system.

This machine has been built a bit at a time. I usually get one portion fully tested then transfer that part to a PC board. Lately I have fallen behind though and a large portion still resides on protoboards. I removed the keyboard recently, and constructed a DC supply to be used in a mobile application.

System Details   Main Board    68B09 CPU, 32K Ram, 32K Rom, Dual 68B21 PIA for I/O I/O Board 1    32K EEPROM in system programmable, 8 channel A/D Converter I/O Board 2    Dual 68B40 Programmable timers   In the mess   146818 Real Time Clock / Calendar                        LCD Display                        Stick input device                        7 - 30 VDC Computer controlled power supply

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