DIY for Hobbyist or Education: Single Board Computer 6809 (bare and BASIC computer versions)
The Retro 6809 SBC is a DIY 8-bit computer easy to assemble and program for any hobbyist. To get started, the bare version requires only the CPU, RAM, ROM and UART. The system has a MPU, RAM (max 32K…
The Retro 6809 SBC is a DIY 8-bit computer easy to assemble and program for any hobbyist. To get started, the bare version requires only the CPU, RAM, ROM and UART. The system has a MPU, RAM (max 32K, base addr=0), ROM (max 8K, base addr=0xe000) and UART (base addr=0xd000) for serial communication (TTL level) @ 9600 baud.
Then the fully assembled version is a BASIC computer with VGA, audio, PS/2 keyboard and SD card FAT32 for files storage. The optional serial communication is over a USB245R module.
The single supply is 5 Vdc (directly or with a 7805 or compatible regulator).
All the schematic/BOM documentation and ROM source is available.
The retro 6809 SBC project can be consulted on https://github.com/akund/retro-6809-SBC
Hint: if you populate the VGA driver, ensure you have the ATmega328P and the 74ls175, also increasing the VCC to 5.25V to ensure a stable video signal.
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