Starting somewhere
To manage all functions that need to work in the µLind computer I desided to break it down in stages, and in stage 1 only functions that are needed to work to easy test the computer was added. That would be:
- CPU – A 6809
- ROM – A simple EEPROM to load a BIOS from
- RAM – To be able to use a stack and store information
- Signal (Read/Write and Chip Selects) and address decoding PLDs
- Prototype Expansion Port – To be able to test further features
- Serial Chip – to be able to debug and transfer programs easier
The use of an expansion port lets me prototyp other features of the system, introduced in Stage 2 or 3. So before sending the Stage 2 board to fab I will prototyp those features on the expansion port. I have also use for it to easily connect an logic analyzer to it instead of hooking it to legs of the chips.
| Firmware files | Logic |
| Schematic | Schematic (PDF) |
| Gerber | Gerber |