CoCo++
I spent some time transcribing the CoCo 3 schematic into KiCAD to contribute to the bit preserve project.
Using that schematic, I created a drop in replacement board which I subsequently ordered, assembled, and tested.
At this point I consider that project done and time to move on. If you are interested in the bit preserve
project here is the link.
Bit Preserve, recreating classic computer schematics
So now it's time to have fun....
I want to base this board on the CoCo 3 for several reasons.
- It's the latest real CoCo.
- I never used one in my youth.
- When people upgrade to to the GIME-X, they may want to use their otherwise unused GIME
- If used with a GIME-X then there would be a new CoCo added to the world.
To start this I stripped the CoCo 3 portion out of the bit-preserve project and created this repository so that I could make changes to the board that I would like to see. I'm making this available so that anyone can contribute ideas and expertise.
Goals
I still don't know what all of the goals are but I'll list some ideas that I've had or that others have mentioned or recommended.
- Having fun
- Mod for potential DMA
- USB keyboard
- Reduce overall size
- A different form factor
- Fit it in a polycase ZN-45
- HDMI or VGA out
- Composite out
- Surface mount components
- 12V power supply with standard barrel connector
- Replace DAC/ADC chip with equivalent circuitry
- Replace SALT chip with equivalent circuitry