jmp.no/blog

A friend requested that I did a quick presentation of the Joko Uno computer, which I built a couple of years ago. It's a very simple computer that anyone can build. It's fun, educational and last but not least low-cost. The bare essentials are the ATmega controller (I'm using the ATmega128) and a the MicroVGA interface by Secons. I sprinkled a few more parts for fun:

You are looking at: A) ATmega128 on a DIP64 board, B) MicroVGA, C) RS232 debug port, D) ISP port, E) GPIO port, F) Piezo buzzer and finally G) LED.

I equipped the microcontroller with a customized version of DK BASIC. I added support for ANSI graphics, sound (piezo), LED on/off and debugging via the spare RS232.

If you want to build one yourself, it should not take more than 10 minutes on a breadboard. All you need is an AVR, the MicroVGA interface and the DK-BASIC interpreter.

Here's a quick demo of it in action:

If I were to do one more thing with this one, it'd be to encase it inside a PS/2 keyboard, so that I'd end up with something that really gives that retro feeling I'm aiming for.

Well, that's it for the JU. Back to the shelf to collect some more dust.