Hi,
Yah...I've been siting on since you wanted to build a controller. I was waiting for the calculators to go on sale....then I got busy with other stuff.
The beauty of TI calculators is that they are fast...Z80s running at 5 to 10 MHz or MC68000 runing at 8 to 10 MHz (depending on the model). As you know, the original Macs, Ataris and Amigas had the 68000 8MHz as its CPU [img]smile.gif[/img]
I2C code has already been written for those calculators.
www.ticalc.org
HP calcs are nice...but they are harder to find and a bit more expensive.
- Victor.