[Coco] How SLENB works ?

[Luis Antoniosi (CoCoDemus)]

On Sun, Jul 20, 2014 at 10:25 AM, Matthew Stock <stock at bexkat.com> wrote:

> If you want to research this yourself, you can get the bus timing info from
> the 6809 datasheet, and the AVR datasheet will tell you how many cycles it
> will take to get into your interrupt handler, how fast the I/O lines can
> change, and memory fetch will take, etc.  Lots of cycle counting.  The
> Arduino clock is only 16MHz, so you only get about 17 AVR clock ticks to
> work with in each clock cycle.  Just entering the interrupt handler eats
> 8-10 of those.
>   -Matt
>

There is this drive emulator for the Atari:
http://www.whizzosoftware.com/sio2arduino/index.html


Maybe I should double buffer the data lines if I wan't them to be
bi-directional, being the arduino buffer controlled by the the arduino
itself


Luis Felipe Antoniosi