[Coco] reset behavior suggestions?

[Ciaran Anscomb]

RETRO Innovations wrote:
> My initial idea was that A and B would be distinguished by how long one 
> held the reset button.  short press and release: A.  2s+ reset: B
> 
> But, that requires a "huge" counter in the design, eating up lots of 
> CPLD space. The advantage is only needing to press one button, a button 
> folks are already used to pressing.

Can you do it by adding a few analogue parts?  A single input fed from
a cap that's relatively slowly discharged when reset low?  Then power
up and long-held reset gives you the same input to test...

..ciaran