[Coco] CoCo I/O Ports

[Phill Harvey-Smith]

Steve Bjork wrote:
> At 04:48 PM 11/15/2007, you wrote:
> The only problem is too many assembly coders use the mirror addresses to 
> save cycles when talking to the PIA chips. (I was not one of them.) It 
> has been a problem since day one of CoCo programming. That is why the 
> CoCo 3 kept the same address (with mirrors) all the old CoCo 1/2 I/O ports.

Yep I believe even the CoCo Color basic roms do this in their 
initialisation routines :(

Cheers,

Phill.

-- 
Phill Harvey-Smith, Programmer, Hardware hacker, and general eccentric !

"You can twist perceptions, but reality won't budge" -- Rush.