[Coco] Clearing condition code register

[Robert Gault]

It is very unusual that the CC register is completely cleared. Normally 
only some bits are cleared, the most frequent being the carry bit. Since 
  the carry bit is often used, CLRA and COMA are found in code for 
faster/shorter commands for altering CC bit0.

For anything else, ORCC # or ANDCC # is what you have to use with the 
6809/6309 CPU.

James Dessart wrote:
> How does one go about clearing the CC register? It doesn't appear 
> there's a specific op for it, so for now I'm using "andcc #0", but 
> that'll take up two bytes and 3 cycles, instead of 1 and 2, 
> respectively. I've gone through the Motorola docs and can't find an 
> alternative.
> 
> James
> 
>