[Coco] 6309 port of NitrOS-9 Level 1

[Tormod Volden]

On Thu, Jul 23, 2015 at 7:55 PM, Al Hartman wrote:
> You can change out the opto-isolator chip in the Coco 1 to give it a nice
> speed boost for DW operations.

As I said, it is the bit-banger op-amp that must be replaced. To my
knowledge there is no opto-isolator in the coco1.

Googling "coco1 op-amp 57600 baud" coughs up this excellent
explication from Gene:
http://comments.gmane.org/gmane.comp.hardware.tandy.coco/91945

Tormod