[Coco] ISA 8bit Cards

[Dave Philipsen]

There's not a whole lot of difference between the ISA bus and what we 
have on the CoCo.  The ISA bus had 20 address lines so a larger range 
for addresses.  It also had separate selects for I/O space and memory 
space which the CoCo does not.  There are separate signals for READ and 
WRITE where the CoCo (6809) combines them in a single signal (R/*W).  
But it's not too tough to get an 8-bit ISA card to work on the CoCo bus.

Most of the projects I've ever heard of for the CoCo were using serial 
cards, modem cards (essentially the same as a serial card), mouse, 
parallel port, hard drive, etc.  A little bit of TTL logic and a fairly 
simple PCB layout will get you what you need.  The more difficult thing 
might be writing the software (drivers) for the card.


Dave


On 12/25/2017 10:39 AM, Carlos Camacho wrote:
> Long ago I read some posts of people/someone connecting 8bit ISA cards to
> send CoCos cartridge port. Don't recall what kind of card. Video? Mouse?
> RS232. Does that ring a bell? Wondering if there are project files
> someplace.
>
> Cheers,
> Carlos
>