[Coco] Internet via Coco

[James Dessart]

On Wed, Jul 14, 2010 at 11:34 AM, coco wal <cocowal6809 at gmail.com> wrote:


> To some extent , you still need to bit bang your spi data to the ethernet

> controller , a  'much simpler, hardware-wise' solution might be relatively

> slow and taxing processor wise how exactly did you plan on implementing a

> coco bus to spi interface ? I assume you would like your packet data on a

> 10Mb/s connection at a reasonable rate , and if under os/9 , being able to

> multitask as  nicely as possible.


Good point.

The SPI driver would be for the enc28j60, yes. The one with the 32
byte address space is the RTL8019, which I have on a bread-board
compatible module. There's a uIP driver for it on the ATmega series,
which is why I had chosen it. But with the CoCo's small IO space, 32
bytes is a lot. So some sort of logic would have to be introduced to
choose which address in that space through some sort of register.
While I have an idea of how to do that, and could probably sketch out
a basic block diagram, I have no idea how to properly implement that
design physically as a card for the CoCo.

-- 
James Dessart
<http://ideaoubliette.blogspot.com/>