[Coco] Internet via Coco
skwirl42 at gmail.com
Wed Jul 14 10:52:35 EDT 2010
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.
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.
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