Date   : Sat, 11 Aug 2007 00:50:43 +0200 (BST)
From   : johan@... (Johan Heuseveldt)
Subject: Emulating Econet hardware?

Hi Jonathan,

On Fri 10 Aug, Jonathan Graham Harston wrote:
> Johan Heuseveldt <johan@...> wrote:

> > OTOH there is the SJ Research design - in its MDFS - with only a
> > Z80 SIO, and lots need to be done in software. I'm not familiar with
> > that serial device, so don't know how much it can do in hardware, and
> > what's left to be done in software.
>  
> The Z80 SIO does more or less everything the 6854 does.

Wow, I'm impressed!

> It is
> interfaced 8-style (IORQ, WR, RD), rather than 6-style (CS, R/W).

That shouldn't be difficult to use on a 6502. The FDC 8271 is the same
in that respect. But I assume the interrupt structure of the SIO is in
line with the special features of the Z80 CPU?


Johan

-- 
Johan Heuseveldt <johan@...              >
  aka  waarland

  The best place is a Riscy place
 
Nudists are people who wear one-button shirts.