Date   : Fri, 10 Aug 2007 13:05:46 +0100
From   : pete@... (Pete Turnbull)
Subject: Emulating Econet hardware?

On 10/08/2007 12:31, Andrew Benham wrote:
> Jules Richardson wrote:
> 
>> Maybe it's a better solution to attach one of those to a PC parallel port 
>> rather than a 68B54 though? Better performance and still commercially
available...
> 
> It might be worth looking at the Z8530 and its later variants (like the
> Z85230).  I think these superseded the Z80 SIO.

Not quite.  The SCC is a slightly modified SIO, with interrupt structure 
changed to better match Intel chips.  ISTR it lost some functionality 
along the way, which is why some people still use the SIO range.

To answer Jules's other question, there were three versions of the SIO, 
with slightly different pinouts.  The /0 has the transmit and receive 
clocks bonded together on one pin, for applications that don't require 
asymmetric speeds; the /1 has no DTRB (the Data Terminal Ready signal on 
Port B); the /2 has no SYNC signal for port B, so that version can only 
do async comms on port B.

-- 

Pete                                           Peter Turnbull
                                               Network Manager
                                               University of York