Date   : Mon, 13 Aug 2007 05:03:04 +0100
From   : jgh@... (Jonathan Graham Harston)
Subject: Emulating Econet hardware?

>Message-ID: <46BF6C42.4000406@...>
 
Pete Turnbull <pete@...> wrote:
> On 12/08/2007 16:16, Jonathan Graham Harston wrote:
> 
> > Do you mean SIO/1, not SIO/2? The SIO/0 has seperate transmit and
> > receive clocks for Channel B, the SIO/1 has a single clock for
> > Channel B.
> 
> That's actually the wrong way round :-)
> 
> There are several versions, of which the common ones are SIO/0 and
> SIO/2.  The /0 has the Port B 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.
 
"There are two Z80-SIO options: the Z80-SIO/0 and the Z80-SIO/1...
see figure C4-3
 
Figure C4-3:
 
  28 +<--RxDB
  27 +<--RxCB    27 +<-- RxTxCB
  26 +<--TxCB    26 +--> TxDB
  25 +-->TxDB    25 +--> DTRB
  24 +-->RTSB \              \
               \              \
               Z80-SIO/0      Z80-SIO/1    "
 
pC4-22, Zilog Device Datasheets, Adam Osbourne & Associates.
 
I don't have anything that mentions an SIO/2.
 
-- 
J.G.Harston - jgh@...                - mdfs.net/User/JGH
United Kingdom Tercentenary : 1707-2007 : http://yr300.org.uk