Re: A92: Link cable

To: assembly-92@lists.ticalc.org
Subject: Re: A92: Link cable
From: Vojtech Pavlik <vojtech@atrey.karlin.mff.cuni.cz>
Date: Wed, 3 Sep 1997 18:44:32 +0200 (MET DST)
In-Reply-To: <19970831184603.15783.qmail@hotmail.com> from Jared Neilsen at "Aug 31, 97 11:46:03 am"
Reply-To: assembly-92@lists.ticalc.org

> >>How many different signals are send through the link cable at once? 
> >>To 
> >>clarify this question a little more, how many wire groups are in the 
> >>cable?
> 
> >there are 3 wires in the cable: one is the ground and the 2 other >ones 
> can
> >put high ( +5 V ) or low ( -5 V ).
> 
> 
> I also have a couple more questions about this.  In what form is the 
> information transmitted through this cable?  And when transmitting are 
> both wires used by the calculator sending or is one used my each? 

You'd better read the sources of some transmission routines. The protocol
isn't too complex, but ain't easy too. It's asynchronous and uses both
wires at once (and in both directions, too), and acknowledges every bit
sent ...

Vojtech.

References:

A92: Link cable

From: "Jared Neilsen" <jaredneilsen@hotmail.com>