Re: TI-H: TI link protocol and PCB design software

To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: TI link protocol and PCB design software
From: Greg Hill <gregh@xmission.com>
Date: Wed, 29 Apr 1998 10:27:38 -0600 (MDT)
Delivered-To: ti-hardware-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <002001bd7312$7c476060$0100000a@imprealm.mdo.net>
Reply-To: ti-hardware@lists.ticalc.org


> Wow.. here's a response to an earlier mail from you (October 96) on the same
> topic:

archives go back that far?!? Anyway, I never actually did anything with
the port.. just repeated what I had heard here on TI-H. A dangerous thing
to do, indeed. :)

> First the sending calc pulls either R or W to ground, to indicate a 0
> or 1, respectively.  The recieving calc then pulls the other wire to
> ground, to confirm that the bit was recieved.  Both calcs then clear
> the link (all lines are brought back to 1), and then repeat the
> process for all 8 bits.

So there is a wire A and a wire B. If the sender pulls wire A low, it
means the sender wants to send a 0, and the receiver pulls B low to ack.
But if sender wants to send a 1, it pulls wire B low and the receiver
pulls A low to ack.

Is that how it works..? If so, does the tip on the link cable correspond
to wire A or wire B?

-- 
Greg Hill
greg-hill@bigfoot.com
www.comports.com/link

Follow-Ups:

TI-H: TI-85 tape drive

From: Jim Cox <jofc@pacifier.com>

References:

Re: TI-H: TI link protocol and PCB design software

From: "Robert Cicconetti" <zarquon@mdo.net>