Re: A86: Port 7 (Link port)

To: assembly-86@lists.ticalc.org
Subject: Re: A86: Port 7 (Link port)
From: Josh Grams <j3grams@earthling.net>
Date: Mon, 23 Nov 1998 14:48:24 -0400
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <19981123141825.12398.qmail@hotmail.com>
Reply-To: assembly-86@lists.ticalc.org


>Hello!
>
>What is the defult state for the linkport on the 86 when you are at the
>homescreen or in a shell. I need to write a program that activates the
>white and/or the red wire when I push a button. Are the wires
>automatically turned off when you start an assembly program? How do you
>activate one of the wires? I know that you'll have to use port 7. How
>many volts and amps come out of the link?

Default state is both wires on. They aren't turned off when you start an
asm program (I think, haven't done any linkport stuff recently). Check the
includes (just ti86asm.inc or whatever) for the numbers to put out port 7
to change the state of the wires. AFAIK, the link is just standard CMOS or
TTL logic - 5 volts, pretty small current load - if you want to run
something from it, use it as a logic input to switch a circuit that can
handle more power.

--Joshua

References:

A86: Port 7 (Link port)

From: "Andreas Finne" <a_finne@hotmail.com>