Re: TI-H: Port Expander

To: ti-hardware@lists.ticalc.org
Subject: Re: TI-H: Port Expander
From: Grant Stockly <gussie@alaska.net>
Date: Thu, 25 Jun 1998 22:59:47 -0900
Delivered-To: ti-hardware-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <19980626000704.23232.qmail@hotmail.com>
Reply-To: ti-hardware@lists.ticalc.org


You don't need a schematic to design a link port expander...  Come on.
With a 74HC165 and a transistor or two you automatically have 8bit.  Add a
4 bit counter and you can have anywhere from 2 to 4 more easily and up to
16 with another $.70 of parts.  Take a look at Mel's Orrigional memory
expander if you need to.

>I am working on a link port expander for the TI-85, maybe others later.
>I wanted to know if there is any other port expanders out there.  I only
>know of the I2C one, but I can't find that chip so I decided to design
>my own.  It uses 6 chips (all 74LSXX).
>
>thanks
>
>Matt Butch
>
>
>______________________________________________________
>Get Your Private, Free Email at http://www.hotmail.com

References:

TI-H: Port Expander

From: "Matt Butch" <mjb25@hotmail.com>