RE: TI-H: direct bus access


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RE: TI-H: direct bus access



Oh, and one other thing... how many ports?  to completely embarrass the HP48 people, we need at least 34 (they have 33 available)
Christopher Kalos
raptorone@stuytech.com
Executive Director/Administrator
Virtual Technologies Developer's Group


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From: 	Richard Piotter[SMTP:richfiles1@hotmail.com]
Sent: 	Monday, January 19, 1998 11:37 PM
To: 	ti-hardware@lists.ticalc.org
Subject: 	Re: TI-H: direct bus access


I sugested using the Test access port to learn the data and addresses 
for the TI-92's processor. I recomended using it for expansion. I know 
of a design that allows amazing expansion with only a few memory mapped 
I/O lines. I asked if anyone knew the pinnout for the Test access panel. 
A connector could be connected between the ROM pack and the connector to 
give the I/O lines. Your memory mapped I/O could then control this 
expansion device. It is a modular expansion system with various I/O 
cards. It's great! It could easily allow a TI-92 to control a complex 
robot or a model railroad (the original application for the system, but 
it was immediately used for other things, even a homemade security 
system!). I want to see this information!

Richard Piotter
richfiles1@hotmail.com

>
>
>
>Would anyone care if I told you that I have achieved direct bus access 
to 
>a TI 92?  This has enabeled me to create external memory-mapped I/O 
>ports.  Is this a good thing or does anyone even care?
>
>Chris Lambert
>clambert@geneva.edu
>calan@hotmail.com
>URL: www.geocities.com/siliconvalley/peaks/6869
>
>


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