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Vorticon's Blog



Oscilloscope Graphics with the TI 99/4A Computer

Posted by Vorticon, 31 August 2017 · 305 views

I recently came across videos on YouTube showing how to use an arduino to create graphics on an oscilloscope. The basic idea was to use a digital to analog converter (DAC) to convert digital signals from the arduino into analog voltages which could be then fed into an oscilloscope set up in XY mode to create what essentially amounts to cartesian drawings....


3D printed solar filter for telescope/camera

Posted by Vorticon, 20 July 2017 · 326 views

So with the upcoming total solar eclipse on August 21st 2017, I decided to get my hands on a solar filter for my 8" Dobsonian telescope so I can grab some video and pictures of that rather infrequent event. Since I had bought my telescope from Orion, I checked for a compatible solar filter on their site and found out that it was priced at $145! There was...


Wireless weather station managed by the TI 99/4A - Final

Posted by Vorticon, 08 June 2017 · 1,965 views

So it's time for a new hardware interfacing project for the TI 99/4A, namely a wireless weather station managed by that venerable computer. I think it will be a fun project but likely with a steep learning curve. The goal is to have a functional prototype in time to demo at the 2017 Chicago Fair.
 
So where does one start? The most obvious would be f...


Parallel Port Interfacing Using Extended Basic On The TI 99/4A Computer

Posted by Vorticon, 17 January 2017 · 455 views
TI 99/4A, Parallel port and 1 more...
As some of you know, I am constantly experimenting with interfacing the TI 99/A computer to the real world, and I am very fond of using the parallel port for that purpose because it is very easy to interface and program. That said, that kind of use of the parallel port does require low level programming, generally using assembly language, although one cou...


Slot car computer control with a TI 99/4A computer

Posted by Vorticon, 14 October 2016 · 1,265 views
TI 99/4A, Slot car and 1 more...
Slot car racing sets have always fascinated me, and I have owned a few over the years. Unfortunately, it was always difficult to find opponents to race against beyond just a few runs. I have dabbled many times with the idea of a computer controlled opponent over the years, and finally decided to tackle it as a demo project for the 2016 Chicago Internation...


Forgotten hardware projects

Posted by Vorticon, 29 September 2016 · 366 views
TI 99/4A and 2 more...
In 2009, I for some reason changed my YouTube user name, and in the process a couple of hardware videos I had under the old name were no longer linked to my newer projects. This bugged me, so I decided to included them here for posterity :)
 
1- Light pen for the TI 99/4A computer
This was a crude attempt at creating a light pen for the TI given tha...


Why a blog?

Posted by Vorticon, 29 September 2016 · 304 views
TI 99/4A, Hardware, Programming
I am by nature a tinkerer with a wide range of interests, and every year I come up with a variety of projects, whether in hardware or software, most of which nowadays end up on YouTube. 
Unfortunately, I have rarely documented my thought processes with each project, nor any mistakes I made along the way to completion. So I figured going forward I wou...