Another year and another Vintage Computing Christmas Challenge (VC3 for 2024). I rushed a bit to get mine in so I do feel it wasn’t as short as possible. I did take a somewhat unique route to solving the problem which makes the build more interesting. I made an auto-run version for Present so you could see it in action.
The year is almost over and time to close out the year with a short program. Watching some videos on character displays in UNIX, I was inspired to create my own version of Hello World. This version scrolls through a stream of random digits until the message is displayed. How fun is that?
Today marks the 40th anniversary of the 1984 Dune movie, a film that still holds a special place in my heart. Don’t get me wrong—I thoroughly enjoy Denis Villeneuve’s stunning adaptations, and I admire how he’s brought Frank Herbert’s world to life for a new generation. But for me, the original remains unique. It’s tied to so many of my childhood memories and the passions I cultivated during those years.
One thing I hadn’t done before on the ZX81 was hires graphics. There are numerous reasons, but in general it was because I hadn’t tried. That changed after being encouraged in my ZX81 group to use with with Mandelbrot Set program. So I did.
After wrapping up the last print scroll routine, I immediately dove into improving it. While functional, the original version felt a bit limited. With this update, you’ll find more flexibility in printing displays, though at a slight cost to speed.
As plans go, I actually have a few programs teed up to share. Many are smaller programs that I could work on here and there. Occasionally, I run across an idea that upends those plans and I end up going another direction. So, here we are in September with a math program for the Collatz Conjecture.
Sometimes, you do things out of necessity. I spent an inordinate amount of time working on adding automatic scrolling to a PRINT command. In fact, I haver another version of my print scroll routine I’ll talk about later. But this is about a utility program. A way to print out BASIC code in hex. And this article is about what I did and why.
Finding inspiration again from my programming groups, the idea of an infinitely scrolling screen of text came up. There were a couple of different solutions posted, some quite ingenious. I had done something similar in the past, but this time I used a bit of machine code magic to create a more flexible solution. The result is Print Scroll.
We took a road trip early in the spring to Twin Falls to see Shoshone Falls. Known as the Niagara of the West, Shoshone Falls is quite a show and definitely worth the trip. We picked a time of year when we knew the falls would be at their fullest. We were drenched with mist getting out of our cars. Although not the best photo I took of the waterfalls, it captures the power of the water rushing over the ledge. A spectacular sight that I felt made a great top image for my blog.
My ZX81 programming has taken a back seat of late as I focused on other activities. Whether family, work, or the latest video game update, I haven’t put as much effort into finishing projects. For this month, I decided to focus on tackling an interesting problem, emulating the PRINT USING command.