How to Make a Bar Chart on Your ZX81
Taking a turn from games, March's program is a bit more useful. Although not as flexible as some modern programs, Bar Graph does the job. Add some data and print. What could be easier? Well, a lot.
Making a bar graph or chart.Best have your information ready…
Posted Mar 24, 2018 by Steven
6 min read
How to Make Digital Rain on Your ZX81
I’ve been wanting to create my own version of digital rain for some time. The effect is well known from the Matrix movies, which used florescent green characters. Inspired by that version, I decided to go retro and generate a black and white stream of characters using the ZX81…
Posted Feb 20, 2018 by Steven
6 min read
Fight Your Way to Victory with This ZX81 Space Shooter
Nothing starts the year out better than a space shooter. The top of the printout was quite faded, so I wasn’t sure about ZTSXXSTZ when I started to type it in. But, once I got the first few bits working I realized I had something worth sharing.
Playing it for the first time…
Posted Jan 20, 2018 by Steven
4 min read
What Can You Do with a Simple ZX81 Animation?
Although may of my early programs were games, I spent a fair amount of time experimenting. December’s program, Slow Down, is one of my animation experiments. It is a straight forward sprite animation, with a twist. I used the ZX81 against itself to slow it down…
Posted Dec 26, 2017 by Steven
4 min read
Star Fight Is a Simple ZX81 Shoot ’Em up Game
Back in 1983, Star Wars imagery flooded my life. With the release of Return of the Jedi that year, it only fueled the inspiration of my young teenage self. So, it shouldn’t come as a surprise that I would create games with that look and feel. Star Fight, this month’s program, is one such game
…
Posted Nov 26, 2017 by Steven
5 min read
Windmill Is a Quick and Dirty ZX81 Animation
There are a ton of windmills in Idaho. Mostly big ones for power, but you see a few smaller ones used for irrigation and wells. But, when I wrote this month’s program, I couldn’t remember any being around where I lived in Indiana. No matter…
Posted Oct 30, 2017 by Steven
5 min read
Tabular Is My Simple and Easy ZX81 Word Processor
To date, most of my programs have been games and animations. It may come as a surprise that I also wrote a word processing program. Using a custom printer command, I designed a font that would allow you to use lowercase letters…
Posted Sep 25, 2017 by Steven
6 min read
Quickly Avoid the Spiders in the ZX81 Game Tarantula
Tarantula, August’s program of the month, was part of a pair of games that made me think I was a game developer. At the age of fourteen, I didn’t let problems like the lack of a distribution channel tarnish my dreams…
Posted Aug 30, 2017 by Steven
6 min read
How Long Can You Last against the Attack
Wanting something interesting, I struggled to find a ZX81 program to share. Plus, it was getting close to the end of the month. Digging into my old notebook, I stumbled upon Missile Defense. Although short, I expanded it into a something worth playing. Let’s dig deeper.
Signs of the times…
Posted Jul 27, 2017 by Steven
5 min read
My ZX81 Tic-Tac-Toe May Not Look Pretty, but You Can Win
As June winds down, I find myself reminiscing about writing month’s program. 34 years later, I still remember the glow of the TV as it lit the notebook in my lap. Although I have fond memories of Tic-tac-toe, time isn’t as kind to it. Let’s dig in.
Would you like to play a game…
Posted Jun 25, 2017 by Steven
6 min read
Can You Get the High Score in the Worst ZX81 Dice Game
Okay, although not the worst ever, Dice Game is pretty dull. With only two dice, no strategy, and no replay value, you might think this an odd program of the month. But for the young teenager that wrote it, it was pretty cool in 1983. Let’s dig in and see why.
It’s all about the code…
Posted May 28, 2017 by Steven
7 min read
Bet and Win in Stud, a Simple ZX81 Poker Game
For March’s program of the month, I offer up Stud. Written in 1984, it was my first computer card game. Calling it a card game is disingenuous as Stud is a simple high/low betting game. There are no rules or even a deck of cards. Yet simple can be fun in this random poker game.
An infinite deck o…
Posted Mar 24, 2017 by Steven
3 min read
Pictures Are Pretty, How to Make a ZX81 Draw
Sometimes one function can do a lot. For February’s program, picture uses a line drawing routine to draw a pretty picture. Okay, pretty is in the eye of the beholder. But, nonetheless, it is a picture. The fun, though, is in watching it draw.
A computer and a boat, together are art…
Posted Feb 25, 2017 by Steven
4 min read
Can you hack the computer and save the world?
“Agent 51, your goal is within reach, but there is a problem.”“Understand,” you reply. Professional as always, you only allow a hint of annoyance in your voice. “Explain.”“Well, the plans are in the room in front of you, but the floor is a trap…
Posted Jan 22, 2017 by Steven
5 min read
Can you guess the right code to win?
I used to play Mastermind when I was a kid, a simple code breaking game. One player would set up a sequence of colored pegs and the other would have to guess it in a set number of turns. My version, called ZX Master Mind, has the computer creating the code…
Posted Dec 22, 2016 by Steven
4 min read
Can You Avoid Death in the ZX81 Game Stick Shift?
Dodging games were the rage back in the early ’80s. Wanting to add my own take on the genre, I created Stick Shift, November’s program of the month. The goal is simple. Dodge other cars, oil spills and spikes while not crashing into the wall. Mess up? Well, it’s game over for you…
Posted Nov 24, 2016 by Steven
3 min read
Bugers Will Kill You in October's ZX81 Program of the Month
While working to improve the way I display my ZX81 programs, I ran across one that didn’t have a picture. Finding that odd, I did some research and found that I’d written a page for it back in 1999. To my surprise, I’d never uploaded it…
Posted Oct 25, 2016 by Steven
3 min read
Trail Blazer is my ZX81 Tribute to Tron’s Light Cycles
One of the coolest movies when I was a young teenager was Disney’s Tron. What geeky kid didn’t want to watch a movie about computers and video games? Sprinkle in some computer animation and how could I not fall in love.
Needless to say, Tron was the inspiration for more than a few of my program…
Posted Sep 18, 2016 by Steven
6 min read
Electon is August’s ZX81 Program
I painted more borders on the ZX81 than just about any other shape. An easy way to confine movement, it shouldn’t come as a surprise that Electon starts by building a box. And before you ask, this month’s ZX81 program isn’t another version of snake…
Posted Aug 22, 2016 by Steven
7 min read
3D Image is July’s ZX81 Program
Not everything I wrote on the ZX81 was a game, although I did write a lot of those. In fact, some of my first computer programs did nothing more than print pictures. 3D Image, a badly named program, is one of my experiments in animation on the ZX81…
Posted Jul 20, 2016 by Steven
4 min read
Vargen Crown is June’s ZX81 Program
“Jealous of Vargen’s accomplishments, a rival kingdom has attacked and kidnapped your king. As head Knight, you mount a quest to return the King, hidden somewhere in the forest by his captors. But hurry! The King's ransom has a time limit…
Posted Jun 27, 2016 by Steven
9 min read
Up Is Down in Faller, May’s ZX81 Program
Walls and creatures always make for a nice game and Faller, our program of the month, has both. It takes a bit of imagination, but watch the icky spider climb up the wall towards you. Their goal, of course, is to knock you off and claim the wall for themselves…
Posted May 21, 2016 by Steven
6 min read
Laser Blast is April’s ZX81 Program of the Month
April is close to wrapping up and I was able to find time this weekend to type in another ZX81 game. Laser Blast, this month’s program, has you saving the world. Kind of cliché I know, but hey this was 1984…
Posted Apr 27, 2016 by Steven
9 min read
Computact is March’s ZX81 Program
Ah, spring time. As winter melts away, the weather goes haywire and it’s time to enjoy the bouts of sunshine, rain and the occasional thunderstorm of hail. Perhaps it’s fitting that in the middle of this meteorological mayhem that Computact came back to life…
Posted Mar 22, 2016 by Steven
7 min read