Zx81 Tag


Have some fun! Explore the 161 articles tagged with zx81.
Water Bug Was My Attempt at a zx81 Action Game
For most of the day, Iíve been thinking about my Water Bug game as I never really gave it a proper write-up. Finally got around to playing it again, I was surprised to find elements in that I thought were unique to Water Bug II are actually in this version…
Posted 6 days ago by Steven 15 min read

An Early and Bad Attempt at a Yarsí Revenge on the ZX81
Like many teenagers in the early eighties, I was playing video games on my Atari VCS. Yarsí Revenge was a popular purchase, and I spent many hours dodging that stupid missile and trying to take down the shields of the Qotile…
Posted Oct 31 by Steven 4 min read

Building a Better ZX81 Digital Rain using Z80 Assembler
My original plan was to create an z80 assembler version of Moon Lander. But with the trailer release for the next Matrix movie, I found myself revisiting another program. Built entirely in machine language, Z80 Digital Rain expands on my previous version with a splash of color…
Posted Sep 25 by Steven 8 min read

Amping up the Visuals and Gameplay in Moon Lander V2
Last month, I shared an old moon landing program I wrote back in the early 80s. Right after that, I decided to give it a bit of a face lift, updating the visuals without changing the game play. Moon Lander v2 is my updated game, yet still the same BASIC code under hood. A fun new look. As I noted…
Posted Aug 21 by Steven 8 min read

Try Not to Crash the Moon Lander in This ZX81 Game
When I first started programming, one of the games we would play on the old teletype machines was a simple moon lander game. The premise is you would use your thrusters to softly land on the moon. Moon Lander was my take of that program a few years later. A trip down memory lane. I actually enjoy…
Posted Jul 31 by Steven 6 min read

Your Imagination Is Required With Comp Control for the ZX81
As a young teenager, I often wrote programs that I would integrate into other play. In this case, I had probably watched War Games again. The idea of a computer talking to you made for some fun fantasy play…
Posted Jun 24 by Steven 7 min read

Trying My Hand at Animation by Moving a Sailboat on My ZX81
I was hoping to have finished Gem Quest by now, but May didnít afford much time. With Summer arriving and the pandemic seeming to be winding down, at least in Boise, my attention is elsewhere. With a short list of ideas, I decided to play off last month's theme…
Posted May 31 by Steven 5 min read

Having Fun Learning How to Draw Lines on My ZX81
When Simeon Dwyer shared his machine language line drawing routine, I immediately thought of redoing ďThe Picture.Ē Most of my z80 assembly has been with my Gem Quest game. I decided it would be a nice diversion to work on something else, even if a quick one…
Posted Apr 30 by Steven 6 min read

Not My Best Try at Programming an Ultima Clone
Iíve talked about ZX-Ultima before. It was first attempt at building an Ultima like game on the ZX81 using BASIC. Written in 2012, it was a pretty ambitious project for me. I really enjoyed playing Ultima III on my C64 as a teenager. I always wondered what it would look like on my ZX81. It was bad…
Posted Mar 31 by Steven 5 min read

A Developer Diary in Pictures for Gem Quest, a ZX81 RPG
If youíve been following me the last couple of months, you know Iíve been revisiting Gem Quest. Intended to be an Ultima style game for the ZX81, outside of a few demoís I really hadnít gotten far. That isnít the case now…
Posted Mar 07 by Steven 8 min read

How to Build a ZX81 Ultima Game Part 2: Gem Quest
After sharing Tiles, I started to dig into my previous attempts at building an adventure game. Digging through my past research, I thought about encoding the world differently. Sadly, my experiments using MCODER failed…
Posted Feb 25 by Steven 6 min read

How to Build a ZX81 Ultima Game
In 2012 I wanted to see if I could make an Ultima style game on the ZX81. I had an ambitious plan centered on the tile based graphics. After a few months of testing, I was able to create a working prototype called Tiles. Although the game isnít done, the idea behind it shows promise…
Posted Jan 31 by Steven 10 min read

How I Used My ZX81 to Draw the Iconic OP Logo
As 2020 wound down, I had a couple of different ideas for new ZX81 programs. Most of them were graphic programs of various sorts. Themes ranged from dumpster fire pictures, an advent calendar, a virus action game, to a solo RPG…
Posted Dec 27, 2020 by Steven 4 min read

Creating Charts on Your ZX81 Couldnít Be More Simple
As usual, I procrastinated a bit in finishing my ZX81 program for November. Between holidays, work, and NaNoWriMo, I didnít get around to it until this last weekend. I decided to try something a little different for this monthís program…
Posted Nov 30, 2020 by Steven 7 min read

Entering a Program Shouldn't Be This Frustrating
Back in July, I made a mistake and entered in Star Probe again. I had forgotten that Iíd already shared it. But, unlike my first attempt, I had taken a different approach which made it a much different game. Jumping ahead, I decided to finish what I started…
Posted Oct 25, 2020 by Steven 12 min read

Here Is a Silly Test Program for the ZX81
September proved to be a rather busy month, at work and home. It isnít unusual for me, and I usually find time to throw a render or program together. As this month closed, I found myself in need of a program to share and not a lot of time…
Posted Sep 29, 2020 by Steven 3 min read

Here Is My Crazy Idea to Make a ZX81 Game with a Printer
Back in the day I learned to program on school PDP-11 with a 6 teletypes and a CRT attached. I was still in computer club at the time, thinking the 8" floppies were pretty cool. To my despair, the poor thing died that Summer and, when I took my programming class, it was on an Atari 800…
Posted Aug 29, 2020 by Steven 8 min read

Now Is a Good Time to Build My Mini ZX81
A retro blast from the past! The four chip Sinclair ZX81 was the first computer I owned and I thought it would be fun to build a LEGO version of it. The 2K of memory (in my US version) was pretty limited…
Posted Aug 09, 2020 by Steven 4 min read

Can You Win in This Easy Game of ZX81 Dice
Lately, I’ve been reflecting on my programming journey. It is hard to believe that it has been over nine years since I started writing my monthly articles. I’m nearing the end of my printouts, and thought I’d write about my ZX81 Dice Game. Walk down retro lane. Although I’d s…
Posted Jul 31, 2020 by Steven 5 min read

Try to Be a Great Space Navigator Taking This Silly ZX81 Quiz
Having a healthy imagination and perchance for sci-fi, Spaceship is a bit of both. I assume I conjured up the idea as part of some playtime activity. Written in 1983, it was one of my earlier programs and lacked graphics. Yet, it was still a bit of fun. Navigating a spaceship is easy. As a navigat…
Posted Jun 29, 2020 by Steven 5 min read

A Silly Little Code Hack For The ZX81
I have some sort of fascination with code breaking. A byproduct of all the spy movies I watched as a kid. A friend of my would make spy cases with Lego’s, and I had to build my own of course. I had a wallet with home made credentials and so on…
Posted May 25, 2020 by Steven 5 min read

A Good Start To Adventure Game That Never Was
When I was a child, I remember going over to a friends house and playing Wizardry on his Apple. Leaving his house, I was super excited about the game I saw. Although my lowly ZX81 was no match, I had visions of creating my own games like it…
Posted Apr 28, 2020 by Steven 7 min read

It’s Not Easy Surviving the Waters in This ZX81 Game
A bit cliche by 1985, but I was obviously still playing Frogger and the clones it spawned. With all its dodging and moving, the game is classic for good reason. Even in modern times, it has spawned the likes of Crossy Road and other in spirt games…
Posted Mar 29, 2020 by Steven 5 min read

Resurrecting an Old Band Logo in This ZX81 Animation
The ZX81ís graphics be a lot of fun to program. Although I wasnít a big fan of the PLOT command, I do have some examples of its use. My taken on the TS logo for the rock band Twisted Sister is one one example. Like a primitive screen saver, it can be fun to watch. Not quite what it seems…
Posted Feb 27, 2020 by Steven 4 min read

Play an Old Star Trek Game That Fails to Be Fun
Okay, I’ll admit that I was a Star Trek junky. As a kid, I remember eagerly waiting each week to watch reruns of the original series with my family. When 1983 rolled around, I’d watched both of the original movies and owned the comic books that bridged the two…
Posted Jan 25, 2020 by Steven 4 min read