Timer in Assembly
While working on a game project, I needed a way to time what a user was doing, all in Z80 assembly. The ZX81 does not have a clock mechanism, but it has something close.
Timex/Sinclair 1000
1K Othello
Not too long ago I discovered the Dr. Beep did a 1K version of Othello. I thought I would look into the game and see how good it is. The game will play either the white or the black side. It uses high resolution graphics to display the board. The whole game fits into 893
Tom Bent’s Improved ROM
In early 1985, Tom Bent released an EPROM with an upgraded version of the ZX81/T/S 1000 ROM. It was released as the “Sinclair ZX 8K ROM Upgrade”. The package contained an EPROM and an adapter board to fit the ROM into the socket of the old ROM.
Tom Bent’s Improved ROM Read More »
ZXBETA User Guide and Tutorial
ZXBETA is a music tracker software for the ZX81 with the ZonX-81 sound system. The user guide and tutorial was published on my website a few months after the last issue of ZXzine, but I thought I would document it here for those that might have missed the announcement.
ZXBETA User Guide and Tutorial Read More »
QZX Newsletter
QZX newsletter was a Sinclair newsletter for folks that like HAM or amateur radios. The idea was to combine radios with Sinclair computers.
Memotech Z80 Assembler
One of the modules that Memotech created for the ZX81 was the Z80 Assembler that plugged into the back of ZX81. The assembler had a menu system that allowed the user to create, edit, list and compile z80 assembler programs.
Memotech Z80 Assembler Read More »
Gomoku on the ZX81
I recently started getting into the game of Gomoku and wrote a paper on the history of computer implementations of Gomoku. I ran across a number of version of Gomoku written in BASIC.
Gomoku on the ZX81 Read More »
T/S 1510 & Cartridge Clone
When the T/S 1500 was released, Timex also released the T/S 1510 cartridge system. The T/S 1510 was a cartridge dock that plugged into a 1500 or 1000. Game cartridges were then plugged into the dock and when the 1500 was powered up, the game on the cartridge started up. For the 1000, a USR
T/S 1510 & Cartridge Clone Read More »
ZX81 “Mouse”
Something recently got me thinking about having a mouse on a ZX81. At first I was thinking of a traditional mouse with a movable arrow. This might be possible with hi-res graphics, but I’ve never tried using hi-res graphics.
Lunar Lander
Recently the book “50 years of Text Games” by Aaron Reed, was released via Kickstarter and I was able to get a copy. The book starts off with some of early and better known text-based computer games (at least for someone that got into computers in the early 80’s). The second game documented is ROCKET,
Assembly Parameter Passing
I am writing a assembly language routine that needs to send data back to a BASIC program and to get data from a BASIC program. Getting data from the routine is fairly simple if it a single value. Getting data to the routine is more complex as the USR call does not allow for arguments.
Assembly Parameter Passing Read More »