Description: A missile launcher moves up and down on the left side of the screen in the program called Missile Launcher. You fire missiles at ammunition dumps on the right side of the screen. The player gets 25 shots and scores points for hitting the ammunition. Bonus points are scored for destroying an entire ammunition
More Missile Madness Read More »
This book is aptly billed as being for people who want to get down to business with their ZX81s.
The Sinclair ZX81 Programming for Real Applications Read More »
Wire a joystick to map to the arrow keys.
Adding a Joystick to Your ZX81 Read More »
Bob Maunder’s new book is very different from The ZX80 Companion. It aims to appeal to every ZX81 owner, but more to “students” of computing whether at home or at school.
The ZX81 Companion Read More »
A new company, Heuristics, is the exclusive distributor of ZX81 and 16K RAM pack schematics. They also plan ZX81 hardware and software.
ZX81 and 16K RAM Schematics Read More »
For only $149, you now get 8K BASIC, continuous display, the choice of channel 2 or 3 and a newly styled case.
ZX81 – The New Standard Read More »
The ZX81 doesn’t hold simple decimals like .5 & .25 exactly.
Numbers Held Inexactly on the ZX81, Part 4 Read More »
Clever hardware construction, both mechanical and electronic, and a solid comprehension of both 6502 (the Atari 2600 CPU) and Z80 programming combine to produce the very powerful “Game Changer Interface”.
Game Changer Interface Read More »
AERCO’s disk system consists of three major components: interface board, disk drive and power supply.
AERCO FD-ZX Floppy Disk Read More »
To convince the ZX/TS machine not to RUN after LOADing, we CALL the LOAD routine in machine code.
Stop Autorunning Programs Read More »
Locating errors made in typing from printed listings is easy when they include a checksum for every statement, and you have Linesum loaded.
