This article describes the final solution that I used to make both ROMs available to my ZX80. 1 installed the ROMs piggyback in the socket and switch selected the ROM to be used. The modification is very simple and requires only a soldering iron, an spdt switch, and a few inches of wire.
4K/8K ROMs in One ZX-80 Read More »
Tape loading monitor. The monitor consists of two LEDs, a diode, some wire, and a case to house everything. The number 1 LED acts as an indicator of too low a volume or of the correct volume. The number 2 LED is an indicator of volume which is too loud.
In Isolation you attempt to encircle one of the computer’s men, isolating him from all of his cohorts. A man is isolated when you have placed one of your men above, below, to the left, to the right and in the four locations diagonally adjacent to the victim. Therefore, a man located in a corner
Books published about SincIair/MicroAce computers.
The Exploding Bookshelf Read More »
The program will usually display three rows of characters on the screen at any lime: the upper alphabet (UA) row, the lower alphabet (LA) row, and the message row. which will be empty at first. The program allows the user to select letters from the alphabet rows for display in the message row.
Two Switch Human Interface for the Communicative Impaired Read More »
The ZX81 Parser and User-Defined Commands; More on the 16K RAM Pack Schematic; Addenda to “The ZX80/81 Video Display System.”
This column will feature short programs to show off your computer, impress your family and friends, and tickle your imagination when SYNC arrives at your place.
The fundamental conversion described here can be made with almost any KB switch array. 40 keys, new or used, so long as the switches are normally open and are closed with a key stroke.
Keyboard/System Conversion: The First 40/1 Keys Read More »
Have you ever wanted to put a reverse character in a string but you had no way of doing it? Here is a simple answer, a small machine language program that will reverse a character for you.
I wanted to develop a method of storing as many three-letter words as possible in my 1K ZX80). using as little memory as possible. The solution is based on the fact that charaeter numbers of the letters can be compounded into a single number, which can be stored in an array element. Thus three letters
Storing 3-Letter Words in an Array Read More »
