| 4K/8K ROMs in One ZX-80 | 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. | Sinclair ZX80 |
| 6 Shooter | 6 Shooter is a game of skill in which you attempt to hit a randomly moving target. When the target appears in a position which you feel is in your sights, you pull the trigger (hit a key). This causes a bullet to be fired, and, if the target is hit, it disintegrates in accordance | Sinclair ZX81, Type-in program |
| Getting Loaded | 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. | Sinclair ZX80 |
| Glitchoidz Report | | |
| How to Invent a Game, Part 2 | Finishing the programming for the game. | Sinclair ZX80, Type-in program |
| Isolation | 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 | Sinclair ZX80, Type-in program |
| Kitchen Sync | The first thing we did when we finished building our ZX81 kits was to play with them— poking through the manual, pressing new keys to see what they did, writing little test programs to see what could be done. It did not take us long to decide that the ZX81 had some features that made | Sinclair ZX80, Sinclair ZX81 |
| Letters | Help Wanted, SGN and Inventory. | Sinclair ZX80 |
| LSCROLL - For Spectacular Screen Displays | How would you like to be able to create a “Times Square” display which moves from right to left without upsetting other items on your ZX81 (or 8K ROM ZX80) screen? Would you like to display graphs or functions such as a sine wave on your screen when they need more than 32 columns of | Sinclair ZX80, Sinclair ZX81, Type-in program |
| Machine Language Programming Made Simple | Review of Machine Language Programming Made Simple for your Sinclair ZX80 and ZX81. | Sinclair ZX80, Sinclair ZX81 |
| Nine Defenders Against the Aliens | Review of Quicksilva’s Defender. | Sinclair ZX80, Sinclair ZX81 |
| Perceptions | In this issue I will discuss the ZX80/81’s display system. The ZX80/81 video display is created almost entirely by software. All sync (vertical and horizontal) is generated by 10 instructions in the display routine. | Sinclair ZX80, Sinclair ZX81 |
| Plotting with 4K Basic | If you have only 1K of RAM, this program provides you with a field of 10 lines by 7 columns for plotting. Pixel graphics provide 280 plotting positions: the field is 20 pixels high by 14 pixels wide. | Sinclair ZX80, Type-in program |
| Resources (Sync v2 n2) | Listing of new user groups, books and other resources. | |
| Safe Machine Code Routines | More and more programs are appearing in SYNC, under the rubric of “machine language.” There was a time, not too long ago, when personal computer users were notoriously shy about venturing into these jungles. Nowadays, though, even someone who is not quite comfortable in Basic can manage to key in and run programs in Z80 | Sinclair ZX80, Sinclair ZX81 |
| Sync Notes | The Second ZX Microfair Report | Sinclair ZX80, Sinclair ZX81 |
| The Exploding Bookshelf | Books published about SincIair/MicroAce computers. | MicroAce, Sinclair ZX80, Sinclair ZX81 |
| Try This | Get a small AM radio and tune it for best response. Then press RUN and NEWLINE. Note the sound as you press NEWLINE. The display may be ignored. | Sinclair ZX80, Sinclair ZX81, Timex/Sinclair 1000, Type-in program |
| Understanding Floating-point Arithmetic, Part 2 | Describes the workings on the ‘third language’ of the 8K ROM – the CALCULATOR LANGUAGE – that is used to add, subtract, multiply, divide and generally manipulate floating-point numbers. | Sinclair ZX81, Timex/Sinclair 1000 |
