| Dear Editor | Semantics about baud vs bits per second; keyboard conversions; solving heat build-up; Timex modem compatibility with ZX80; renumbering program; conversion to ASCII; install RAM pack inside ZX81; interface Selectric typewriter. | |
| DEF on the Sinclair | One way around DEFine in Sinclair Basic is to replace all FN calls with the expression in the definition. This often requires breaking down an equation to simplify it. | Sinclair ZX81, Type-in program |
| Defensive Awari | Improvements to author’s program. | Sinclair ZX81, Type-in program |
| Fifteen Puzzle | 8K ROM version of game published in earlier issue. | Timex/Sinclair 1000, Type-in program |
| Just for Fun | Renumbering by a USR Routine; Sweeper; Ed, the Head. | Sinclair ZX80, Sinclair ZX81, Type-in program |
| Just For fun | Mousetrap; Unvader; Draw and Store; Number Nine; Eliminator | Sinclair ZX81, Type-in program |
| Letters | REM on the 4K ROM; Mini-Billboard for 8K ROM; “Bar Charts” and Rubber Cement; Splitting Strings; Short Video Cable; The 5-6 Seconds of Silence. | Sinclair ZX80, Sinclair ZX81 |
| Linear Regression | Computes the linear relationship between two sets of variables, expressed as the linear regression equation, and calculates the coefficient of determination, an indicator of the strength of the relationship. Given a set of two variables labelled X and Y, the program will yield an equation describing Y as a function of X. | Sinclair ZX80, Sinclair ZX81, Type-in program |
| Resources (Sync v1 n5) | Listing of new user groups, books and other resources. | |
| Rounding off Routine | The 8K ROM’s floating point decimal is great, but sometimes you don’t need 9 decimal places. | Sinclair ZX81, Type-in program |
| Search and Replace Routines | The routines in are designed to search through a program and replace all occurrences of one character or keyword with another (keywords are represented with one byte, too). The routines can all be entered directly from the keyboard into a 1 REM line. | Sinclair ZX81, Timex/Sinclair 1000, Type-in program |
| Setting Up Bar Charts | This program listed works with 1K to chart two years of monthly checking account balances with vertical bars. The graph is set up for a range of $0 to $1500, but can be modified for other ranges with a few changes and some trial-and-error experimentation. | Sinclair ZX80, Type-in program |
| Setting Up Bar Charts | This program listed works with 1K to chart two years of monthly checking account balances with vertical bars. The graph is set up for a range of $0 to $1500, but can be modified for other ranges with a few changes and some trial-and-error experimentation. | Sinclair ZX80, Type-in program |
