Jon T. Passler

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.

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.

Improvements to author’s program.

8K ROM version of game published in earlier issue.

Renumbering by a USR Routine; Sweeper; Ed, the Head.

Mousetrap; Unvader; Draw and Store; Number Nine; Eliminator

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.

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.

Listing of new user groups, books and other resources.

The 8K ROM’s floating point decimal is great, but sometimes you don’t need 9 decimal places.

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.

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.

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.