Titlebook: Discover Your VIC-20; A Beginner’s Guide t Donald Kahn,Nevin B. Scrimshaw Book 1983 Birkh?user Boston, Inc. 1983 BASIC.computer.design.prog

Volatile-Oils

ramming. Although most of the programs in this book are short (to save unnecessary typing on your part), they are the foundation for a complete understanding of BASIC programming that will enable you to build long programs de- signed to do exactly what you want them to do.978-1-4615-9818-3978-1-4615-9816-9

BOOST

BORE

Bookkeeping in Basic, BASIC stores data in .. Let’s experiment in direct mode to give you a feel for programming with numbers and variables. Clear the computer’s memory again by typing in NEW and then pressing [RETURN]. Clear the screen by pressing [SHIFT]:[CLR/HOME]. Type:

Infantry

Printing with Color,mode and a few commonly used BASIC statements in a program that will flash your name in blinking color down the screen. Since we’re going to issue several commands involving your name, we will store it in a string variable, in this case the string variable NAMES. You should type your name in place o

sorbitol

Contend

Music 1, program, we will see software that will enable the VIC to do just about everything an organ does. Programs already exist that can make the VIC sound like almost any instrument; such programs are beyond the scope of this book, but we can still do some impressive music-making.

DNR215

Microsurgery,l consider . and build an odd Hexmas tree out of one particular string. The BASIC language has powerful functions relating to number variables. Now we will teach the VIC to use another feature: the string variable.

野蠻

Game Making,ing experience, you’re now writing programs for the chores or diversions you envisioned when you bought the VIC. In this chapter we’re going to design a simple game program. It’s about 25 lines, and after you type it and RUN it, we’ll discuss it. However, first we should talk about program design.

跳動

analogous

Advanced Color,oves our centipede across the screen, back across the screen one line below, and repeats the action for a specified number of lines. While I won’t try to explain every detail of every line, hopefully you’ll see that the important lines (the ones with POKE statements) are tied together by an overall