Discover Your VIC-20: A Beginner’s Guide to Real Programming by Donald Kahn Jr., Nevin B. Scrimshaw (auth.)

By Donald Kahn Jr., Nevin B. Scrimshaw (auth.)

This e-book is a easy uncomplicated programming textual content. meant essentially for newcomers, skilled programmers will also discover a few issues of in­ terest. The VIC-20 is a straightforward and straightforward to exploit desktop which may be coupled with this publication to supply probably the main trouble-free and least intimidating creation to programming attainable. This ebook is designed to enrich, now not exchange, the USER'S consultant that's integrated within the VIC-20 package deal. The USER'S consultant is basically an advent to the VIC-20 whereas this booklet is basically an creation to programming. some of the on hand desktop manuals comprise dozens of lengthy seasoned­ grams for the reader to style in and use, yet these courses do not unavoidably extra one's figuring out of programming. even though many of the courses during this e-book are brief (to keep pointless typing in your part), they're the basis for an entire realizing of uncomplicated programming that would allow you to construct lengthy courses de­ signed to just do what you will have them to do.

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If so, the counter CO gets bumped up by one. Now we close off the big loop and calculate the estimated probability. 3 means 30 percent probable and so forth. These lines close the outer loop and compute the statistics. 80 NEXTTR 90 P = eOl5 100 PRINT "THE ESTIMATED PROBABILITY IS";P 105 PRINT RUN the program. Do we have a bug? The answer you get looks suspicious. Has something gone wrong? Our counter ET did not come home after the first pass. Add the following line: 75 ET =0 This line initializes the counter ET back to 0 so that it is ready to count again.

Writing a game (or any program) in machine language is slow and exacting work. Assembly language is a bit easier, as it has a set of mnemonics for the machine code commands. One BASIC statement might require ten commands in assembly, but machine code is executed far faster than BASIC so the net result is a significant increase in speed. When the VIC executes a BASIC statement, it first has to translate it into machine code commands, and this takes time. As you go from BASIC to ASSEMBLY to MACHINE you go easy but slow to manageable to torture but fast.

Hitting the down cursor ends the program, after turning off the volume. ) No longer do we need to hit [RUN/STOP] to get out of this program! 29 is ASC for the right cursor. Hitting this key turns off the volume, but doesn't turn off the voices; so the next note key hit after this one will give an interesting effect. Code numbers 133-135 (Lines 160 to 180) turn off the individual voices; 133 is ASC for F1, 134 is ASC for F3, and 135 is ASC for F5. ) Line 150 instructs the computer to skip Lines 160 to 180 if M < 130, since all the other keys in use here have ASC codes that are less than 130.

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