An Introduction to the Commodore 64: Adventures in by Nevin B. Scrimshaw, James Vogel (auth.) PDF

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By Nevin B. Scrimshaw, James Vogel (auth.)

ISBN-10: 1489967877

ISBN-13: 9781489967879

ISBN-10: 1489967893

ISBN-13: 9781489967893

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Extra info for An Introduction to the Commodore 64: Adventures in Programming

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As you see, the maximum Attack does not necessarily mean maximum sound. Now try the Decay settings 15, 9, 4, 0. After that, try a few combinations such as 240 and 15, or 128 and 9. As you can hear, they are all different.

If you look at Line 1000, you will notice we only POKEd three of the eight shape registers. Add a couple of lines to this program and try POKEing other values into the last five shape registers. COUNTING WITH TWO FINGERS Before we go on, we need to understand a little more about the computer's counting system. Believe it or not, there's more than one way 38 to count to 10. People have 10 fingers, so through the ages we've developed a number system with 10 digits ("digit" even means finger): 0, 1,2, 3, 4, 5, 6, 7, 8, and 9.

Now type 137. Hit [RETURN] to enter the change. Now change the 89 to a 128: Bring the cursor over the 8 of 89; press [SHIFT]:[INST/DEL], and type 128. Press [RETURN]. Note that once you command the computer to make room for an INSerT, you must fill the space even if you only hit the space bar. If you attempt to use DELete to correct what you're inserting, you will print the reversed field graphic symbol for DELete. Now for a surprise. On a new line, type LIST - 40 again. You should now have a blank line between Lines 30 and 40.

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An Introduction to the Commodore 64: Adventures in Programming by Nevin B. Scrimshaw, James Vogel (auth.)


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