By Nevin B. Scrimshaw, James Vogel (auth.)
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Extra info for An Introduction to the Commodore 64: Adventures in Programming
Once you get your program running properly , SAVE it by typing on a new line: SAVE "THE FIFTH" ,8 for the disk drive, or just SAVE "THE FIFTH" for DATASSEITE storage. " Meanwhile, let's take the Fifth and amend it. 22 ADDING, ERASING AND RENUMBERING You've seen how easy it is to use LIST to help make changes in existing program lines. Adding and erasing lines is even easier. To add a line, just type in a numbered line after the READY prompt followed by [RETURN]. To erase, type the line number on an empty line immediately followed by [RETURN].
The control is built around the numbers 1,2,4,8, 16, 32,64, and 128, the decimal equivalents of the bits in the voices' address register. The first four numbers control the Decay; the last four numbers, the Attack. , 0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240; 240 is the maximum Attack setting. You can also add any, all or none of your Decay numbers; thus, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 are all possible Decay settings. To encode your final setting, add the Attack number to the Decay and enter the sum; the computer will do the rest.
Let's say you mistyped a letter, and your line looked like this: 69 READ A,B,C,D,E,F,V Because the format, or syntax, of this command is correct, the computer will not find a syntax error, and will run the program. The program will work fine until it reaches V, then it will END, and the computer won't give you any hint of what went wrong. If this happens, you'll need to do more sophisticated debugging than you're using in this chapter. ) For now, however, let's concentrate on the editing. Bring the cursor up to the V and change it to a G.
An Introduction to the Commodore 64: Adventures in Programming by Nevin B. Scrimshaw, James Vogel (auth.)