Download PDF by Rodnay Zaks: Advanced 6502 Programming

By Rodnay Zaks

ISBN-10: 089588089X

ISBN-13: 9780895880895

Publication through Zaks, Rodnay

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GENERATING SQUARE WAVES 9th Symphony: 5-5-6-B-B-6-5-4-3-3-4-5-5-4-4-D-55-6-B-B-6-5-4-3-3-4-5-4-3-3-D-4-45-3-4-6-5-3-4-6-5-4-3-4-D Clementine: 3-3-3-D-2-D-5-5-5-D-3-D-3-5-8-D-D8-6-5-4-D-D-D-4-5-6-D-6-D-5-4-5-D3-D-3-5-4-D-D-2-3-4-3 Frere Jacques: 3-4-5-3-3-4-5-3-5-6-8-D-5-6-8-D-BA-B-6-5-D-3-D-B-A-B-6-5-D-3-D-3-D2-D-3-D-D-D-3-D-2-D-3 Jingle Bells: 5-5-5-D-5-5-5-D-5-B-3-4-5-D-D-D-66-6-6-6-5-5-5-B-B-6-4-3 London Bridge: B-A-8-6-5-6-8-D-4-5-6-D-5-6-B-D-BA-B-6-5-6-B-D-4-D-B-D-5-3 Mary Had a Little Lamb: 5-4-3-4-5-5-5-D-4-4-4-D-5-B-8-D-54-3-4-5-5-5-5-4-4-5-4-3 Row Row Row Your Boat: 3-D-3-D-3-4-5-D-5-4-5-6-B-D-D-D-CC-B-B-5-5-3-3-8-6-5-4-3 SIient Night: B-D-D-A-B-D-5-D-D-D-B-D-D-A-B-D-5D-D-D-3-D-D-3-D-B-D-D-D-C-D-D-CD-B-D-D-C-D-8-5-8-D-6-D-4-D-3 Twinkle Twinkle Little Star: 3-3-B-8-A-A-B-D-6-6-5-5-4-4-3-D-BB-6-6-5-5-4-D-3-3-8-B-A-A-B-D-6-65-5-4-4-3 Fig.

If the player guesses correctly, the program switches to player 2. Otherwise, player 1 will be given another chance until his or her turn (17 seconds) is up. It should be noted here that for each number presented to the player, the total guessing time is accumulated to a maximum of about 17 seconds. When the maximum is reached, the bottom row will go blank and a new number will be displayed. 3. Once both players have had a turn to guess a binary digit, the program will signal 41 ADVANCED 6502 PROGRAMMING • ••• • 0 0 5 6 0 0 3 2 4 9 8 7 Fig.

It is easily derived from the equation that: note constant = loop index = (T - 2 x OD)/2 x ID The period may be expressed in function of the frequency as T or, in microseconds: T = 1/N = 10 /N 6 Finally, the above equation becomes: note constant = (106/N - 2 x OD)/2 x ID For example, let us compute the note constant corresponding to the frequency for middle C. 5. 62 Hertz. The "OD" delay has been shown above to be 13 microseconds, while "ID" was set to 10 microseconds. 62 - 26 6 20 = 190 (or BE in hexadecimal) It can be verified that this corresponds to the fourth entry in the table 26 GENERATING SQUARE WAVES NOTE NOTE BELOW MIDDLEC r : CONSTANT 'c BE D A9 E 96 FE MIDDLEC E2 i C9 F BE F# 86 G 7E G# 77 A 70 \B 64 NOTE CONSTANT ABOVE { MIDDLEC C 5E Fig.

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Advanced 6502 Programming by Rodnay Zaks

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