By Rodnay Zaks
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Additional info for Advanced 6502 Programming
The tone generation routine is shown below: TONE FL2 FLl STA LDA STA LDA LDX LDY DEY CLC BCC BNE EOR STA DEX BNE RTS FREQ #$FF DDRB #$00 DUR F~:QJ FLl #$FF OPB INNER LOOP OUTER LOOP FL2 Note the "classic" nested loop design. Every time it is entered, the outer loop adds an additional thirteen microseconds delay: 14 microseconds for the extra instructions (LDY, EOR, STA, DEX, and 25 ADVANCED 6502 PROGRAMMING BNE), minus one microsecond for responding to the unsuccessful inner loop branch. The total outer loop delay introduced is therefore: (loop index) x 10 + 13 microseconds Remember that one pass through the outer loop represents only a halfperiod for the note.
At the end of the match, control is returned to the SYM-1 monitor. A TYPICAL GAME The right arrow lights up. The following LED pattern appears at the bottom: 10, 13, 14, 15. The player on the right (player 1) pushes key 42 PSEUDO RANDOM NUMBER GENERATOR ''C,'' and the bottom row of LEDs goes blank, as the answer is incorrect. Because player 1 did not guess correctly and he or she still has time left in this turn, a new number is offered to player 1. " He or she wins and now the left arrow lights up, indicating that it is player 2's turn.
All data and constants are stored in tables. Timing is implemented by nested loops. Indexed addressing techniques are used to store and retrieve data. Sound is generated by a square wave. EXERCISES Exercise 2-4: Change the note constants to implement a different range of notes. Exercise 2-5: Store a tune in memory in advance. " Exercise 2-6: Rewrite the program so that it will store the note and duration constants in memory when they are entered, and will not need to look them up when the tune is played.
Advanced 6502 Programming by Rodnay Zaks