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Routines |
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32279 | DI | Disable interrupts | ||
32280 | LD A,(HL) | Pick up a tune datum in A | ||
32281 | INC HL | Point HL at the next tune datum | ||
32282 | AND A | Is the tune finished? | ||
32283 | JR NZ,32290 | Jump if not | ||
32285 | INC A | Make the border blue | ||
32286 | OUT (254),A | |||
32288 | EI | Re-enable interrupts | ||
32289 | RET | |||
A non-zero tune datum has been found, meaning the tune is not finished yet.
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32290 | PUSH HL | |||
32291 | LD B,A | Copy the tune datum to B | ||
32292 | RRCA | Should we pause briefly (bit 0 set) here? | ||
32293 | JR NC,32304 | Jump if not | ||
32295 | LD DE,3840 | Pause briefly (this happens for all but one note in the theme tune, and for all notes in the 'all shields/safe' tune) | ||
32298 | DEC E | |||
32299 | JR NZ,32298 | |||
32301 | DEC D | |||
32302 | JR NZ,32298 | |||
32304 | AND 7 | 0<=A<=7 | ||
32306 | LD C,A | C=border colour for this note | ||
32307 | ADD A,A | Point HL at the appropriate entry in the note pitch/duration data table at 32263 | ||
32308 | ADD A,7 | |||
32310 | LD L,A | |||
32311 | LD H,126 | |||
32313 | LD A,B | A=original tune datum | ||
32314 | RLCA | Obtain the note frequency parameter in E and the note duration parameter in HL | ||
32315 | RLCA | |||
32316 | RLCA | |||
32317 | RLCA | |||
32318 | AND 15 | |||
32320 | LD B,A | |||
32321 | LD E,(HL) | |||
32322 | INC L | |||
32323 | LD A,(HL) | |||
32324 | LD HL,0 | |||
32327 | ADD HL,DE | |||
32328 | DJNZ 32327 | |||
32330 | RR H | |||
32332 | RR L | |||
32334 | LD E,A | |||
32335 | LD A,C | Produce a note | ||
32336 | OUT (254),A | |||
32338 | XOR 16 | |||
32340 | LD C,A | |||
32341 | LD B,E | |||
32342 | DJNZ 32342 | |||
32344 | DEC HL | |||
32345 | LD A,H | |||
32346 | OR L | |||
32347 | JR NZ,32335 | |||
32349 | POP HL | Restore the pointer to the tune data table | ||
32350 | JP 32280 | Pick up the next tune datum |
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