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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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