Routines
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63195: Music: Theme Tune
Used by the routine at Handler_Interrupts.
MusicThemeTune 63195 LD A,(65528) Jump to MusicThemeTune_Housekeeping if *MusicOnOff is equal to 0.
63198 CP 0
63200 JR Z,MusicThemeTune_Housekeeping
63202 PUSH BC Stash BC on the stack.
63203 LD A,(65160) C=*InterruptCounter.
63206 LD C,A
63207 LD A,(65527) A=*65527.
63210 AND C Merge the bits from C.
63211 POP BC Restore BC from the stack.
63212 JR NZ,MusicThemeTune_Housekeeping Jump to MusicThemeTune_Housekeeping if {} is not zero.
63214 PUSH BC Stash BC, DE and HL on the stack.
63215 PUSH DE
63216 PUSH HL
63217 LD HL,(65529) HL=*MusicPointerThemeMusic.
63220 LD A,(HL) Fetch a byte of music data and store it in A.
Are we at the end?
63221 CP 255 Jump to MusicResetThemeTune if the termination character (255) has been reached.
63223 JP Z,MusicResetThemeTune
63226 LD E,A E=the music data byte from A.
63227 INC HL Increment the music data pointer by one.
63228 LD A,(HL) D=*HL.
63229 LD D,A
63230 INC HL Increment music data pointer by one.
63231 LD A,(HL) C=*HL.
63232 LD C,A
63233 INC HL Increment music data pointer by one.
63234 LD A,(HL) B=*HL.
63235 LD B,A
63236 INC HL Increment the music data pointer by one and write it to *MusicPointerThemeMusic ready for the next interrupt generation.
63237 LD (65529),HL
63240 LD A,E Jump to MusicThemeTune_NoNote if DE is zero.
63241 OR D
63242 JR Z,MusicThemeTune_NoNote
63244 CALL PlayWave1 Call PlayWave1.
MusicThemeTune_NoNote 63247 POP HL Restore HL, DE and BC from the stack.
63248 POP DE
63249 POP BC
MusicThemeTune_Housekeeping 63250 POP AF Restore AF and AF from the stack.
63251 POP AF
63252 CALL 56 Call MASK_INT.
63255 POP IY Restore IY from the stack.
63257 EI Enable interrupts.
63258 RET Return.
Resets the theme tune pointer back to the beginning of the data.
MusicResetThemeTune 63259 LD HL,64000 Write MelodyData_ThemeTune to *MusicPointerThemeMusic.
63262 LD (65529),HL
63265 JR MusicThemeTune_NoNote Jump to MusicThemeTune_NoNote.
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