Knight Lore: Routine at 46105

46105: Play Appearing Sound

Used by the routine at HandlePlayerAppearing.

Plays the rising sound of the sparkles that show the player appearing. The number of cycles depends on the sprite number of the sparkle.

Input
IX	Address of the sparkle object

Make a beep for each remaining frame.

PlayAppearingSound

46105

LD A,(IX+0)

Fetch the graphic number of the sparkle.

46108

RLCA

Rotate it left twice.

46109

RLCA

46110

AND %00011111

Keep the lowest five bits.

46112

OR %00000011

Make sure that there are at least three cycles.

46114

LD C,A

Set C to the number of cycles.

PlayAppearingSound_NextBeep

46115

LD A,C

Fetch the cycle counter.

46116

RLCA

Multiply it by four to get the pitch.

46117

RLCA

46118

LD B,A

Set B to the pitch.

46119

Play a single cycle of the tone.

46122

DEC C

Decrease the cycle counter and loop back to PlayAppearingSound_NextBeep until it is zero.

46123

46125

RET

Return.

View the equivalent code in;