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sound.asm
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; BSD 2-Clause License
;
; Copyright (c) 2020-2022, timre13
; All rights reserved.
;
; Redistribution and use in source and binary forms, with or without
; modification, are permitted provided that the following conditions are met:
;
; 1. Redistributions of source code must retain the above copyright notice, this
; list of conditions and the following disclaimer.
;
; 2. Redistributions in binary form must reproduce the above copyright notice,
; this list of conditions and the following disclaimer in the documentation
; and/or other materials provided with the distribution.
;
; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
; DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
; SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
; CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
; OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;***********************************************;
;***********************************************;
play_bouncing_sound:
mov al, 0b10110110 ; Set up the PIT
out 0x43, al
mov al, 0x00 ; Amplitude low byte
out 0x42, al
mov al, 0x90 ; Amplitude high byte
out 0x42, al
in al, 0x61
or al, 3
out 0x61, al ; Enable the speaker
ret
;***********************************************;
;***********************************************;
play_game_over_sound:
mov al, 0b10110110 ; Set up the PIT
out 0x43, al
mov al, 0x00 ; Amplitude low byte
out 0x42, al
mov al, 0x40 ; Amplitude high byte
out 0x42, al
in al, 0x61
or al, 3
out 0x61, al ; Enable the speaker
ret
;***********************************************;
;***********************************************;
stop_playing_sound:
in al, 0x61
and al, ~3
out 0x61, al
ret