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;; ;;
;; PLAYNOTE.INC version 1.1 22 November 2003 ;;
;; ;;
;; Player Notes for Speaker PC ;;
;; subfunction #55 from function #55 Menuet OS ;;
;; ;;
;; Copyright 2003 VaStaNi ;;
;; vastani@ukr.net ;;
;; >>>- SIMPLY - QUICKLY - SHORTLY -<<< ;;
;; ;;
;; Note: playnote.txt ;;
;; ;;
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kontrOctave dw 0x4742, 0x4342, 0x3F7C, 0x3BEC, 0x388F, 0x3562
dw 0x3264, 0x2F8F, 0x2CE4, 0x2A5F, 0x2802, 0x25BF
memAdrNote dd 0
pidProcessNote dd 0
slotProcessNote dd 0
count_timer_Note dd 1
mem8253r42 dw 0
countDelayNote db 0
playNote:
; jmp NotPlayNotes
mov esi, [memAdrNote]
or esi, esi ; ESI = 0 ? - OFF Notes Play ?
jz NotPlayNotes ; if ESI = 0 -> ignore play pocedure
cmp eax, [count_timer_Note]
jb NotPlayNotes
push eax
inc eax
mov [count_timer_Note], eax
mov al, [countDelayNote]
dec al ; decrement counter Delay for Playing Note
jz NewLoadNote@Delay
cmp al, 0xFF ; this is first Note Play ?
jne NextDelayNote
;This is FIRST Note, save counter channel 2 chip 8253
mov al, 0xB6 ; control byte to timer chip 8253
out 0x43, al ; Send it to the control port chip 8253
in al, 0x42 ; Read Lower byte counter channel 2 chip 8253
mov ah, al ; AH = Lower byte counter channel 2
in al, 0x42 ; Read Upper byte counter channel 2 chip 8253
mov [mem8253r42], ax ; Save counter channel 2 timer chip 8253
NewLoadNote@Delay:
cld
; lodsb ; load AL - counter Delay
call ReadNoteByte
or al, al ; THE END ?
jz EndPlayNote
cmp al, 0x81
jnc NoteforOctave
mov [countDelayNote], al
; lodsw ; load AX - counter for Note!
call ReadNoteByte
mov ah,al
call ReadNoteByte
xchg al,ah
jmp pokeNote
EndPlayNote: ; THE END Play Notes!
in al, 0x61 ; Get contents of system port B chip 8255
and al, 0xFC ; Turn OFF timer and speaker
out 0x61, al ; Send out new values to port B chip 8255
mov ax, [mem8253r42] ; memorize counter channel 2 timer chip 8253
xchg al, ah ; reverse byte in word
out 0x42, al ; restore Lower byte counter channel 2
mov al, ah ; AL = Upper byte counter channel 2
out 0x42, al ; restore Upper byte channel 2
xor eax, eax ; EAX = 0
mov [memAdrNote], eax ; clear header control Delay-Note string
NextDelayNote:
mov [countDelayNote], al ; save new counter delay Note
pop eax
NotPlayNotes:
RET
NoteforOctave:
sub al, 0x81 ; correction value for delay Note
mov [countDelayNote], al ; save counter delay this new Note
; lodsb ; load pack control code
call ReadNoteByte
cmp al, 0xFF ; this is PAUSE ?
jne packCode ; no, this is PACK CODE
in al, 0x61 ; Get contents of system port B chip 8255
and al, 0xFC ; Turn OFF timer and speaker
out 0x61, al ; Send out new values to port B chip 8255
jmp saveESI
packCode:
mov cl, al ; save code
and al, 0xF ; clear upper bits
dec al ; correction
add al, al ; transform number to offset constant
movsx eax, al ; EAX - offset
add eax, dword kontrOctave ; EAX - address from constant
mov ax, [eax] ; read constant
shr cl, 4 ; transform for number Octave
shr ax, cl ; calculate from Note this Octave!
pokeNote:
out 0x42, al ; Lower byte Out to channel 2 timer chip 8253
mov al, ah
out 0x42, al ; Upper byte Out to channel 2 timer chip 8253
in al, 0x61 ; Get contents of system port B chip 8255
or al, 3 ; Turn ON timer and speaker
out 0x61, al ; Send out new values to port B chip 8255
saveESI:
; mov [memAdrNote], esi ; save new header control Delay-Note string
pop eax
RET
ReadNoteByte:
;result:
; al - note
push eax
push ebx
push ecx
push edx
mov eax,[pidProcessNote]
call pid_to_slot
test eax,eax
jz .failed
lea ebx,[esp+12]
mov ecx,1
mov edx,[memAdrNote]
inc [memAdrNote]
call read_process_memory
.failed:
pop edx
pop ecx
pop ebx
pop eax
ret
;------------------- END CODE -------------------