org 7c00h
bits 16
-data_start equ 7e00h
-nticks equ data_start
-tmoffs equ nticks + 4
-muscur equ tmoffs + 4
-data_end equ muscur + 4
-
-backbuf_seg equ 1000h
-
-OSC_FREQ equ 1193182
-PIT_DATA0 equ 40h
-PIT_CMD equ 43h
-PIT_CMD_CHAN0 equ 00h
-PIT_CMD_HILO equ 30h
-PIT_CMD_SQWAVE equ 06h
-KB_CTRL equ 61h
-
-%define DIV_ROUND(a, b) ((a) / (b) + ((a) % (b)) / ((b) / 2))
-
-%macro setcursor 2
- mov dl, %1
- mov dh, %2
+nticks equ 7e00h
+tmoffs equ 7e04h
+musptr equ 7e08h
+
+%macro setcur 2
+ mov dx, %1 | (%2 << 8)
xor bx, bx
mov ah, 2
int 10h
%endmacro
%macro spkon 0
- in al, KB_CTRL
+ in al, 61h
or al, 3
- out KB_CTRL, al
+ out 61h, al
%endmacro
%macro spkoff 0
- in al, KB_CTRL
+ in al, 61h
and al, 0fch
- out KB_CTRL, al
+ out 61h, al
%endmacro
-%macro settimer 2
- mov al, (PIT_CMD_CHAN0 + (%1 << 6)) | PIT_CMD_HILO | PIT_CMD_SQWAVE
- out PIT_CMD, al
+%macro stimer 2
+ mov al, (%1 << 6) | 36h
+ out 43h, al
mov ax, %2
- out PIT_DATA0 + %1, al
+ out 40h + %1, al
mov al, ah
- out PIT_DATA0 + %1, al
+ out 40h + %1, al
%endmacro
-start: xor eax, eax
+start: xor ax, ax
mov ds, ax
mov es, ax
mov ss, ax
mov sp, 7c00h
- mov di, data_start
- mov cx, (data_end - data_start) / 2
+ mov di, nticks
+ mov cx, 6
rep stosw
- mov word [32], timer_intr
+ mov word [32], tintr
mov [34], ax
- settimer 0, DIV_ROUND(OSC_FREQ, 200)
+ stimer 0, 5966
mov ax, 13h
int 10h
- push backbuf_seg
+ push 0a000h
pop es
+ setcur 10, 0
+ mov si, str1
+ call textout
+ setcur 12, 1
+ mov si, str2
+ call textout
+
sti
mainloop:
- call drawbg
-
mov dx, 3dah
.invb: in al, dx
and al, 8
- jnz mainloop
+ jnz .invb
.novb: in al, dx
and al, 8
jz .novb
- push ds
- push es
- push es
- pop ds
- push 0a000h
- pop es
- xor di, di
- xor si, si
- mov cx, 32000
- rep movsw
- pop es
- pop ds
-
- setcursor 10, 0
- mov si, str1
- call textout
- setcursor 12, 1
- mov si, str2
- call textout
+ call drawbg
jmp mainloop
.fillgrad:
mov ax, bx
mov ah, al
- mov cx, 3680 ; 20 lines
+ mov cx, 2400 ; 15 lines
rep stosw
inc bx
cmp bx, 208
fiadd word [w5]
fimul word [w5]
fistp word [bp - 2]
- fistp word [bp - 4]
+ fstp st0
mov bx, [bp - 2]
add bx, 100
imul bx, bx, 320
add bx, cx
+.mntcol:
mov byte [es:bx], 0
+ add bx, 320
+ cmp bx, 64000
+ jb .mntcol
+
dec cx
jnz .mnt
jmp textout
.done: ret
-timer_intr:
+tintr:
pusha
mov ax, [nticks]
inc ax
mov [nticks], ax
+ mov bx, [musptr]
+ cmp bx, 23*3
+ jnz .skiploop
+ xor bx, bx
+ mov [tmoffs], ax
+.skiploop:
+ xor cx, cx
+ mov cl, [music + bx]
+ shl cx, 4
sub ax, [tmoffs]
-.pmus: mov bx, [muscur]
- shl bx, 2
- mov cx, [music + bx] ; event time
- cmp cx, 0ffffh
- jz .loop
cmp ax, cx
jb .eoi
- inc dword [muscur]
- mov ax, [music + 2 + bx] ; event counter reload
+ mov ax, [music + 1 + bx]
+ add bx, 3
+ mov [musptr], bx
test ax, ax
jz .off
mov bx, ax
- settimer 2, bx
+ stimer 2, bx
spkon
jmp .eoi
.off: spkoff
.eoi: mov al, 20h
- out 20h, al ; EOI
+ out 20h, al
popa
iret
-.loop: neg cx
- mov [muscur], cx
- mov ax, [nticks]
- mov [tmoffs], ax
- jmp .pmus
-
-
-str1: db 'message message blah',0
+str1: db 'message blah',0
str2: db 'Michael & Athena',0
-G2 equ 24351/2
-C3 equ 18243/2
-D3 equ 16252/2
-B2 equ 19328/2
-F3 equ 13666/2
-E3 equ 14479/2
-
-%define TM(x) (40 + (x) * 4)
-
-music: dw 0, 0
- dw TM(0), G2
- dw TM(40), C3
- dw TM(70), C3
-
- dw TM(80), C3
- dw TM(140), 0
-
- dw TM(160), G2
- dw TM(200), D3
- dw TM(230), B2
+music: dd 0a2f8f00h, 0a11123a1h, 23a11423h, 28000023h, 0be322f8fh, 25c0391fh
+ dd 4b23a13ch, 8f500000h, 23a15a2fh, 641ab161h, 476e1ab1h, 1fbe751ch
+ dd 8223a178h, 0a18925c0h, 1fbe8c23h, 0aa0000a0h
+ dw 0
- dw TM(240), C3
- dw TM(300), 0
-
- dw TM(320), G2
- dw TM(360), C3
- dw TM(390), F3
-
- dw TM(400), F3
- dw TM(440), E3
- dw TM(470), D3
-
- dw TM(480), C3
- dw TM(520), B2
- dw TM(550), C3
-
- dw TM(560), D3
- dw TM(640), 0
-
- dw TM(680), 0
- dw 0ffffh, 0
+w5: dw 5
+w30: dw 30
times 446-($-$$) db 0
dd 00212080h
dd 00000800h
dd 0001f800h
-w5: dw 5
-w30: dw 30
times 510-($-$$) db 0
dw 0aa55h