data_start equ 7e00h
nticks equ data_start
-muscur equ nticks + 4
-spkstat equ muscur + 4
-vol equ spkstat + 4
+tmoffs equ nticks + 4
+muscur equ tmoffs + 4
+data_end equ muscur + 4
-osc_freq equ 1193182
+backbuf_seg equ 1000h
+
+OSC_FREQ equ 1193182
PIT_DATA0 equ 40h
PIT_CMD equ 43h
PIT_CMD_CHAN0 equ 00h
out PIT_DATA0 + %1, al
%endmacro
- xor eax, eax
+start: xor ax, ax
mov ds, ax
+ mov es, ax
mov ss, ax
mov sp, 7c00h
- mov [nticks], eax
- mov [muscur], eax
- ;mov [spkstat], eax
- ;mov word [vol], 04h
+ mov di, data_start
+ mov cx, (data_end - data_start) / 2
+ rep stosw
+
mov word [32], timer_intr
- mov word [34], 0
+ mov [34], ax
- settimer 0, DIV_ROUND(osc_freq, 100)
+ settimer 0, DIV_ROUND(OSC_FREQ, 200)
mov ax, 13h
int 10h
- mov ax, 0a000h
- mov es, ax
+ push backbuf_seg
+ pop es
- mov ax, 0303h
- mov cx, 32000
+ sti
+
+mainloop:
+ call drawbg
+
+ mov dx, 3dah
+.invb: in al, dx
+ and al, 8
+ jnz mainloop
+.novb: in al, dx
+ and al, 8
+ jz .novb
+
+ push ds
+ push es
+ push es
+ pop ds
+ push 0a000h
+ pop es
xor di, di
- rep stosw
+ xor si, si
+ mov cx, 32000
+ rep movsw
+ pop es
+ pop ds
- setcursor 10, 12
+ setcursor 10, 0
mov si, str1
call textout
- setcursor 12, 13
+ setcursor 12, 1
mov si, str2
call textout
- sti
+ jmp mainloop
+
+drawbg:
+ mov bx, 200
+ mov di, 5120
+.fillgrad:
+ mov ax, bx
+ mov ah, al
+ mov cx, 2400 ; 15 lines
+ rep stosw
+ inc bx
+ cmp bx, 208
+ jnz .fillgrad
+
+ ; mountains
+ mov cx, 320
+ mov bp, sp
+.mnt: mov [bp - 2], cx
+ fild word [bp - 2]
+ fidiv word [w30]
+ fsincos
+ fiadd word [w5]
+ fimul word [w5]
+ fistp word [bp - 2]
+ ;fistp word [bp - 4]
+ 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
+
+ ret
-infloop:
- hlt
- jmp infloop
textout:
mov al, [si]
and al, al
jz .done
mov ah, 0eh
- mov bx, 0fh
+ mov bx, 82
int 10h
inc si
jmp textout
.done: ret
timer_intr:
+ pusha
mov ax, [nticks]
inc ax
mov [nticks], ax
- mov bx, [muscur]
+ sub ax, [tmoffs]
+.pmus: mov bx, [muscur]
shl bx, 2
mov cx, [music + bx] ; event time
cmp cx, 0ffffh
- jz .off
+ jz .loop
cmp ax, cx
- jb .dopwm
+ jb .eoi
- inc dword [muscur]
+ inc word [muscur]
mov ax, [music + 2 + bx] ; event counter reload
test ax, ax
jz .off
mov bx, ax
settimer 2, bx
spkon
- mov word [spkstat], 1
- jmp .dopwm
-
-.off: spkoff
- mov word [spkstat], 0
jmp .eoi
- ; PWM for volume control
-.dopwm: jmp .eoi
- spkoff
- mov ax, [spkstat]
- test ax, ax
- jz .eoi
- mov ax, [nticks]
- and ax, 0fh
- cmp ax, [vol]
- jae .pwmoff
- spkon
- jmp .eoi
-.pwmoff:
- spkoff
+.off: spkoff
.eoi: mov al, 20h
out 20h, al ; EOI
+ popa
iret
+.loop: neg cx
+ mov [muscur], cx
+ mov ax, [nticks]
+ mov [tmoffs], ax
+ jmp .pmus
+
+
str1: db 'message message blah',0
-str2: db 'Michael & Athina',0
-
-music:
- dw 0, 2000
- dw 10, 1900
- dw 20, 1800
- dw 30, 1700
- dw 40, 1600
- dw 50, 1500
- dw 60, 1400
- dw 70, 1300
- dw 80, 1200
- dw 90, 1100
- dw 100, 1000
- dw 110, 1100
- dw 120, 1200
- dw 130, 1300
- dw 140, 1400
- dw 150, 1500
- dw 160, 1600
- dw 170, 1700
- dw 180, 1800
- dw 190, 1900
- dw 200, 2000
- dw 210, 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
+
+ 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
times 446-($-$$) db 0
dd 0820280ch
dd 00000800h
dd 0001f800h
+
+w5: dw 5
+w30: dw 30
times 510-($-$$) db 0
dw 0aa55h
projects / bootcard / blobdiff