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str_deadbeef.asm
190 lines (162 loc) · 2.63 KB
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str_deadbeef.asm
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; | | |
; | . . . | . . |
; d e a d b e e f
;
; designed for 286 12.5 MHz
; run in DosBox 3000 cycles
;
; calamity 256 vol.3
; | |
; zden satori 2016
.model tiny
.code
.286
org 100h
start:
mov al, 13h
int 10h
mem2:
mov si, offset pal_data
mov bx, 0004h
pal_l:
mov cx, 64
pal:
mov dx, 03c8h
mov al, bh
out dx, al
inc dx
mov al, cl
and al, [si]
out dx, al
mov al, cl
and al, [si+1]
out dx, al
mov al, cl
and al, [si+2]
out dx, al
inc bh
loop pal
add si, 3
dec bl
jnz pal_l
push 0a000h
pop es
push es
pop ds
; --- snd
mov al, 90h
mem4:
out 43h, al
in al, 61h
mem1:
or al, 3
out 61h, al
xor cx,cx
mov si, 256
xor di,di
frame_loop:
;---------
mov ax,cx
call _sin
add al, 26
nop
nop
nop
mov dl,[di-180]
data_sound:
add al,dl
out 42h,al
mov [si],al
inc di
inc si
inc cx
jnz noset
cmp bx, [si]
jb p1
call pix_do2
mov word ptr cs:[data_sound-2],-170
jmp p2
p1:
push si
mov dh, 16
pix_rows:
mov bl, 16
pix_row_rep:
mov dl, 8
mov ah, [si]
pix_more:
shl ah, 1
jc pix_write
add di, 16
jmp pix_skip
pix_write:
mov cx, 16
rep stosb
pix_skip:
dec dl
jnz pix_more
add di, 320-(16*8)
dec bl
jnz pix_row_rep
inc si
dec dh
jnz pix_rows
pop si
mov word ptr cs:[data_sound-2],-180
p2:
noset:
xor ax, ax
; ESC check
in al, 60h
dec ax
jnz short frame_loop
in al, 61h
and al, 11111100b
out 61h, al
mov al, 3h
int 10h
ret
; sin by Baudsurfer - http://olivier.poudade.free.fr/arc/tinysine.zip
_sin:
mov bx,ax ; al=bl=x
imul bl ; ax=x*x
mov al,ah ; ax=x*x*256+x%256
imul bl ; ax=x*(x*x*256+x%256)
mov al,ah ; ax=(x*(x*x*256+x%256))*256+(x*(x*x*256+x%256))%256
shr bx,2 ; bx=x/4
add al,13 ; ax=13+(x*(x*x*256+x%256))*256+(x*(x*x*256+x%256))%256
sub ax,bx ; ax=-x/4+100+(x*(x*x*256+x%256))*256+(x*(x*x*256+x%256))%256
db 0d4h,64 ; ax=(-x/4+100+(x*(x*x*256+x%256))*256+(x*(x*x*256+x%256))%256)%64
ret
; -----------------------------------------
pix_do2:
push si
mov dh, 16
pix_rows2:
mov bl, 16
pix_row_rep2:
mov dl, 8
mov al, [si]
pix_more2:
shr al, 1
jc pix_write2
add di, 16
jmp pix_skip2
pix_write2:
mov cx, 16
rep stosb
inc si
pix_skip2:
dec dl
jnz pix_more2
add di, 320-(16*8)
dec bl
jnz pix_row_rep2
dec dh
jnz pix_rows2
pop si
ret
; --------
pal_data: db 255,0,0, 63,47,0, 63,0, 0deh, 0adh,0beh,0efh
db 'Z'
end start