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str_abeyance.asm
181 lines (163 loc) · 2.69 KB
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str_abeyance.asm
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; | | |
; | . . | . . . |
; a b e y a n c e
;
; designed for 286 12.5 MHz
; run in DosBox 3000 cycles
;
; calamity 256 vol.4
; | |
; zden satori 2016
.model tiny
.code
.286
org 100h
start:
mov al, 13h
int 10h
mem2:
push 0a000h
was:
pop es
push es
pop ds
; --- snd
mov al, 90h
mem4:
out 43h, al
in al, 61h
mem1:
or al, 3
out 61h, al
mov cx, 32
pal:
mov al, cl
mov dx, 03c8h
out dx, al
inc dx
out dx, al
ror al, 1
out dx, al
ror al, 1
out dx, al
loop pal
frame_loop:
;---------
mov ax,cx
shr ax,0
shift2:
call _sin
cmp cx, 65000
val1:
jb jpp
mov bx, [di+1025]
off1:
shr al, 4
shr bl, 4
add al, bl
jpp:
call sound
mov [si],al
inc si
inc di
add cx, 4
jnz noset
; -----------------------------------------------------------------------
call pix_do
cmp byte ptr cs:[was-1], 3
jnz cont
mov si, 256
xor di, di
cont:
; -----------------------------
call _rnd
jc noccc
and al,5
mov byte ptr cs:[shift-1],al
noccc:
mov word ptr cs:[val1-2],bx
cmp bl, 124
ja aaaa
call _rnd
mov cx, bx
shr cx, 4
shift:
cmp bl, 124
jb bbb
rep movsw
jmp aaaa
bbb:
rol byte ptr cs:[shift2-1],1
shr cx,1
shup:
xor byte ptr cs:[shup-1],1
rep stosw
aaaa:
inc byte ptr cs:[was-1]
and byte ptr cs:[was-1],15
noset:
xor ax, ax
in al, 60h
dec ax
jnz short frame_loop
; 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
_rnd:
; ------------------ random
mov al,16
r_loop: rol bp,1
jnc r_skip
xor bp,0ah
r_skip: dec al
jne r_loop
mov bx,bp
ret
; -----------------------------
sound:
mov dl,[di-1023]
add al,dl
out 42h,al
ret
; -----------------------------
pix_do:
shr al,1
push si
push di
mov di,[si]
mov dh, 32
pix_rows:
mov bl, 8
pix_row_rep:
mov dl, 8
mov ah, [si]
pix_more:
shl ah, 1
jc pix_write
xor al,255
pix_write:
mov cl, 8
rep stosb
pix_skip:
dec dl
jnz pix_more
adc di, 320-(8*8)
dec bl
jnz pix_row_rep
dec al
inc si
dec dh
jnz pix_rows
pop di
pop si
ret
end start