Difference between revisions of "Game of Life 32b"

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(Original version : 65 bytes)
Line 72: Line 72:
 
End    Start  
 
End    Start  
 
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== Switching to Textmode : 39 bytes==
 
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==Remove key handler and RNG : 44 bytes==
 
==Remove key handler and RNG : 44 bytes==
 
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         ; inc    si              ; Loop while not zero  
 
         ; inc    si              ; Loop while not zero  
 
         jmp short    LifeLoop  
 
         jmp short    LifeLoop  
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== Switching to Textmode : 39 bytes==
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Revision as of 07:26, 30 April 2020

Original version : 65 bytes

We'll start with the old 65 bytes version and bring it down to 32 bytes.

; http://read.pudn.com/downloads208/sourcecode/asm/981812/LIFE65.ASM__.htm
; Life simulator, 72 bytes  - Vladislav Kaipetsky and Tenie Remmel 
;                 65 bytes  - Mark Andreas 
 
; If no args, regs on startup are: 
 
; AX = BX = 0000h 
; SI = IP = 0100h 
; DI = SP = FFFEh 
 
IDEAL 
MODEL TINY 
P386 
CODESEG 
ORG 100h 
 
Start:  int     1ah             ; ah=00: cx=hours, dx=tic counter 
 
        mov     al,13h          ; Set mode 13h 
        int     10h 
 
        xchg    dx,ax 
 
        push    09000h          ; DS = last 64K segment 
        pop     ds 
        push    0A000h          ; ES = video memory 
        pop     es 
                                ; BX is already zero 
RandLoop: 
        rol     ax,1            ; Generate random number 
        adc     [bx],al 
        dec     bx 
        jnz     RandLoop 
 
; BX will not be equal to 3 the first time this loop is executed, but 
; it will be for all other times.   As SI = 0100h and DI = FFFEh on 
; startup, SI - DI will be equal to 258. 
 
LifeLoop: 
        xchg    cx,ax 
AccLoop: 
        add     cl,[di+bx-64]   ; Add in this column 
        add     cl,[si+bx-2] 
        add     cl,[si+bx+318] 
        dec     bx              ; Loop back 
        jnz     AccLoop 
 
        mov     al,[si]         ; Get center cell, set pixel 
        stosb 
        stc                     ; 3 = birth, 4 = stay (tricky): 
        rcr     al,cl           ; 1.00?0000x --> 0.0x100?00 (rcr 3) 
        and     al,20h          ; ^carry   |         ^ 
                                ;          +---> 0.00x100?0 (rcr 4) 
        or      [si-1],al       ; Add in new cell     ^ 
        shr     [byte di-65],5  ; Shift previous value 
 
        mov     bl,3            ; 3 iterations in AccLoop 
        inc     si              ; Loop while not zero 
        jnz     LifeLoop 
 
        mov     ah,1            ; Check for key 
        int     16h 
        jz      LifeLoop        ; Loop if no key 
 
        xchg    ax,bx           ; Set text mode 
        int     10h 
        ret                     ; Return 
End     Start

Remove key handler and RNG : 44 bytes

Start:  
 
        mov     al,93h          ; Set mode 13h 
        int     10h 
 
        push    09000h          ; DS = last 64K segment 
        pop     ds 
        push    0A000h          ; ES = video memory 
        pop     es 
                                ; BX is already zero  
LifeLoop: 
        xchg    cx,ax 
AccLoop: 
        add     cl,[di+bx-64]   ; Add in this column 
        add     cl,[si+bx-2] 
        add     cl,[si+bx+318] 
        dec     bx              ; Loop back 
        jnz     AccLoop 
 
        ;mov     al,[si]         ; Get center cell, set pixel 
		lodsb
        stosb 
        stc                     ; 3 = birth, 4 = stay (tricky): 
        rcr     al,cl           ; 1.00?0000x --> 0.0x100?00 (rcr 3) 
        and     al,20h          ; ^carry   |         ^ 
                                ;          +---> 0.00x100?0 (rcr 4) 
        or      [si-1],al       ; Add in new cell     ^ 
        shr     [byte di-65],5  ; Shift previous value 
 
        mov     bl,3            ; 3 iterations in AccLoop 
        ; inc     si              ; Loop while not zero 
        jmp short     LifeLoop

Switching to Textmode : 39 bytes