Pacman256 by Red Sector Inc. [web]
; ; /\______ /\______ /\________ ; __\\\___ \_ __\\\___ \_ __\\\______ \ ; | / / | / / | _____/ \_ ; | / /____| / /____| \ | ; | \____ : _____/ : \ | ; | / \ \ | ; | / . \ . \ | ; __ _|_ / \ \ _|_ __ ; \ \\_\ \\__\ _/ : \_ : \_ /__// /_// / ; |____/_ _ :______ _ :______ _ | ; \\\____________| \\\____________| \\\____________| ; ; _______ _______ _______ _______ _______ _______ ; _\\\__ \___\\\__ \___\\\__ \___\\\_____ \___\\\_____ \___\\\__ \_ ;| /______/| / /| / /| / | / | / / ;\ | / /_| / /_| / | / | / /_ ;|\_______ : _____/ : \_____/ : / : / : \____ | ;| / . \ . \ . / . / . / | ;| / \ \ / / | ;|___ :___ :___ :___\ :___ :___/ sns | ; \\_________: \\_________: \\_________: \\_________: \\_________: \\_________| ; ; R E D S E C T O R I N C ; g equ p+6 ; Pacman256 by Baudsurfer/rsi 2015 aka olivier.poudade.free.fr w equ word ; A 256 bytes intro tested for XPSP3 and VMWare (set x=1) only b equ byte ; Presented at QB Multi-platform Party 2015 in Sülysáp/Hungary x equ 0 ; greet Blabla Bon^2 DESiRE Live! MNDRN Onslaught RZR1911 TRBL org 100h ; UkkO Ggn Fra Den g0blinish Sensenstahl & all assembly coders mov al,13h ; psp+256, if pb or VMWare then set x equ 1 set video fx int 10h ; bios video api mov bp,450h ; DECOMPRESS AND DISPLAY MAZE cwd ; dx=0 mov cl,16h ; board 22 non-symetric rows a:mov ch,11h ; board 16 cols+ 1 overlay (col17=col1) u:inc dx ; col++ inc byte [fs:450h] mov al,0dbh ; al=dbh=219=wall rol w[m+si-100h],1 ; get next col bitmask in maze map array jc c ; if not wall then obligatory dot mov al,0f9h ; al=f9h=249=dot c:mov w[fs:bp],dx ; empty - update curs row/col pos int 29h ; putchar short dos call dec ch ; *this row's col total-- jnz u ; all cols of *this row processed ? lodsw ; maze idx+=siz(w) mov dl,ch ; crlf=xor dl,dl inc dh ; row++ add dh,cl;inc dh;inc byte [fs:451h] loop a ; INIT/DIPLAY PACMAN AND GHOSTS struct siz=6 mov edx,10100202h ; disp extra col off. enable row|col dx symetry mov di,g ; ghost status base idx mov cl,4 ; 4 ghost structs to init e:mov al,1eh ; al=glyph ascii val ah=putback tile glyph stosw ; store ghost glyph+color ror edx,8 ; (col=16 row=2)/(col=2 row=16) symetry int 29h ; display char /w dx=curs pos mov al,48h ; default starting direction for ghost is up stosw ; ghost direction (false kbd scancode) - w padded mov ax,dx ; dw ghost position stosw ; save ghost row/col pos di+=2 loop e ; all ghost structs init done ? f:mov di,p ; run - GAME LOOP rst to glyph struct base h:in al,60h ; delay - messy but shortest working code test al,al ; is it make scancode ? js i ; else skip break scancode mov b [di+2],al ; glyph direction i:loop h ; break - cx=65535 rollover from below loop mov cl,5 ; pacman+4 ghosts start /w pacman (should be cx) j:mov dx,w[di+4] ; switch - store rollback position mov w[fs:bp],dx ; glyph col+row positions mov si,k ; dir mov array for keys mov bl,4 ; test 4 arrow keyb keys t:lodsb ; direction - out: car ah=scancode al=ascii cmp al,b[di+2] ; scancode=arrow ? lodsw ; NULL last mov deltaX deltaY assumed in seg jz l ; found asked deltas=>check collision dec bl ; test all 4 NSWE directions jnz t ; test next direction l:add w[fs:bp],ax ; collision - assumed NULL w at key+12 mov ah,8 ; ah=read car and attrib @curs pos vga api IF x ; BEG for some non-fully compatible bios clones push si ; "Because of the IBM BIOS specifications may exist push di ; some clone BIOSes which do not preserve SI or DI" push bp ; "Some IBM PC ROM BIOSes destroy BP when in gfx modes" push bx ; should not be necessary in gfx mode as all mov bh,0 ; other family calls have implict bh=dontcare END IF ; END for some non-fully compatible bios clones int 10h ; out: ah=car color al=car val bh=page number n/A IF x ; BEG for some non-fully compatible bios clones pop bx ; see Ralf Brown's interrupt list warnings pop bp ; cf. http://www.ctyme.com/intr/rb-0098.htm pop di ; cf. http://www.ctyme.com/intr/rb-0098.htm pop si ; cf. http://www.ctyme.com/intr/rb-0098.htm END IF ; END for some non-fully compatible bios clones test al,10b ; if !(wall 11011011b or ghost 11110b) discrimination jz o ; then move is legal and carry on xchg w[fs:bp],dx ; rollback - is wall =>rollback move cmp cl,5 ; test if pacman or ghosts jz n ; if pacman keep prev dir and skip frame inc b[di+2] ; else try all 4 directions jmp j ; switch break happens above so loop n:mov al,b[di+3] ; put rollback mov b[di+2],al ; in active position inc bh ; see alt direction below in "key" (k) jnp j ; cf. alt key below - tricky wrap-around jmp s ; and skip event since move faulty o:mov bl,b[di+2] ; event - preserve al=glyph putback tile mov b[di+3],bl ; and keep prev move dir cmp al,9 ; case new tile=pacman ? jnz q ; if not continue ret ; death - else die and exit game to shell q:mov b[di+1],al ; live - save putback tile cmp cl,5 ; test if pacman glyph jnz r ; if not skip hardcoded replacement char mov al,20h ; space char replaces * exclusively for pacman r:xchg w[fs:bp],dx ; samescore - score display was stripped int 29h ; glyph putback tile=al=[di+1] xchg w[fs:bp],dx ; switch actual /w requested curs pos mov w dx,[fs:bp] ; and restore it in dx mov w[di+4],dx ; save previous curs pos mov al,[di+0] ; glyph char int 29h ; display glyph new position s:add di,6 ; nokey - advance to next glyph struct loop j ; next glyph movement jmp f ; next game loop frame m dw 0ffffh ; 11111111111111111b maze data dw 8080h ; 10000000100000001b little endian 17x22 playfield map dw 0b6b6h ; 10110110101101101b shadow 17th column=1st column dw 0b6b6h ; 10110110101101101b total=44 bytes dw 8000h ; 10000000000000001b dw 0b5d6h ; 10110101110101101b dw 8490h ; 10000100100100001b dw 0f6b7h ; 11110110101101111b dw 0f417h ; 11110100000101111b dw 0f557h ; 11110101010101111b dw 8140h ; 00000001010000000b dw 0f5d7h ; 11110101110101111b dw 0f417h ; 11110100000101111b dw 0f5d7h ; 11110101110101111b dw 8080h ; 10000000100000001b dw 0b6b6h ; 10110110101101101b dw 9004h ; 10010000000001001b dw 0d5d5h ; 11010101110101011b dw 8490h ; 10010000100001001b dw 0bebeh ; 10111110101111101b dw 8000h ; 10000000000000001b dw 0ffffh ; 11111111111111111b k db 48h,0,-1 ; up (alt=left) arrow - make scanc lsb,deltaX,deltaY db 50h,0,1 ; down (alt=up) arrow - cursor update compensated db 4bh,-1,-1 ; left (alt=right) arrow+ compensate sign extend db 4dh,1,0 ; right (alt=down) arrow assumed null b p dw 3209h,4dh,1008h ; glyp+putback/direction+rollback/col+row
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