Key Handlers in assembly

im working on a project in witch the program has to do a few lines of code when specific keys are down (pressed) i have tried using Ah 1 int 21 and AH 1 int 16 and direct connect to keyboard with in al , 60h but all of these seem to have one big problem . if the user press more than one key at a time the program fails to detect that . what i really need is reading the input buffer in a loop and executing code for specific keys .

This Code Sample runs at my main loop every frame:

;in al,60h  
;mov cl,al  
;in al,61h 
;mov ah,al   #Tried this didn't work...
;or al,80h 
;out 61h,al 
;mov al,ah   
;out 61h,al 
;mov al,cl 


 xor bx, bx

_poll_key:



 mov ah, 01h
 int 16h
jz _poll_key


 xor ah, ah
 int 16h

 mov bl, al
 call dispatch_key
jmp _poll_key

dispatch_key: 
mov al , ah
;________________________________________

        cmp al , 11h ; W HexScanCode
        jne NotW
        sub rbx , 160
        mov ah , red 
        mov bx , rbx
        mov es:[bx] , ah

        NotW:
        cmp al , 1Fh; S HexScanCode
        jne NotS
        add rbx , 160
        mov ah , red 
        mov bx , rbx
        mov es:[bx] , ah

        NotS :
        cmp al , 20h; D HexScanCode
        jne NotD
        add rbx , 2
        mov ah , red 
        mov bx , rbx 
        mov es:[bx] , ah
        NotD:
        cmp al , 1Eh ; A HexScanCode
        jne NotA
        sub rbx , 2
        mov ah , red 
        mov bx , rbx
        mov es:[bx] , ah

        NotA:
        ;Second Player___________________________________________________________________

        cmp al , 17h ; I HexScanCode 
        jne NotI
        sub bbx , 160
        mov ah , blue 
        mov bx , bbx 
        mov es:[bx] , ah

        NotI:
        cmp al , 25h ; K HexScanCode
        jne NotK
        add bbx , 160
        mov ah , blue 
        mov bx , bbx
        mov es:[bx] , ah

        NotK:
        cmp al , 26h ; L HexScanCode  
        jne Notl
        add bbx , 2
        mov ah , blue
        mov bx , bbx
        mov es:[bx] , ah
        Notl:
        cmp al , 24h; J HexScanCode
        jne Notj
        sub bbx , 2
        mov ah , blue
        mov bx , bbx
        mov es:[bx] , ah

        Notj:
        cmp al , 10h ; Q HexScanCode
        je finish

        ;;;;;;;;;;;;;;;;;;;
        ;First Player 
        mov ah , blue
        mov bx , bbx
        ;UP
        sub bx , 160
        mov es:[bx] , ah
        add bx , 160
        ;Down
        add bx , 160
        mov es:[bx] , ah 
        sub bx , 160
        ;Right
        add bx , 2 
        mov es:[bx] , ah
        sub bx , 2
       ;Left
        sub bx , 2 
        mov es:[bx] , ah
        add bx , 2
        ;Second Player
        mov ah , red
        mov bx , rbx
        ;Up
        sub bx , 160
        mov es:[bx] , ah
        add bx , 160
        ;Down
        add bx , 160
        mov es:[bx] , ah
        sub bx , 160
        ;Right
        add bx , 2 
        mov es:[bx] , ah
        sub bx , 2
        ;Left

        sub bx , 2 
        mov es:[bx] , ah
        add bx , 2

        ;

this code can only handel one key at a time... Witch is not what im looking for

here's some blueprints of how an optimal solution would look:

loop:

LoopUntilInputBufferEmpty:
;{get  ACII / ScanCode From Input Buffer}
cmp al , {...}
jne KeyHandel1
;Code
KeyHandel1
cmp al , {...}
jne KeyHandel2
;Code
KeyHandel2
cmp al , {...}
jne KeyHandel3
;Code
KeyHandel3:
cmp {bufferEmpty?} , {Yes}
jne LoopUntilBufferEmpty

;
;{All Main Loop Code}
jmp loop

SHORT: Handeling a few key pressed at the same time

---

Any one know of a way to achive that ?

-Thanks Ahead

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