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ASSUME CS:CODE,DS:DATA
CODE SEGMENT
MOV AX,DATA
MOV AL,00H
MOV CL,ARRAYSIZE
MOV DL,KEY
MOV SI,OFFSET ARRAY
ITER: ;ITERATION CODE BLOCK
    CMP DL,[SI]
    JE FOUND ; IF EQUAL TO KEY EXIT LOOP
    INC SI
LOOP ITER
MOV AX,0000H
JMP EXITOUT
FOUND:
    MOV AX,1111H
    JMP EXITOUT ;EXIT CODE
EXITOUT:
    HLT
CODE ENDS
DATA SEGMENT
ARRAY DB 01H,05H,11H,25H,10H ; DEFINE YOUR ARRAY
ARRAYSIZE DB 05H ;DEFINE ARRAY SIZE
KEY DB 25H ; DEFINE THE LETTER TO BE FOUND
DATA ENDS
END