如何将值从输入 AL 移至寻址寄存器（如 BX ....它是 16 位）

Question

我陷入了这段代码......我想从用户那里获取输入并将其移动到寄存器中......但是寄存器是16位的并且输入存储在Al中，这是8位的......有没有办法将值从 AL 移动到像 BX 这样的寄存器...我这样做是因为我想在数组中使用 BX，例如 array[bx]....请帮我解决这个问题..

.MODEL SMALL
.STACK 100H
.DATA
MSG DB 10,13,"TIC TAC TOE $"
MSG1 DB "   $"
ARR1 DB '1','2','3','4','5','6','7','8','9'
MSG2 DB 10,13,"PLAYER 1 WIN $"
MSG3 DB 10,13,"PLAYER 2 WIN $"
MSG4 DB 10,13,"GAME DRAW $"
VAR DW ?
PLAYER1 EQU 'X'
PLAYER2 EQU 'O'
.CODE
MAIN PROC
    MOV AX , @DATA
    MOV DS , AX


NEXT_LINE1: 
    MOV BX , 0             ;counter
NEXT_LINE:                     ;this loop will shape the array in matrix form 
    MOV AH , 2
    MOV DL , 0AH           ; move on next line
    INT 21H
    MOV DL , 0DH
    INT 21H
    MOV CX , 3
L1:
    MOV AH , 2            ;display content of array
    MOV DL , ARR1[BX]
    INT 21H
    MOV AH , 9
    LEA DX , MSG1      ;msg to show space between characters.. like 1  2  3 ,,,, 4  5  6
    INT 21H
    INC BX
    CMP BX , 10
    JE ELSE_IF
    LOOP L1
    JMP NEXT_LINE

ELSE_IF:
    MOV BX , 0

                       ;take input from user
    MOV AH , 1
    INT 21H
    SUB AL , 1
    ADD BX , AL        ;try to save it into register like bx , si , di ...
    MOV DX , 'X'
    MOV  ARR1[BX] , DL
    JMP NEXT_LINE1  

    MOV AH , 4CH
    INT 21H
MAIN ENDP
    END MAIN

Answer 1

几个选项：

movzx bx, al     ; move with zero-extend

movsx bx, al     ; move with sign extend

xor bx, bx       ; clear bx 
mov bl, al