Question

我正在研究我的第一个程序，它执行一些计算并将结果存储在AL寄存器中。我有一个问题，我从HEX转换为ASCII子程序，将其打印到屏幕。因此，如果AL中的值介于0和9之间，则打印ASCII值没有问题。问题是如果AL中的值大于9，我打印了3个零。请，任何评论可能会有所帮助。这是我的代码：

FNUM    DB  20 Dup ?

B2A8:
     LEA    DI, FNUM        ;point DI to ASCII save
     MOV    W[DI], 3030H    ;preload ASCII buffer with number bias
     MOV    B[DI+2], 30H
B2A1:
     SUB    AL, 100     ;subtract 100's placeholder value
     JC     B2A2        ;if negative, we subtracted too much
     INC    B[DI]       ;if positive, add 1 to ASCII byte
     JMP    B2A1        ;continue counting place values until minus
B2A2:
     ADD    AL, 100     ;restore AL to previous value over subtracted
B2A3:
     SUB    AL, 10      ;subtract 10's placeholder value
     JC     B2A4        ;if negative, we subtracted too much
     INC    B[DI+1]     ;if positive, add 1 to ASCII byte
     JMP    B2A3        ;continue counting place values until minus

B2A4:

     ADD    AX, 10      ;restore AL to previous value over subtracted
     ADD    [DI+2], AL  ;create units character
     MOV    B[DI+3], '$'    ;mark end of the text
     RET

用汇编语言从十六进制转换为ASCII

0 个答案: