汇编常驻内存实时时钟

DATAS SEGMENT
    SPACE DB 1000 DUP (' ')
    STR  DB 0DH,0AH, 'now the time is: $'
DATAS ENDS

STACKS SEGMENT
    DW 200 DUP(?)
STACKS ENDS

CODES SEGMENT
    ASSUME CS:CODES,DS:DATAS,SS:STACKS
START:
    MOV AX,0001H          ;设置显示方式为40*25彩色文本方式            
    INT 10H
    MOV AX,DATAS
    MOV DS,AX
    lea dx,STR
    mov ah,9
    int 21h
    
agains:
    mov ah,2ch
    int 21h
    mov al,ch
    cbw
    call print
    mov dl,':'
    mov ah,2
    int 21h
    mov al,cl