过去的汇编代码

1.阶乘

SSEG SEGMENT STACK
   STK DB 20 DUP(0)
SSEG ENDS

CSEG SEGMENT
  ASSUME SS:SSEG
  ASSUME CS:CSEG
;入口参数ax,
;出口参数ax
F PROC
  AND AX,AX
  JNZ  GO
   MOV AX,1
   RET
  GO:PUSH AX
   DEC AX
   CALL F
   POP BX
   MUL BX
   RET
F ENDP
;输入函数;
;出口al
INPUT PROC
  MOV AH,01
  INT 21H
  RET
INPUT ENDP
CHAR PROC 
  MOV CL,12
  SHR BX,CL
  MOV DL,BL
  CMP DL,9
  JBE  NO_ADD
  SUB  DL,10
  ADD  DL,'A'
  SUB DL,'0'
 NO_ADD: ADD DL,'0'
  MOV AH,02H
  INT 21H
  RET
CHAR ENDP
;显示ax
SHOW PROC 
   MOV BX,AX
   PUSH BX
   CALL CHAR
   POP BX
   PUSH BX
   MOV CL,4
   SHL BX,CL
   CALL CHAR
   POP BX
   PUSH BX
   MOV CL,8
   SHL BX,CL
   CALL CHAR
   POP BX
   MOV CL,12
   SHL BX,CL
   CALL CHAR
   RET
SHOW ENDP 
  
MAIN:MOV AX,SSEG
    MOV SS,AX
    MOV SP,SIZE STK
   
   CALL INPUT
   SUB AL,'0'
   MOV AH,0
   CALL F
   PUSH AX
   MOV DL,10
   MOV AH,02
   INT 21H
   POP AX
   CALL SHOW
  MOV AH,4CH
  INT 21H
CSEG ENDS
  END MAIN

2.21H的02功能会影响AL

CSEG SEGMENT
ASSUME CS:CSEG
MAIN:
 MOV AX,3132H
 MOV DL,AH
 MOV AH,2
 INT 21H
 MOV DL,AL
 INT 21H
 MOV AX,4C00H
 INT 21H
CSEG ENDS
 END MAIN

3.多字节乘法思路：先用高级语言来描述思路，再用低级语言去实现

#include
using namespace std;
int main(){
	int a[3] = { 1, 2, 3 }, b[3] = { 4, 5, 6 }, c[7] = {0};
	int i, j,k;
	for (i = 0; i < 3; i++)
		for (j = 0; j < 3; j++){
		c[i + j] += a[i] * b[j];
		for (k = i + j; c[k] > 10; k++){
			c[k + 1] += c[k] / 10;
			c[k] %= 10;
		}
		}
	for (i = 7; i >0; i--)
		cout << c[i] << " ";
	cout << endl;
	return 0;
}

4.打印九九乘法表

SSEG SEGMENT STACK
    STK  DB 20 DUP(0)
SSEG ENDS
CSEG SEGMENT
       ASSUME  CS:CSEG
       ASSUME SS:SSEG
CHAR PROC
    PUSH AX
    MOV AH,02H
    INT 21H
     POP AX
    RET
CHAR  ENDP
DISPLAY PROC
     ADD DL,'0'
     CALL CHAR
     RET
DISPLAY ENDP
SHOW  PROC
      PUSH AX
      MOV DL,10
      DIV   DL
      AND AL,AL
      JZ    ONE
      MOV DL,AL
      CALL DISPLAY
ONE:  MOV DL,AH
      CALL DISPLAY
      POP AX
     RET
SHOW ENDP
MAIN:MOV  AX,SSEG
      MOV SS,AX
     MOV SP,SIZE  STK
     MOV AH,1
OUTER:CMP AH,9
       JA   OVER
              MOV AL,1
INNER :CMP AL,AH
             JA  INIT
            MOV DL,AH
             CALL DISPLAY
             MOV DL,'*'
             CALL CHAR
             MOV  DL,AL
             CALL DISPLAY
             MOV  DL,'='
             CALL CHAR
              PUSH AX
              MUL AH
              CALL SHOW 
              POP AX
             INC AL
             MOV DL ,' '
             CALL CHAR
             JMP INNER
INIT:MOV  DL,10
       CALL CHAR
         INC AH
         JMP OUTER
OVER:MOV AX,4C00H
       INT 21H
CSEG ENDS
    END MAIN

5.画棋盘

SSEG SEGMENT STACK
 STK DB 20 DUP(0)
SSEG ENDS
CSEG SEGMENT
  ASSUME CS:CSEG
  ASSUME SS:SSEG
POINT PROC
  PUSH AX
  MOV AX,0C12H
  INT 10H
  POP AX
  RET
POINT ENDP
LINE_H PROC
  PUSH CX
  MOV CX,9
AGAIN_0:INC CX 
  CMP CX,190
  JA OUT_0
  CALL  POINT
  JMP AGAIN_0
OUT_0:  POP CX 
  RET  
LINE_H ENDP
LINE_V PROC
  PUSH DX
  MOV DX,9
AGAIN_1:INC DX
   CMP DX,190
   JA OUT_1
   CALL POINT
   JMP AGAIN_1
OUT_1:POP DX
  RET
LINE_V ENDP
MAIN:MOV AX,SSEG
    MOV SS,AX
     MOV AH,0
    MOV AL,04H
    INT 10H
    MOV BH,0
    MOV CX,100
    MOV DX,100
AGAIN_100:INT 10H
    LOOP AGAIN_100    
    CALL POINT
    MOV DX,0
AGAIN_2:ADD DX,10
    CMP DX,190
    JA  OUT_2
    CALL LINE_H
    JMP AGAIN_2
OUT_2:MOV CX,0
AGAIN_3:ADD CX,10
   CMP CX,190
    JA OUT_3
    CALL LINE_V
    JMP AGAIN_3
OUT_3:MOV AH,01
    INT 21H
    MOV AH,4CH
   INT 21H
CSEG ENDS
    END MAIN

6.文件复制

                       DSEG SEGMENT
  F1 DB 20,20 DUP(0)
  F2 DB 20,20 DUP(0)
  N1 DW 0
  N2 DW 0
  B  DB 100 DUP(0)
DSEG ENDS
CSEG SEGMENT
  ASSUME DS:DSEG
  ASSUME CS:CSEG
IN_NAME PROC
  PUSH AX
  PUSH BX
  MOV AH,0AH
  INT 21H
  MOV BX,DX
  INC BX
  MOV SI,BX
  INC SI
  MOV AL,[BX]
  MOV AH,0
  ADD SI,AX
  MOV AL,0
  MOV [SI],AL
  POP BX
  POP AX
  RET
IN_NAME ENDP
OPEN PROC
  MOV AX,3D02H
  INT 21H
  MOV [SI],AX
  RET
OPEN ENDP
MAIN:MOV AX,DSEG
  MOV          DS,AX
  LEA DX,F1
  CALL IN_NAME   
  MOV AH,02H
  MOV DL,10
  INT 21H
  MOV DL,13
  INT 21H
  LEA DX,F2
  CALL IN_NAME
  LEA DX,F1
  ADD DX,2
  LEA SI,N1
  CALL OPEN
  LEA DX,F2
  ADD DX,2
  LEA SI,N2
  CALL OPEN
  MOV BX,N1
  LEA DX,B
  MOV AH,3FH
  MOV CX,1
AGAIN:  PUSH AX
  PUSH BX
  PUSH CX
  PUSH DX
  INT 21H
  MOV AL,B
  CMP AL,'#'
  JZ OVER
  MOV AH,40H
  MOV CX,1
  LEA DX,B
  MOV BX,N2
  INT 21H
  POP DX
  POP CX
  POP BX
  POP AX
  JMP AGAIN
 OVER:MOV BX,N1
  MOV AH,3EH
  INT 21H
  MOV BX,N2
  INT 21H 
  MOV AX,4C00H
 INT 21H
CSEG ENDS
  END MAIN

7.向有序表中插入一个数据

DSEG SEGMENT 
 A DB 1,2,3,5,6,7,0
 ASIZE DB 6
 N DB 4
DSEG ENDS
SSEG SEGMENT STACK
 STK DB 20 DUP(0)
SSEG ENDS
CSEG SEGMENT
ASSUME SS:SSEG
ASSUME CS:CSEG
ASSUME DS:DSEG
ASSUME ES:DSEG
MAIN:MOV AX,DSEG
 MOV DS,AX
 MOV ES,AX
 MOV SP ,SIZE STK
 MOV AX,SSEG
 MOV SS,AX
 
 LEA SI,A
 LEA BX,A
 ADD BL,ASIZE
 DEC BX
AGAIN0:CMP SI,BX
 JA OVER0
 MOV AL,[SI]
 CMP N,AL
 JA GO
 JMP OVER0
GO:INC SI
 JMP AGAIN0
OVER0:MOV AL,ASIZE
 INC AL
 MOV ASIZE,AL
AGAIN1:
 CMP BX,SI
 JL OVER1
 MOV AL,[BX]
 MOV [BX+1],AL
 DEC BX
 JMP AGAIN1
OVER1:
 MOV AL,N
 MOV [SI],AL
 MOV AX,4C00H
 INT 21H
CSEG ENDS
 END MAIN

回顾大一大二，走了不少弯路。当年我一心学习GUI，想编出可视化程序，可是我依旧在dos黑框框下玩了一年半。
学习MFC，API耽误了许多时间。老师们也不提示一下该学什么，我也不知道用好网络资源。
有很多想编但是没编成的程序，如今看来只觉当年图样图西木破。
但是，我一直在探索，在进步，对许多方面有所涉猎，虽然忘记许多，却依旧有一种淡淡的知道感。
大学光阴就这么悄悄地溜走了。
该删的就删了吧，该忘的就忘了吧，时光如同大河，浩浩荡荡，每一步有每一步的风景，不必留恋过去。
现在有的将来还会有。