1225 PDP8 乘法器

先使用C語言寫乘法器程式碼如下:



執行結果：



將撰寫好的組合語言直接放置在記憶體內：

m[0] = 12'o7300;
m[1] = 12'o1037;
m[2] = 12'o2222;
m[3] = 12'o7200;
m[4] = 12'o1100;
m[5] = 12'o3100;
m[6] = 12'o2222;
m[7] = 12'o1101;
m[8] = 12'o3101;
m[9] = 12'o2222;
m[10] = 12'o1102;
m[11] = 12'o3102;
m[12] = 12'o1100;
m[13] = 12'o3036;
m[14] = 12'o3037;
m[15] = 12'o3040;
m[16] = 12'o7200;
m[17] = 12'o7100;
m[18] = 12'o1102;
m[19] = 12'o7040;
m[20] = 12'o7020;
m[21] = 12'o7001;
m[22] = 12'o1036;
m[23] = 12'o7430;
m[24] = 12'o7402;
m[25] = 12'o3036;
m[26] = 12'o1037;
m[27] = 12'o1101;
m[28] = 12'o3037;
m[29] = 12'o5020;
m[30] = 12'o0000;
m[31] = 12'o0000;
m[64] = 12'o0007;
m[65] = 12'o0003;
m[66] = 12'o0001;

執行結果:
Running...
0001/xxxx
TAD 0003/1037
0003/2222
CLA 0005/7200
DCA 0007/3100
0007/2222
TAD 0011/1101
0012/2222
0013/2222
DCA 0015/3102
DCA 0017/3036
DCA 0021/3040
CLL 0023/7100
CMA 0025/7040
IAC 0027/7001
SZL 0031/7430
DCA 0033/3036
TAD 0035/1101
JMP 0021/5020
CLL 0023/7100
CMA 0025/7040
IAC 0027/7001
SZL 0031/7430
DCA 0033/3036
TAD 0035/1101
JMP 0021/5020
CLL 0023/7100
CMA 0025/7040
IAC 0027/7001
SZL 0031/7430
DCA 0033/3036
TAD 0035/1101
JMP 0021/5020
CLL 0023/7100
CMA 0025/7040
IAC 0027/7001
SZL 0031/7430
DCA 0033/3036
TAD 0035/1101
JMP 0021/5020
CLL 0023/7100
CMA 0025/7040
IAC 0027/7001
SZL 0031/7430
DCA 0033/3036
TAD 0035/1101
JMP 0021/5020
CLL 0023/7100
CMA 0025/7040
IAC 0027/7001
SZL 0031/7430
DCA 0033/3036
TAD 0035/1101
JMP 0021/5020
CLL 0023/7100
CMA 0025/7040
IAC 0027/7001
SZL 0031/7430
DCA 0033/3036
TAD 0035/1101
JMP 0021/5020
CLL 0023/7100
CMA 0025/7040
IAC 0027/7001
SZL 0031/7430
OK x= 7 , y= 3 x*y= 21


執行結果波形圖: