When IBM has released IBM PC (XT) launched as the first , which the CPU 8088 is a CPU with 8 bit. Therefore use computer this is the data path only 8 routes and address route 20 route for use in the position citing the memory. Card to bring come per with PC Bus is a Card Type 62 pin, which is 8 pin used for data transmission, another 20 pin for claiming the position of memory