... char ch; int ch1=0,*p1,*p2,co_bang2=0; int bang_chu2[] = { 0x03,0x19,0x0E,0x09,0x01, 0x0D,0x1A,0x14,0x06,0x0B, 0x0F,0x 12, 0x1C,0x0C,0x18, II. Chöông trình: #include<dos.h> ... if(co_bang2==0){outportb((int)&COM->data,0x1B);de_lay(10);co_bang2=1;} printf("%c",ch); ch1 = (int)ch - 33; outportb((int)&COM -> data, p2[ch1]);de_lay (2) ; } ... (int)ch<= 122 ) ch =toupper(ch); if((int) ch>=65 && (int)ch<=90) { printf("%c",ch); if(co_bang2==1){outportb((int)&COM -> data,0x1F);de_lay(10);co_bang2=0;}...