Keyboard input from ABC as a 3 bit binary number corresponding to the input 101
In addition, there are three inputs G1, G2A, G2B also respectively from the keyboard input
Need to satisfy the G1 is 1 G2A, G2B output for 8 + 0 conditions in the three binary BCD code corresponding to the number in the 8 + output is - such as the current subject input is 101 then display should be + + + + + + +
Square can use other symbols instead of
If you don't satisfy the G1 and G2A, G2B request output for 8 +