Question

what is the role of the status lines S4 and S3 in the 8086?​

Answer 1

Status bits S3 and S4 indicate the segment register that is being used to generate the address the address and bit S5 reflects the contents of the IF flag. S6 is always held at 0 and indicates that an 8086 is controlling the system bus. Pins 1 and 20 are grounded. Pin 17 is NMI