Question

state the use of status signal in maximum mode

Answer 1

The pins 24 to 31 are maximum mode:

1. QS1, QS0 (output): These signals reflect the status of instruction queue. All the instructions of queue are mentioned in table.  

2. S2, S1, S0 (output): These represents type of transfer to be take place during the current bus cycle. These are used by 8288 bus controller to generate all memory and I/O operation access control signals.

3. LOCK: This signal is activated till the completion of instruction.

4. RQ/GT0 and RQ/GT1 (I/O): Request/Grant, each pin is bi-directional and can be left un-connected.