- The lock output is used to lock peripherals off the system, ie, the other system bus masters will be prevented from gaining the system bus.
and - Queue status: The queue status bits shows the status of the internal instruction queue. The encoding of these signals is as follows
Function
0
0
No operation, queue is idle
0
1
First byte of opcode
1
0
Queue is empty
1
1
Subsequent byte of opcode
and - request/Grant: The request/grant pins are used by other local bus masters to force the processor to release the local bus at the end of the processors current bus cycle. These lines are bi-directional and are used to both request and grant a DMA operation. is having higher priority than .
- The lock output is used to lock peripherals off the system, ie, the other system bus masters will be prevented from gaining the system bus. 
and 
- Queue status: The queue status bits shows the status of the internal instruction queue. The encoding of these signals is as follows 
and 
- request/Grant: The request/grant pins are used by other local bus masters to force the processor to release the local bus at the end of the processors current bus cycle. These lines are bi-directional and are used to both request and grant a DMA operation.