These are the different types of pins that will be found on a CPU. Be sure you understand what all the pins on the chips can do. It is not necessary to memorize the mnemonics, like BHE, but if I were to ask, "What does the Byte High Enable pin on the 80286 do?", you should be able to tell me its function.
Sometimes an address line and a data line are multiplexed into 1 line. Logically they are separate, but physically they share the same pins on the chip. There may be pins to indicate the size of the data to write: 8, 16 or 32 bits.
There can be different levels of interrupts. The Intel chip has two levels of interrupts, the Motorola chip has eight.
Intel chip has Hold (Bus Request) and Hold Acknowledge (Bus Grant). Motorola has Bus Request, Bus Grant, and Bus Acknowledge. There may be separate pins for a coprocessor.
Pins to indicate if it is a memory or I/O access. It is also possible to distinguish between code and data. There may be a pin to indicate if the device has completed the operation. Also, there could be a pin that the CPU can assert to indicate that it will not release the bus since it is in the middle of an important operation. There may be pins to allow backward compatibility to older hardware. It is possible to add pins to initiate the next bus cycle before the current one has finished completely. Pins to indicate when data and address lines are stable can also be present.
Pins to allow the CPU to communicate with a cache chip.
Pins for indicating the current status of the CPU.
The RESET pin is an example of a miscellaneuos pin.