Hardware Questions

Use the concept of register-retiming.

divide the totla combinatorial delay in two segments such that individually the delay is less the clock period.

this can be done by inserting a flip-flop in the combinational path.

e.g.,

clock period --- 5 ns

total cominational delay ---- 7

then divide the 7ns path in two path of 4 or 3 (best resutls are obtained if delays are  same for both path i.e 3.5ns) by inserting a flip-flop in between.

Accumulator register, Temporary register, Instruction register, Stack Pointer, Program Counter are the various registers in 8085

TRAP, RST7.5, RST6.5, RST5.5, INTR.

Pass input to XOR and give their outputs to OR gate, if your output is 0 both 8-bit signals are same.

OR

Pass input to XNOR and give their outputs to AND gate, if your output is 1 both 8-bit signals are same. 

Bus Interface Unit and Execution unit, are the two different functional units in 8086.

1.Limitations on the size of data. 

2.Most Microprocessors does not support floating-point operations. 

3.Over heating physically

4. Not bit addressable

The data bus is Bi-directional because the same bus is used for transfer of data between Micro Processor and momory of input / output devices in both the direction.

The basic expansion card types in A+ Hardware certification are ISA and PCI, ISA these can be used only on XT, AT and ATX boards. The industry now considers ISA obsolate.