microprocessor diagram

i have to answer an exam type question relating to components in a microprocessor.
i've been given a diagram with 5 components, 3 of which i can identify as registers (i think) and i can identify the address and data buses.
How do i identify the ROM chip and how do i determine its capacity in Kb?
Component1 has RD & WR connected to the 3 registers (control bus?? i think?)
Components 3,4 & 5 are the registers.
3)address bus A0-A10, data bus D0-D7
4) " " A0-A13, " " D0-D7
5) " " A0,A1,A2 " " D0-d7
These registers are displaying CS where
Component 2 is connected to each register at this point (CS) and also connected (address bus) points A14, A15 to component 1.

Does ne 1, can ne 1 understand????????
Help !!