4 o Program Counter (PC): 8-bit register which stores the address of the
5 next instruction to be fetched from memory.
7 o Instruction Register (IR): 16-bit register which stores the instruction
10 o Proc. Status Word (PSW): 8-bit register which stores information
11 regarding the last executed operation. The current flags are EQ (equals)
12 LE (lesser), GR (greater).
14 o General purpose registers (R): four (from R1 to R4) registers of 8-bit
17 o Main memory: 256 cells of 8-bit each, the processor can access individual