info.txt

it containes 16 bits (or 2 bytes) address space.
first 4 bits [15:12] specify the opcode(operation to be performed), remaining bits [11:0] provide further information. 
eight 16-bit registers, numbered from 000 to 111 to hold values/result
three 1-bit registers for condition codes:
                    N (negative)
                    Z (zero)
                    P (positive)
processor status register (PSR): 16-bit register, containing status information about the currently executing process:
    PSR[10:8] defines priority level (from PL7 to PL0, where PL7 is highest)
    PSR[15] defines privilege mode e.i. supervisor mode (privileged and PSR[15] = 0) and user mode (unprivileged and PSR[15] = 1)
    PSR[2:0] contains the condition codes
    PSR[2] is N, PSR[1] is Z, PSR[0] is P
    PSR[14:3] are reserved (unused)