The partial list of opcodes for the machine are as follows.

1001 = Load AC from Memory

1010 = Store AC to Memory

1011 = Add to AC from Memory

1100 = Load AC from I/O

1111 = Store AC to I/O

A. Load AC from device 7 (Hint: represent the address part of the Instruction Format for I/O as Hexadecimal equivalent of 5). Assume that the next value retrieved from device 7 is 7

B. Add content of memory location 940. (Assume that: Location 940 contains a value of 4.)

C. Store AC to device 6

3 4 15 Opcode Address (a) Instruction format 15 Magnitude (b) Integer format Program Counter (PC) Address of instruction Instruction Register (IR) Instruction being executed Accumulator (AC) Temporary storage (c) Internal CPU registers 3 4 15 Opcode Address (a) Instruction format 15 Magnitude (b) Integer format Program Counter (PC) Address of instruction Instruction Register (IR) Instruction being executed Accumulator (AC) Temporary storage (c) Internal CPU registers