A hypothetical machine is given as follows. The partial list of opcodes (bits 0-3) for the machine are as follows. 0001 = Load AC from Memory 0010 = Store AC to Memory 0011 = Add to AC from Memory 0100 = Load AC from I/O 0101 = Store AC to I/O 0110 = Load Register from Memory 0111 = Store Register to Memory 1000 = Add to AC from Register The list of registers (bits 4-5) for the machine are as follows. 00 Register 1 01 Register 2 10 Register 3 11 Register 4 In the following cases, the remaining 10 bits identify a particular I/O device or memory location. Show the program execution (contents of IR, PC, AC) for the following program where the following instructions are executed from memory locations 300, 301, 302, 303, and 304 respectively. 1.Load Register 1 from Device 5. Assume that the next value retrieved from device 5 is 30 2.Add content of Register 2. (Assume that Register 2 contains a value of 20.) 3.Store AC to device 6.
A hypothetical machine is given as follows.
The partial list of opcodes (bits 0-3) for the machine are as follows.
0001 = Load AC from Memory
0010 = Store AC to Memory
0011 = Add to AC from Memory
0100 = Load AC from I/O
0101 = Store AC to I/O
0110 = Load Register from Memory
0111 = Store Register to Memory
1000 = Add to AC from Register
The list of registers (bits 4-5) for the machine are as follows.
00 Register 1
01 Register 2
10 Register 3
11 Register 4
In the following cases, the remaining 10 bits identify a particular I/O device or memory location. Show the
1.Load Register 1 from Device 5. Assume that the next value retrieved from device 5 is 30
2.Add content of Register 2. (Assume that Register 2 contains a value of 20.)
3.Store AC to device 6.
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