The following table shows part of the instruction set for a processor. The processor has two registers: the Accumulator (ACC) and an Index Register (IX). Instruction Opcode Operand Explanation LDM #n Immediate addressing. Load the number n to ACC LDD <address> Direct addressing. Load the contents of the location at the given address to ACC LDI <address> Indirect addressing. The address to be used is at the given address. Load the contents of this second address to ACC LDX <address> Indexed addressing. Form the address from <address> + the contents of the index register. Copy the contents of this calculated address to ACC LDR #n Immediate addressing. Load the number n to IX ADD #n/Bn/&n Add the number n to the ACC ADD <address> Add the contents of the given address to the ACC SUB #n/Bn/&n Subtract the number n from the ACC SUB <address> Subtract the contents of the given address from the ACC INC <register> Add 1 to the contents of the register (ACC or IX) <address> can be an absolute or a symbolic address # denotes a denary number, e.g. #123 B denotes a binary number, e.g. B01001010 & denotes a hexadecimal number, e.g. &4A

1. (a)The current contents of memory are shown: Address Data 10 1 11 3 12 5 13 11 14 10 15 16 16 12 The current contents of the ACC and IX are shown: ACC 10 IX 0 Complete the table by writing the content of the ACC after each program has run. Program number Code ACC content 1 LDI 15 SUB #1 2 LDD 14 ADD 11 3 LDM #11 ADD #3 SUB 16 4 LDR #2 LDX 14 ADD #2[4]
2. (b)The processor includes these bit manipulation instructions: Opcode Operand Explanation AND #n/Bn/&n Bitwise AND operation of the contents of ACC with the operand AND <address> Bitwise AND operation of the contents of ACC with the contents of <address> XOR #n/Bn/&n Bitwise XOR operation of the contents of ACC with the operand XOR <address> Bitwise XOR operation of the contents of ACC with the contents of <address> OR #n/Bn/&n Bitwise OR operation of the contents of ACC with the operand OR <address> Bitwise OR operation of the contents of ACC with the contents of <address> <address> can be an absolute or a symbolic address # denotes a denary number, e.g. #123 B denotes a binary number, e.g. B01001010 & denotes a hexadecimal number, e.g. &4A The current contents of memory are shown: Address Data 25 11000110 26 11100001 27 10000001 28 11001101 29 00001111 The current content of the ACC is shown: 0 1 0 0 0 1 1 0 Complete the table by writing the content of the ACC after each program has run. The binary number 01000110 is reloaded into the ACC before each program is run. Program number Code ACC content 1 XOR 29 2 AND #29 3 OR B11111111[3]