Final answer:
The value of the program counter after executing the instruction B0CD depends on the specifics of the machine's architecture and instruction set, and whether B0CD is a control flow instruction or not. Generally, the program counter is updated to point to the next instruction to execute.
Step-by-step explanation:
The question asks about the value of the program counter after executing a particular instruction (B0CD) in a machine described in Appendix C. Without specific details about the architecture or instruction set from Appendix C, a generic answer cannot be provided.
However, in most computer architectures, the program counter, or PC, holds the address of the next instruction to be executed. When an instruction is executed, the program counter is typically incremented to point to the next instruction in memory, assuming no jumps or branches are specified by the executed instruction. If B0CD were an instruction that does not involve a jump or branch, the program counter would be incremented to the address of the instruction immediately following B0CD. If B0CD is a jump or branch instruction, the program counter would be updated to the target address provided within the instruction. It is essential to consult Appendix C or the specific documentation for the machine in question to determine precisely what the B0CD instruction does and how it affects the program counter.