IGNOU MCS 12 2026 2027 - Draw a diagram showing the Initial State of the machine with the addre

Question

Draw a diagram showing the Initial State of the machine with the addresses and content of memory locations in hexadecimal. Show only those address locations of the memory that store the instruction and data. Also, show the content of all the stated registers.

08 Aug 2026

Answer :

Word Count : 980

In Computer Organization and Assembly Language Programming, the initial state of a machine can be represented by showing the contents of the memory locations that contain the program instructions and data, along with the contents of the relevant processor registers. All addresses and data values are normally represented in hexadecimal notation because hexadecimal provides a compact representation of binary information. The diagram helps in understanding how instructions and data are arranged in memory before program execution begins. The initial machine state consists of two major components: the memory and the CPU registers. Memory contains the machine instructions and data required by the program. The CPU contains registers such as the Program Counter (PC), Instruction Register (IR), Accumulator (AC), Memory Address Register (MAR), Memory Data Register (MDR), and other general-purpose or status registers, depending on the architecture being considered. A general representation of the initial memory state is shown below: ```text INITIAL STATE OF THE MACHINE CPU REGISTERS ┌──────────────────────────────┐ │ PC = 1000H │ │ IR = 0000H │ │ AC = 0000H │ │ MAR = 0000H │ │ MDR = 0000H │ │ R1 = 0000H │ │ R2 = 0000H │ │ R3 = 0000H │ │ R4 = 0000H │ └──────────────────────────────┘ │ │ ▼ ┌───────────────────┐ │ MEMORY │ ├─────────┬─────────┤ │ Address │ Content │ ├─────────┼─────────┤ │ 1000H │ 2105H │ ← Instruction │ 1001H │ 3106H │ ← Instruction │ 1002H │ 4107H │ ← Instruction │ 1003H │ 0000H │ ← Instruction │ 1005H │ 0025H │ ← Data │ 1006H │ 0010H │ ← Data │ 1007H │ 0003H │ ← Data └─────────┴─────────┘ ``` In this representation, only those memory addresses that actually contain instructions or data are displayed. Empty or unused memory locations are omitted. This makes the diagram clearer and focuses attention on the locations involved in program execution. The first memory location, 1000H, contains the first instruction, represented by 2105H. The Program Counter contains 1000H, indicating that the next instruction to be fetched is stored

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