Question

5) True or False. HALT is actually a TRAP instruction. Using operate type instructions only place the value 45 in RI . 6) 7) True or False. In a Von Neumann machine data and instructions both reside in memory. What is the opcode for GETC in LC-3. 8) (i)True or False. In LC-3 all memory can be accessed with 16 bits. G) Give the decimal value for this 2's complement bit pattern: 111111110001 (k) Give the decimal number 119 as a number in base 5. (1) What is the range of values that can be represented with 16 bits in two's complement format.

Answer 1

Ans 6)  Follwing instruction places 45 (2D in hex) in R1

mov r1,#2DH

Ans 7) Von Neumann architecture is based on the stored-program computer concept, where instruction dataand program data are stored in the same memory. TRUE

Ans 8) GETC is itself an opcode. Its operation is to read one character from keyboard. It is equivalent toTRAP x20.

Ans i) The LC-3 specifies a word size of 16 bits for its registers and uses a 16-bit addressable memory with a 2¹⁶-location address space. TRUE

Ans j) Given:

1 1 1 1 1 1 1 1 0 0 0 1

One's Complement- 0 0 0 0 0 0 0 0 1 1 1 0

  +1

Two's Compliment- 0 0 0 0 0 0 0 0 1 1 1 1

Ans k) 5 | 119

5 | 23 4

5 | 4 3

So ( 119 )base10 => ( 434 )base5

Ans l) 2's compliment represent positive range

0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

From above range of two's compliment is 0 - 32767

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