2110 FINAL REVIEW!!!!

Convert the following decimal number to hexadecimal (unsigned): 250

• xFA

• x7D

• xEA

• x7B

Which of the following additions of a pair of 4-bit two’s complement numbers causes overflow (select all that apply)?

• 1010 + 1011

• 0010 + 1001

• 1110 + 1100

• 0111 + 0100

What gate is this? If we add an inverter, then what gate would we have?

• NAND, OR

• NAND, AND

• NOR, OR

• NOR, AND

What does the circuit do?

• Negates A if B==7, negates B if B==0, outputs 0 otherwise

• Negates B if B==7, negates A if B==0, outputs 0 otherwise

• Negates A if B==7, outputs 0 if B==0, negates B otherwise

• Negates B if B==7, outputs 0 if B==0, negates A otherwise

Which of the following K-Maps has correct groupings? (Yellow-green and yellow-orange are overlaps.)

• 
• 
• 
• 

Typically, a register is an example of _______ logic and is made up of _______.

• Sequential, D Flip Flop
• Sequential, Gated D latch 

• Combinational, D Flip Flop

• Combinational, Gated D latch 

In a D flip-flop, what happens when the clock edge jumps from 0 to 1 and the input is high?

• The output becomes low

• The output remains unchanged

• The output follows the input

• Depends on the location of the not gate

What differentiates LD from LDI and LDR?

• LD directly loads the value from memory using a PC offset, LDR does the same with a base register offset, and LDI loads indirectly

• LDR directly loads the value from memory using a PC offset, LD does the same with a base register offset, and LDI loads through multiple memory accesses

• LDI directly loads the value from memory using a PC offset, LD does the same with a base register offset, and LDR loads through multiple memory accesses

• LD and LDR load indirectly while LDI performs a direct load

What is the range a LD instruction can access assuming PC* is at x3000 (we’ve already performed FETCH)?

• [x2F00, x30FF]

• [2E00, x31FF]

• [x2F00, x3100]

• [x2E00, x3200]

If an LC-3 program uses the directive .blkw 10, what happens in memory?

• A string of 9 characters is defined (1 null space)

• Ten addresses of memory(words) are reserved, uninitialized

• Ten addresses of memory(words) are reserved, all set to zero

• 10 bytes are allocated from the free list