A. Show the representation of each of the following signed integers using (a) signed magnitude, (b) 1s complement, (c) 2s complement, and (d) excess-64 notations. Use 7 bits for each representation.

1. 43

2. -50

B. Show the IEEE 754 (single precision) bit patterns for the following decimal numbers

1. -0.002

2. 1000

C. Perform the following additions using 7-bit 2s complement binary representation. Specify if there is an overflow.

1. 49 + 4

2. -44 + 44

3. -4 - 62

D. Identify both the mask and the Boolean operation needed to accomplish each of the following objectives.

1. Put 1s in the middle four bits of an eight-bit pattern without disturbing the other bits.

2. Take the complement the first four bits of an 8-bit pattern without changing the other bits.

3. Clear all but the least significant bit of an 8-bit pattern without disturbing the least significant bit.

4. Change an uppercase ASCII code character to its corresponding lowercase code.

please show steps for better understanding of process.