Motorola M68000 User's Guide download pdf (Page 27)

Mumber Systems 13

terminals. The IBM PC, which does not use the 68000, makes extensive

use of such an extended character set. You should be aware that these

special character sets are not part of the ASCII standard, when you use

these codes, your programs will not necessarily be useful on all comput

ers, even though they use the 68000 microprocessor.

Exercises

1. Binary numbers are based on powers of_________

2. Give the decimal equivalent of the following binary numbers: a)

11100010 b) 111111 c) 10000000

3. Convert the following decimal numbers to binary: a) 126 b) 255

c) 100

4. Convert the following binary numbers to hexadecimal: a) 11111111

b) 10000 c) 11000101

5. Convert the following hexadecimal numbers to binary: a) 55 b)

AB c) EE

6. Give the decimal equivalent of the following hexadecimal numbers:

a) FF b) 55 c) DE

7. Perform the following binary additions:

a) 110000 b) 01111

+ 001111 + 11100

8. Perform the following hexadecimal additions:

a) FFAA b) 0123

+ A100 + A5EE

9. Perform the following binary subtractions:

a) 11111 b) 11001

- 00101 - 10000

10. Perform the following hexadecimal subtractions:

a) FFFF b) 12AA

- AAAA - 02AB

11. How many bits are there in a byte?

12. How many bytes are contained in a 68000 word?

13. The 68000 uses what method to represent negative numbers?

14. Which bit is the sign bit?

15. If a number is negative, what is the binary value of the sign bit?

16. Convert the binary number 00111101 to an equivalent negative num

ber.

17. What is the decimal equivalent of 11110000 in signed binary?

18. What is the equivalent of —100 decimal in a signed hexadecimal byte?

19. What number bases are convenient to use when programming the

68000?

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Motorola M68000 User's Guide Page 27