Appendix A. Arithmetic Tables for a 4-Bit Machine

In the tables in Appendix A, underlining denotes signed overflow.

Table A-1.. Addition
           -8 -7 -6 -5 -4 -3 -2 -1
   0 1 2 3 4 5 6 7 8 9 A B C D E F
  0 0 1 2 3 4 5 6 7 8 9 A B C D E F
  1 1 2 3 4 5 6 7 8 9 A B C D E F 10
  2 2 3 4 5 6 7 8 9 A B C D E F 10 11
  3 3 4 5 6 7 8 9 A B C D E F 10 11 12
  4 4 5 6 7 8 9 A B C D E F 10 11 12 13
  5 5 6 7 8 9 A B C D E F 10 11 12 13 14
  6 6 7 8 9 A B C D E F 10 11 12 13 14 15
  7 7 8 9 A B C D E F 10 11 12 13 14 15 16
-8 8 8 9 A B C D E F 10 11 12 13 14 15 16 17
-7 9 9 A B C D E F 10 11 12 13 14 15 16 17 18
-6 A A B C D E F 10 11 12 13 14 15 16 17 18 19
-5 B B C D E F 10 11 12 13 14 15 16 17 18 19 1A
-4 C C D E F 10 11 12 13 14 15 16 17 18 19 1A 1B
-3

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