BCD arithmetic

Part 2


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| You recognize the pioneer  |
| by the arrows in his back. |
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While "BCD arithmetic, Part 1" aimed more at the innards
of the NMOS 6502, this article discusses/dissects
the concepts used in old ALU/adder ICs.
...Not to mention the Wang 700 calculator.

Warning:
This article doesn't cover all the basics,
because I assume that you already did
read BCD arithmetic, part 1.

9s complement basics
9s complement circuits
Wang 700 BCD correction
The 74582 adder
some +6/-6 circuits
The 100181 ALU
Excess 3, BCD, binary
Excess 3 adder

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