Addition

From: Jack Peacock <peacock_at_simconv.com>
Date: Tue Apr 21 12:30:37 1998

>>
>> Could someone tell me what the configuration of individual gates
>> is (one of them, at least) for binary addition (or provide an EASY
>> TO FIND reference)?

> I'll give you the equations, you can draw the gates yourself (it's
> getting late...)

> lots of stuff about adders

There is a much easier one chip solution, the brute force approach.
Take a TTL PROM, size dependent on how big an adder you need, use the
address lines as terms A and B, and use the outputs as the result. For
instance, for a 4 bit adder, use a 256x8 TTL PROM, lower 4 address bits
are A, upper 4 are B, and the 8 output lines are the result (only 5
used, 4 plus carry). Program the PROM with all the possible results.
You can also make a poor man's multiplier or divider the same way. For
a multiplier all 8 output lines would be used.
        Jack Peacock
Received on Tue Apr 21 1998 - 12:30:37 BST