fredj at nortext.com
Mon Mar 21 10:55:30 EST 2005
On Mar 21, 2005, at 10:31 AM, Stephen M. Webb wrote:
> On 20/03/05 11:29 pm, Jeff 'Alias' East wrote:
>> On Sun, Mar 20, 2005 at 11:11:30PM -0500, Frank Stratton - VE3YY
>>> This is a true story!
>>> At one time believe it or not, a computer manufacturer I worked for,
>>> looking into having a piece of memory represent three states, zero,
>>> and not (zero or one). Memory was so expensive when I was first
>> I was learning about tri-state chips a few years back, and the same
>> thought occured to me. I called it "Trinary".
> Ternary logic is a frequent occurrence in computers. Some examples:
> o tri-state behaviour of various devices on a bus (high, low,
> This includes memory as well as ISA, PCI, and USB buses.
> o SQL uses ternary logic frequently. For example, a boolean column
> in a
> table might have the values true, false, or null. One of the first
> you used to have to do (and I don't know if things have changed over
> decades) when learning SQL was to master the ternary logic of query
> o The C programming languages uses ternary logic frequently. A lack of
> understanding of its ternary logic is a main cause of buffer overrun
> The list goes on, but ternary logic is certainly nothing special. I
> even use
> it with my kids and they understand it. ("yes", "no", "go ask your
Apparently your kids understand because 'human neurons compute in
trinary' therefore 'the human brain is able to ignore information' .
Most parents (and spouses) already know this.
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