| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1198.1 | | ALLVAX::ROTH | It's a bush recording... | Mon Feb 26 1990 20:37 | 7 |
| Probably a so-called Gray code - a binary code where only one bit
changes between consecutive code words.
Nice for flash A-D converters since you won't get glitches from
multiple bits changing (though there are other ways of handling this...)
- Jim
|
| 1198.2 | | BEING::POSTPISCHIL | Always mount a scratch monkey. | Tue Feb 27 1990 11:37 | 11 |
| Re .0:
Gray code:
000, 001, 011, 010, 110, 111, 101, 100, . . .
Was that puzzle "The Brain" (clear circular plastic with black pegs) or
the "Hexadecimal" wooden sliding puzzle?
-- edp
|
| 1198.3 | | THRUST::THISSELL | George Thissell | Tue Feb 27 1990 11:59 | 9 |
| thank you for your responses. i had a feeling that the code meant
sometype of hunt-and-peck meaning to it.
The puzzle was "the apple", I believe. Clear plastic pieces that
fit together to form the shape of an apple. The directions said to
try and if you couldn't solve it, to try the "Gray's Binary" approach,
which equates to the hunt and peck method.
George
|
| 1198.4 | | PAXVAX::THISSELL | George Thissell | Tue Feb 27 1990 14:28 | 11 |
| > Was that puzzle "The Brain" (clear circular plastic with black pegs) or
> the "Hexadecimal" wooden sliding puzzle?
I stand corrected. I am told it was "The Brain". I thought it was on
another puzzle.
Were you able to solve it ? Did you use Gray's Binary ???
George
|
| 1198.5 | | BEING::POSTPISCHIL | Always mount a scratch monkey. | Wed Feb 28 1990 11:13 | 27 |
| Re .4:
The pegs on The Brain are numbered 1-8. Starting with all pegs in, you
move peg 1. (By "move a peg", I mean move it out if it is in and move
it in if it is out.) On every alternate move, you move peg one:
1 _ 1 _ 1 _ 1 _ 1 _ . . .
On the remaining moves that aren't filled in above, every alternate
move is peg 2:
1 2 1 _ 1 2 1 _ 1 2 . . .
Then fill in 3's, 4's, 5's, 6's, 7's, and an 8.
Actually, the mechanics of the puzzle are such that only one or two
pegs can move at a time. If you are at the beginning or end of the
chain, only the 1 peg will move. At all other times, the 1 peg and one
other peg will move. All you have to do is move whichever movable peg
you didn't just move.
Some people have a knack for the sequence and can perform all 170 moves
in less than 30 seconds. Stop by ZK sometime and I'll show you. (I
have the puzzle here.)
-- edp
|
| 1198.6 | Not only flash A-D converters | EICMFG::DAVIES | feature(X) :- bug(X), documented(X). | Thu Mar 01 1990 08:16 | 12 |
|
re .1
> Nice for flash A-D converters ...
Actually, the first time I saw a Gray code in use was on a
shaft encoder (electro-mechanical). Not exactly the 'flashest'
ADC. Gray codes are perfect for this type of device - glitches
are a very real problem.
/David.
|
| 1198.7 | My Experiences with the Brain | WOOK::LEE | Wook... Like 'Book' with a 'W' | Thu Mar 01 1990 18:22 | 6 |
| I used to be able to do the Brain under 30 seconds. Once you get the
hang of it, the two-fisted approach is probably the fastest way. I
haven't had my hands on a well greased (use spray silicone) Brain for a
number of years.
Wook
|