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'[OT] Display Code B'
2005\03\31@211604 by Jinx

face picon face
Just curious - What is/was the purpose of Code B for 7-seg displays ?

0 to 9 -  E  H  L  P  blank

Googling refers to it but not (that I can see) an explanation

I'm sure HELP wasn't intentional

===============================================
If you aren't part of the solution, you're part of the precipitate



2005\03\31@215727 by Vlad

flavicon
face
On Fri, Apr 01, 2005 at 02:15:52PM +1200, Jinx wrote:
> Just curious - What is/was the purpose of Code B for 7-seg displays ?

It imagine a code B driver would be useful in situations where a
microcontroller (where one is free to create custom character maps) is
not available, and regular drivers like the 7447/4511's hex output is not
desirable.

Negative sign and leading blank seem especially useful, but I've never
used one.


FYI for others...

Code B provides a negative sign, some letters and a blank for leading
zeros to be blanked when multiple displays are used

DEC     0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
HEX     0 1 2 3 4 5 6 7 8 9 A  B  C  D  E  F
CODE B  0 1 2 3 4 5 6 7 8 9 -  E  H  L  P  (blank)

-v

2005\03\31@221444 by Jinx

face picon face
> Negative sign and leading blank seem especially useful, but I've
> never used one.

Nor me, just the hex drivers. The - and blank would be useful.
There must be a story behind the E H L P. Code B, still available
in driver ICs, was around in the 80s so its origins must be at least
20 years ago

2005\03\31@231546 by Marcel Duchamp

picon face
Jinx wrote:
>>Negative sign and leading blank seem especially useful, but I've
>>never used one.
>
>
> Nor me, just the hex drivers. The - and blank would be useful.
> There must be a story behind the E H L P. Code B, still available
> in driver ICs, was around in the 80s so its origins must be at least
> 20 years ago
>

er, uh, 70's, ya whippersnapper!
MD


'[OT] Display Code B'
2005\04\01@034727 by Alan B. Pearce
face picon face
>> Negative sign and leading blank seem especially useful, but I've
>> never used one.
>
>Nor me, just the hex drivers. The - and blank would be useful.
>There must be a story behind the E H L P. Code B, still available
>in driver ICs, was around in the 80s so its origins must be at least
>20 years ago

I seem to recall that this combination was originated by HP for some reason.
I cannot recall it, but it may have been used on one of their instruments.

2005\04\01@034912 by Jinx

face picon face
> > Nor me, just the hex drivers. The - and blank would be useful.
> > There must be a story behind the E H L P. Code B, still available
> > in driver ICs, was around in the 80s so its origins must be at least
> > 20 years ago
> >
>
> er, uh, 70's, ya whippersnapper!

And the reason for Code B is.....drum roll, sharp intake of breath....

2005\04\01@104546 by Marcel Duchamp

picon face
Jinx wrote:
>>>Nor me, just the hex drivers. The - and blank would be useful.
>>>There must be a story behind the E H L P. Code B, still available
>>>in driver ICs, was around in the 80s so its origins must be at least
>>>20 years ago
>>>
>>
>>er, uh, 70's, ya whippersnapper!
>
>
> And the reason for Code B is.....drum roll, sharp intake of breath....
>

Heck, I don't know. I just was making a pedantic comment. I can offer
lots of guesses about E H L P origins but don't know of an authentic
urban legend about it.  Maybe we should all think up some fantastic
story about it and get it circulating on the net... somebody has got to
start those legends, ya know?

2005\04\01@110016 by Paul Hutchinson

picon face
> -----Original Message-----
> From: spam_OUTpiclist-bouncesTakeThisOuTspammit.edu On Behalf Of Jinx
> Sent: Thursday, March 31, 2005 9:16 PM
>
> Just curious - What is/was the purpose of Code B for 7-seg displays ?

It's simply a standardized 4 bit font for use on 7-seg displays.

If you can convince the marketing weenies to use it, then its availability
built into driver chips can take some load off the micro. Of course the
marketing types I encounter always want the product to look different so
they never let me use Code B. Sometimes they want extra characters available
but a few times they just didn't like the Code B character shapes for 6 and
9 :-(.

Paul

>
> 0 to 9 -  E  H  L  P  blank
>
> Googling refers to it but not (that I can see) an explanation
>
> I'm sure HELP wasn't intentional
>

2005\04\01@132610 by Paul James E.

picon face

E, H, L, P   Error, High, Low, Pulse
Works really well for a logic probe.

Regards,

Jim



>> Negative sign and leading blank seem especially useful, but I've never
>> used one.
>
> Nor me, just the hex drivers. The - and blank would be useful.
> There must be a story behind the E H L P. Code B, still available
> in driver ICs, was around in the 80s so its origins must be at least 20
> years ago
>
> --

2005\04\01@165806 by Jinx
face picon face
>  E, H, L, P   Error, High, Low, Pulse
>  Works really well for a logic probe.

A-ha, thanks

> If you can convince the marketing weenies to use it, then its
> availability built into driver chips can take some load off the
> micro

One of the reasons I asked is because the ICM7211, for example,
has had a Code B version forever (the ICM7211A not B !!), but
I've never seen in any literature why or what it could be used for

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