tpeters at mixcom.com
Wed Mar 7 14:00:20 CST 2007
At 10:26 PM 3/6/2007 -0500, you wrote:
> > My great treasure is a box of Burroughs 7971 nixies. [...]
> > They have 15 segments each making designing for them a challenge.
>15? I'd naïvely expect to see eight segments radiating from the
>centre, to the corners and the centres of the edges, and eight more
>segments around the edge, for a total of 16. Are two of them joined or
Nope. 15 segments addressable. Segments 1, 2, 3, 4, 5, and six form the
outside box, from top going clockwise. Two for each side, one across the
bottom (4) and top. Then the verticals (split) and horizontals. Then a
diagonal in each quadrant. Then the "cursor," a sort of flattened caret
under all the other segments. Picture an inverted V, but with a flat
instead of a point, an as wide as the other segments.
They have another tube, the 5971, that has no caret and no split center
vertical, thus 13 segments. But the 8971 and 7971 have 15.
> > What I want it a device I can build with a PIC or two that will
> > display the time and maybe the temp, plus a scrolling alpha numeric
> > message uploaded to it via a USB port.
>Since you'll have to have a host on the other end of the USB line,
>maybe just upload a stream of 16-bit values (well, 15-bit values, but
>padding them to 16 bits each is probably easist) and let the host deal
>with character generation?
> > I see USB port boards for PIC use all over the place, but I'm fairly
> > daunted by the prospect of designing a circuit flexible enough to
> > drive 6x15 segment nixies. Maybe a character generator in addition
> > to the main PIC??
>Why bother? Why not just generate 15-bit values for display, rather
>than generating 7-bit values that mean something to a human looking at
>an ASCII table and then contriving external hardware to convert them to
>the 15-bit values the hardware actually needs?
>/~\ The ASCII der Mouse
>\ / Ribbon Campaign
> X Against HTML mouse at rodents.montreal.qc.ca
>/ \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B
207. [Government] Government is like a baby. An alimentary canal with a big
appetite at one end and no sense of responsibility at the other. --Ronald
--... ...-- -.. . -. ----. --.- --.- -...
tpeters at nospam.mixcom.com (remove "nospam") N9QQB (amateur radio)
"HEY YOU" (loud shouting) WEB: http://www.mixweb.com/tpeters
43° 7' 17.2" N by 88° 6' 28.9" W, Elevation 815', Grid Square EN53wc
WAN/LAN/Telcom Analyst, Tech Writer, MCP, CCNA, Registered Linux User 385531
More information about the cctalk