2119Re: [cosmacelf] Re: HP 5082-7640 Replacements
- May 5, 2004
>Yes, I remember paying the same for mine in 1977 or so. I grumbled a
> Hex displays always were expensive. ISTR the ones I bought for my
> Quest Elf were at least $15 each in 1979.
bit because TIL311's were cheaper then, too, about $10-12.
>Yes, the TIL-311's are still available from many hobbyist vendors. One
> I've had luck with occasionally finding them on ePay. One auction had
> a lot with two HP 5082-7640s, four TIL-311s and a couple of DS1417s (4
> char ASCII displays as seen in the Rockwell AIM-65). I don't think I
> paid more than $30 for the entire set, incl. S&H. TIL-311s (or
> equivalents) are rather common to find. The HPs are the rarer ones.
advantage of the recent downturn, though, is that a lot of the
distributors who wouldn't deal with small lots before will do so now.
As a person whose business involves turning out small lots of
engineering prototypes this has helped me out quite a bit as well.
>I use the TIL-311's in the Elfs my students build, largely because I
> Still... it's nice to know that you can still find the original
> form-factor, though. Personally, I'd use TIL-311s in anything except
> a Popular Electronics design... they are slightly larger, easier to
> find, and, IIRC, have a seperate power input for the LEDs (for
> low-power designs)
want it to be easy for them to get replacements after they leave my
class. This year we're probably going to add the seperate switch for
the LED power to take advantage of the seperate logic and LED supplies
on the TIL311, since once we move on to using a terminal the hex
display is seldom referred to. I've considered making the display turn
off under logical control, maybe in a future rev.
It is nice that the original display is still availble. It's such a
nice part, but _extremely_ expensive. I wish I could get into the
disposal chain for old large-chassis HP3000's and HP9000/800's, they
had a small console that used the hex displays as well as several other
interesting components. Not to mention all the MSI parts, 8-bit CPUs,
etc. on the boards inside the chassis. Unfortunately, most of these are
being crushed for materials recovery when they are disposed of.
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