Yes, it was 'Point Of Sale' hardware. I bought both minicomputers, ten in counter LASER scanners along with 14 cash registers and 14 printers. Two complete systems, from two stores..They threw in two chargers and an electric pallet jack, all for $100. I scraped the scanners for the LASER tubes and power supplies. I sold them for $400, and I got about $75 for the machined aluminum housings. The profits went to more equipment for the shop, at the Orlando Hamfest.
I take it POS stands for Point Of Sale, not Piece Of S***.? When I was in engineering school in the 1980s, we used the DEC Pro 350 computers, and they actually had an operating system called pOS!? Not a well thought out name!? ? ? ?Jim Ford?
Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------
Date: 11/8/21 12:33 AM (GMT-08:00)
Subject: Re: [HP-Agilent-Keysight-equipment] Placing Shelf on Casters for HP Equipment
There are also 23" wide racks that came from the Telco industry.
I have two, dual sized enclosed racks They are 19", but you can remove the doors and side panels, then turn it 90 degrees to use it as a 23" rack.
They are from some long gone National Semiconductor Datachecker POS systems that were scrapped 25 years ago.
On Sun, Nov 7, 2021 at 10:31 PM Dave McGuire <
mcguire@...> wrote:
On 11/7/21 8:38 PM, Matt Huszagh wrote:
> I googled "HP test equipment rack" and the 19" rack popped up. I have
> seen these before, though I didn't know the term (or know that it was a
> standard). I also did not know that these are what HP, Agilent and
> Keysight use for their test equipment racks.
? ?Well, they followed the 19" rack standard.? Just like all of the
computer manufacturers (HP included) followed it too.
? ?The vernacular: One "rack U" (rack unit) is 1.75".? A "1U"
rack-mounted device is 1.75" tall, a "2U" chassis is 3.5", etc.? About
95% of the hardware you'll run across, test equipment and server-class
computers alike, is sized in these increments.? Soon you'll be able to
recognize them on sight and plan out your rack space allocations: "Oh, I
see that HP 3325A is a 3U box".? "Ah, I can put a 1U file server right
here".
? ?Look for a picture of the front one of these racks, empty, and look
at the holes facing you on the left and right.? Notice the spacing
pattern of the holes.? It looks irregular, but if you stare at it for a
moment you'll see that they're spaced out for 1.75" increments.
? ?All of this works amazingly well, and you will love it.
? ?This isn't just test equipment stuff.? If you haven't ever seen a
datacenter in person, surely you've seen pictures of them.? Those are
the same racks.
? ?Keyboardless synthesizers, signal processors, and amplifiers in
recording studios and on on concert stages...same racks.
? ?AT&T came up with this standard for telephony equipment in
1922...Yes, 99 years ago.
> I'm not sure if this is a good excuse but I'm relatively young (< 30)
> and only been doing electronics for the last couple years, when I
> started teaching myself. I also don't come from an engineering
> background, so I've probably missed some things that are evident to
> others in the field. I did study physics undergrad though, and research
> is one of the places I've come across these. But, none of us were too
> concerned that these were called 19" racks.
? ?It's not a good excuse. ;)? But it's never too late to catch up, and
you can fill in all of the knowledge blanks here.
? ? ? ? ? ? -Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
Michael A. Terrell