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 Post subject: Re: Any calculator collectors out there?
PostPosted: Sep Mon 06, 2021 3:16 am 
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Location: Erie, PA
Very nice examples in this thread!

This HP-25 has been the "daily driver" at my desk. I work at a university, and found it a few years ago in an E-scrap bin. Cleaned up the gassed out Nicads, and got it working again. I have several other old HP's including an HP 87 and a HP 85 computer.

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Here's an interesting one I have. This is a Monroe badged Compucorp that uses a customized cassette deck to store programs.

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60603902_2467010919985460_4132920795557003264_n.jpg [ 776.29 KiB | Viewed 712 times ]


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 Post subject: Re: Any calculator collectors out there?
PostPosted: Sep Mon 06, 2021 5:39 am 
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Location: Greater Boston, MA
CurtisL wrote:
I have my Dads HP-35 as well as my own TI SR-10. In college I borrowed Dads HP a few times but hated the RPN. Dad got me the SR-10 as a birthday gift ($150 then). I think he didn't want to loan his HP out; I never told him how much I disliked it. Dad got a letter from HP saying there was an error in the calculation in some cases, and offered to replace some chip inside. He did send it back and they replaced whatever was causing the issue. It was a $400 calculatior at that time.
It was an error in the ROM that resulted in some calculations being incorrect. HP replaced the ROM chips under warranty.

About a dozen years ago, I bought an HP35 on the 'bay from the original owner, who saved all the documentation (including a letter like your dad's) as well as the case. I know enough RPN to do basic arithmetic and that's it.


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 Post subject: Re: Any calculator collectors out there?
PostPosted: Sep Mon 06, 2021 2:01 pm 
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Location: Oakland Township, Michigan
This is my Bowmar "Brain" 901B, the first calculator to use a numeric LED display. I've had it since 1974. The well-heeled gentleman that gave it to me (batteries wouldn't take a charge) purchased it in 1972.

The solder touch-up seen inside is not my handiwork. It came from the factory that way. I have the original wall wart, but apparently the capacitor inside it is open. I also have the manual and case.

As you can see, it still works.

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 Post subject: Re: Any calculator collectors out there?
PostPosted: Sep Tue 07, 2021 12:57 pm 
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Matt Kroll wrote:
This is my Bowmar "Brain" 901B, the first calculator to use a numeric LED display. I've had it since 1974. The well-heeled gentleman that gave it to me (batteries wouldn't take a charge) purchased it in 1972.

The solder touch-up seen inside is not my handiwork. It came from the factory that way. I have the original wall wart, but apparently the capacitor inside it is open. I also have the manual and case.

As you can see, it still work


I have a couple of the early Bowmars in my stash, and opening them up is a lesson in factory bodges and rework. In the days prior to "all on one chip" handhelds, Bowmar really struggled to make a profit with their products, even in high demand. Their cases and keyboard quality were, shall I say, "less than stellar." I donated one of my Bowmars the the early computer technology exhibit at our planetarium.

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 Post subject: Re: Any calculator collectors out there?
PostPosted: Sep Tue 07, 2021 1:58 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: dayton oh usa
i have one similar.
suffers from severe keybounce.
and i bet yours depends on having a good battery pack to act as the filter cap.
they saved 2 cents!


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 Post subject: Re: Any calculator collectors out there?
PostPosted: Sep Wed 08, 2021 11:49 pm 
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Posts: 888
Location: Westford, MA USA
787Geoff wrote:
Some more:

But one of my favourites is the Casio PRO fx1 with card reader!

Very impressive HP collection! That fx1 is interesting as well. I already showed the fx29 I found recently, so here's a picture of a small HP collection I bought a couple of years back:
Attachment:
File comment: From left to right: HP 67, HP 65, HP 48SX
hpcalcs.jpg
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And here are the TI calculators I got in the same bundle:
Attachment:
File comment: From left to right: a TI-74 and a TI-95, an LCD Programmer, and four TI-59s
ticalcs.jpg
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And I know they're a bit off-topic, but here are some HP 'palmtops' I got along with them:
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File comment: From left to right: HP 200LX 2MB, HP 360LX
palmtops.jpg
palmtops.jpg [ 223.07 KiB | Viewed 616 times ]

MarkPalmer wrote:
Here's an interesting one I have. This is a Monroe badged Compucorp that uses a customized cassette deck to store programs.

-Mark-

Very cool! I've always been curious about those Compucorp/Monroe models. One of the first programmable scientific desktop calculators, though pretty far from pocket sized. Desktop scientific calculators seem to be hard to find, for some reason.

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 Post subject: Re: Any calculator collectors out there?
PostPosted: Sep Thu 09, 2021 4:38 am 
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Posts: 24
Do your card readers work on the 65 and 67? You did well with the HP stuff!

Also, the cost of a 65 in 1973 was 900 USd which is 5400 in todays dollars according to the inflation calculator!

WIP (work in progress): a book on the restoration of HP calculators. Also wrote a monogram (35 pages) on the restoration of an HP65 for Datafile. A journal resident at the Imperial College library for the second oldest computer club in the world.

https://www.bankofcanada.ca/rates/related/inflation-calculator/

Make sure you check out the notes section of the video for a full explanation of the interaction of the data to a running program.

You might notice, the FX Pro1 cards have perforations at the bottom of the cards. A friend of mine makes these. They are used in an optic circuit for timing the card as you manually pass by the reader.


Attachments:
File comment: The work in progress, all 13 families of the HP calculators up to the 48 series.
2F38C0D6-DCF3-4DCC-8091-5203F031EB9F.jpeg
2F38C0D6-DCF3-4DCC-8091-5203F031EB9F.jpeg [ 333.46 KiB | Viewed 603 times ]
File comment: Special edition featuring an HP 65 restoration.
E825F2D2-1A09-43AE-B3C8-CD0F8AEE63EB.jpeg
E825F2D2-1A09-43AE-B3C8-CD0F8AEE63EB.jpeg [ 665.54 KiB | Viewed 603 times ]


Last edited by 787Geoff on Sep Thu 09, 2021 5:10 pm, edited 1 time in total.
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 Post subject: Re: Any calculator collectors out there?
PostPosted: Sep Thu 09, 2021 1:02 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1239
Location: St. Louis, MO, USA
I still have my trusty HP 25 I used in grad school 43 years ago.

Dennis


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 Post subject: Re: Any calculator collectors out there?
PostPosted: Sep Thu 09, 2021 5:05 pm 
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A modified HP 29C with GPS integrated into the program ability (can call data from the GPS and use it in a running program). Real time clock, one hundred 98 line programs blocks available and are fully can be fully merged (linked) for larger then 98 line programs. Buzzer and alarm plus stopwatch. Low power board which allows constant display of the LED time mode without using up the battery. Alpha numeric capabilities and infrared printing to an HP portable IR printer.

Sort of bringing 1976 into the 21st century.

YouTube video I did over the Atlantic in a B777-300:

https://youtu.be/5BQYFztvq5E

Remember to check out the comment section of the video for a full explanation of the program in action, the new ACT chip by my friend and the integration of the GPS.


Attachments:
File comment: Zulu time
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File comment: North latitude
0DA76EB7-D45F-4B0A-8F08-353B4E6B4F66.jpeg
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File comment: West longitude
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File comment: Speed in knots or kph, your choice; knots.
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File comment: Heading in true (actually true track)
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8E81DD02-EB5F-4215-85C5-6E44ED7AE8AB.jpeg [ 1.85 MiB | Viewed 570 times ]
File comment: Altitude in meters or feet, your choice: meters here
819EA5E1-6C12-4558-9700-E57A34B150FE.jpeg
819EA5E1-6C12-4558-9700-E57A34B150FE.jpeg [ 1.85 MiB | Viewed 570 times ]
File comment: Number of satellites pinged
FEB46167-D50C-4A66-9F41-110A2BD010C3.jpeg
FEB46167-D50C-4A66-9F41-110A2BD010C3.jpeg [ 1.81 MiB | Viewed 570 times ]
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 Post subject: Re: Any calculator collectors out there?
PostPosted: Sep Sat 11, 2021 9:25 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1022
Location: Cedar Rapids, Iowa, USA
I have an HP-65 from college in 1976, with a broken wire from the main board and a bad display segment. I never could find a detailed picture of its insides. I was never happy with the battery life, either. But it did introduce me to RPN and programming.
John


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 Post subject: Re: Any calculator collectors out there?
PostPosted: Sep Sun 12, 2021 7:38 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1275
Location: Pasadena CA USA
This started me thinking about a program that I wrote for the HP-41 back in the 1980s. Pushing the "user" button switched the calculator to complex number mode. The stack worked exactly as the calculator worked for real numbers. The display would display the entire number, i.e. 25 + j40 or 56 <22. You could enter numbers as polar or rectangular interchangeably and choose the output format. You could change the output format at will. Almost all of the keys worked the same as if the calculator was in normal mode. There were three keys that were changed to +j, -j and <, but I can not recall which three they were.


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 Post subject: Re: Any calculator collectors out there?
PostPosted: Sep Mon 13, 2021 7:55 pm 
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My Panasonic 860. Has a vacuum fluorescent display and requires 4 AA batteries. I purchased this new about 1972 while stationed in Thailand with the US Air Force. Still in use after nearly 50 years!

Les


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 Post subject: Re: Any calculator collectors out there?
PostPosted: Sep Tue 14, 2021 2:01 pm 
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I remember a comment from a radio DJ at the eve of 1980:
"The 1970's will be noted as the decade when everyone could afford to have their own calculator."
Just imagine life before 1970.

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 Post subject: Re: Any calculator collectors out there?
PostPosted: Sep Wed 15, 2021 4:21 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 2782
Location: Saskatoon
Phil Coe wrote:
I remember a comment from a radio DJ at the eve of 1980:
"The 1970's will be noted as the decade when everyone could afford to have their own calculator."
Just imagine life before 1970.

Yeah. People could do math with a pencil and paper.


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 Post subject: Re: Any calculator collectors out there?
PostPosted: Sep Wed 15, 2021 12:59 pm 
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BobWeaver wrote:
Phil Coe wrote:
I remember a comment from a radio DJ at the eve of 1980:
"The 1970's will be noted as the decade when everyone could afford to have their own calculator."
Just imagine life before 1970.

Yeah. People could do math with a pencil and paper.



I have my grandpa's slide rule?!?! Does this count?

Image


Todd


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 Post subject: Re: Any calculator collectors out there?
PostPosted: Sep Sat 18, 2021 1:39 am 
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Location: Lexington, KY, USA
Here's one you won't see everyday, an HP-46 - the marriage of an HP-45's brains (and a few other features) with electro-mechanical printing guts. Complete with RPN. Still works fine, but could use a ribbon. Yes, a black/red ribbon! None of that icky, expensive thermo-sensitive paper that fades in a few years.


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hp46.jpg
hp46.jpg [ 903.17 KiB | Viewed 330 times ]
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 Post subject: Re: Any calculator collectors out there?
PostPosted: Sep Sat 18, 2021 2:52 am 
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Location: Montreal, Quebec
Inremember seeing an HP desktop at a hamfest. But it was more like a pocket calculator, small keys, in a desktop case.

Anyone have a Sinclair calculator? Clive just died.


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 Post subject: Re: Any calculator collectors out there?
PostPosted: Sep Sat 18, 2021 4:33 am 
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I have three fully functional Cambridge programmables, one silver sovereign and one black sovereign. An article at the BBC credited Clive with inventing the calculator, well that was extremely pushing it. The scientific and programmables were known for their poor accuracy.


Quote:
I remember seeingā€¦ham fest



This or this:


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 Post subject: Re: Any calculator collectors out there?
PostPosted: Sep Sat 18, 2021 4:37 am 
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OldHack wrote:
Here's one you won't see everyday, an HP-46 - the marriage of an HP-45's brains (and a few other features) with electro-mechanical printing guts. Complete with RPN. Still works fine, but could use a ribbon. Yes, a black/red ribbon! None of that icky, expensive thermo-sensitive paper that fades in a few years.



Ha, great, just restored one replacing two led blocks. Replaced caps in power supply as well as lubricating all printer parts. Ribbons are available, just installed one.


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F554E9B8-D2D6-4B10-9D71-2586BD6F552E.jpeg
F554E9B8-D2D6-4B10-9D71-2586BD6F552E.jpeg [ 292.86 KiB | Viewed 315 times ]
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 Post subject: Re: Any calculator collectors out there?
PostPosted: Sep Sat 18, 2021 6:53 am 
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Excellent work 787Geoff. I use my HP 85 calculator/computer with HPIB interface and companion 9121D disc drive to control and data log from several of my 1980's era pieces of test equipment- all just in the name of fun more than any necessity ;) I have a HP 1000/2113B 16 bit 8 unit serial timeshare minicomputer also, running RTE-6VM when it reluctantly wants to.

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-Mark-


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