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Early (earliest?) HP-41C find.
12-08-2018, 05:44 PM
Post: #21
RE: Early (earliest?) HP-41C find.
Hi all,

Since some of you had showed interest in them, I've finally decided to put some items for sale, including this HP-41C prototype and the unique STO. DOMINGO ROM module.

Check tomorrow evening (sure you can find where :-)

Xmas sale is open!

Enjoy.

Best from the Canaries.

Diego.

Note: I'm about to turn 60 next month, that's why you'll find "59.9" figures all over. ;-)

"Do not suppose, check it twice."
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08-30-2019, 11:13 AM (This post was last modified: 08-31-2019 07:00 AM by CY-CL.)
Post: #22
RE: Early (earliest?) HP-41C find.
One week ago, was sold on eBay another prototype. It was declared as 1901A00043, but this is not correct, because the backside is from a production run “warranty” HP-41. And the CPU-Board contains three NUT Rom’s from a later production date as them from 1916A00066 Prototype.

The correct S/N would about 1916A00100 regarding the production date from the NUT Rom's.
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08-30-2019, 07:23 PM
Post: #23
RE: Early (earliest?) HP-41C find.
Do you have the bays number of the auction, please?
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08-30-2019, 07:31 PM (This post was last modified: 08-30-2019 07:33 PM by CY-CL.)
Post: #24
RE: Early (earliest?) HP-41C find.
Sure; the auction number is: 123884788017
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08-30-2019, 08:38 PM
Post: #25
RE: Early (earliest?) HP-41C find.
Can not find it. No longer viewable on the bay?
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08-30-2019, 09:21 PM
Post: #26
RE: Early (earliest?) HP-41C find.
(08-30-2019 08:38 PM)HP-Collection Wrote:  Can not find it. No longer viewable on the bay?

https://www.ebay.com/itm/123884788017?Vi...3884788017

Greetings,
    Massimo

-+×÷ ↔ left is right and right is wrong
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08-30-2019, 09:58 PM (This post was last modified: 08-30-2019 10:00 PM by HP-Collection.)
Post: #27
RE: Early (earliest?) HP-41C find.
Ok, so the earlies proto ist still in your hand CY-CL?
Here is Jürgens description:

https://calc.fjk.ch/hp-41-prototyp/

But I agree: the non working calc is not worth that price Wink
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08-31-2019, 12:57 PM
Post: #28
RE: Early (earliest?) HP-41C find.
Has anyone been able to do a bug check on the D-D-D rom images with this earliest HP 41 ? Presumably the important bugs 2 and 3 and there, but anything else found?
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08-31-2019, 06:56 PM
Post: #29
RE: Early (earliest?) HP-41C find.
(08-31-2019 12:57 PM)Gene Wrote:  Has anyone been able to do a bug check on the D-D-D rom images with this earliest HP 41 ? Presumably the important bugs 2 and 3 and there, but anything else found?

See posts #12, #14 and #15 of this thread.
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08-31-2019, 07:11 PM
Post: #30
RE: Early (earliest?) HP-41C find.
Oops and ty. I missed those somehow. Thanks for the pointer!
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03-09-2024, 09:59 AM
Post: #31
RE: Early (earliest?) HP-41C find.
An old thread but I came over another one ...

http://www.hpcalculators.net/hp-41c~1.jpg

1926A00279

Andi
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03-10-2024, 09:34 AM
Post: #32
RE: Early (earliest?) HP-41C find.
(03-09-2024 09:59 AM)AndiGer Wrote:  An old thread but I came over another one ...
1926A00279

Good catch! Unfortunately, the picture of the front does not really help to determine if everything is original. Such an item is still missing in my collection.
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03-10-2024, 10:02 AM
Post: #33
RE: Early (earliest?) HP-41C find.
(03-09-2024 09:59 AM)AndiGer Wrote:  An old thread but I came over another one ...
1926A00279

Looks like this is the one: https://www.hpmuseum.org/cgi-sys/cgiwrap...?read=7364
However, the last three digits are 278. Typo?
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03-10-2024, 11:30 AM
Post: #34
dump of 1901A "DDC" ROM 2C?
Preproduction 1901A units are reported to have used "DDC" mainframe ROMs. Has anyone done a dump of the hitherto unknown ROM2C, or looked at the CPU board to see what the ROM's part number is?

The analysis of the also-rare prototype DDD was quite interesting.
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03-11-2024, 08:24 PM (This post was last modified: 03-11-2024 08:28 PM by hp41cx.)
Post: #35
RE: Early (earliest?) HP-41C find.
1926 A 00255 ROM: ??? - Status: Needs full restoration, is probably a CV with 319 register, Brasil

This information is completely wrong.
This HP-41C belonged to my father.
She is exactly an HP-41C with all the bugs.
She is perfect.
It is working correctly.
it has never been reconditioned.
If you need new photos, just ask.
Just don't ask me to open it.
I'm afraid of damaging the fixation of both parts of it.

Dropbox link

Systems Analyst
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