HP Forums
HP 35 with 2.02 bug - Printable Version

+- HP Forums (https://www.hpmuseum.org/forum)
+-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html)
+--- Forum: General Forum (/forum-4.html)
+--- Thread: HP 35 with 2.02 bug (/thread-7164.html)

HP 35 with 2.02 bug - Harald - 11-03-2016 07:28 PM

I have just bought an HP35 with the 2.02 bug. I haven't opened it yet, but will do so soon. Partly out of curiosity and partly because the on off switch needs lubricating. It has a reproduction label so its not too bad a thing to do. Although the reproduction label probably won't survive the procedure as well as the originals do.

Anyhow, what I was going to ask:
What else has changed with the new rom version that fixes the bug? One thing I noticed and would concider another bug is that when entering a negative exponent, chs HAS to be pressed before entering the exponent.
Is the rom code available somwhere? Id like to play with it un Tonys emulator.

Cheers,
Harald

RE: HP 35 with 2.02 bug - Didier Lachieze - 11-03-2016 08:05 PM

For the early rom, have a look here.
Btw, how do you know that the back label is a reproduction ?

RE: HP 35 with 2.02 bug - rprosperi - 11-03-2016 09:02 PM

(11-03-2016 08:05 PM)Didier Lachieze Wrote:  For the early rom, have a look here.
Btw, how do you know that the back label is a reproduction ?

The reproduction labels do not say "Made in USA" at the bottom; at least this is the case for other classic series labels, not 100% sure about early 35s. I'm not sure if this was a dumb mistake, or perhaps they really are not made in the USA, and including that phrase on it would bring about a liability?

RE: HP 35 with 2.02 bug - Harald - 11-03-2016 09:51 PM

Thanks for the link Didier, the ROM code works in Tonys emulator without modification!

As Bob says, the reproduction label does not have the "made in USA" on it. Removing the label proved to be both easier than I thought and unnecessary. I should have checked if the screws under the label are installed... They were not...

Here is a picture of the PCB:
[Image: 35v27tsre.jpg]

RE: HP 35 with 2.02 bug - aurelio - 11-03-2016 10:13 PM

Thank-you Harald for sharing pics of you calculator's internal Smile

searching on the web about replica labels I found this long thread on the old Forum that I never read before and I'm pretty sure it could be interesting although...I've not yet finished to read it interely..... Smile

EDIT: typos

RE: HP 35 with 2.02 bug - Gerson W. Barbosa - 11-03-2016 10:36 PM

(11-03-2016 09:51 PM)Harald Wrote:  Here is a picture of the PCB:

I have one spare board. WITHOUT the bug, IIRC:

[Image: 30129384294_ff8b47e3c6_b.jpg]

RE: HP 35 with 2.02 bug - Didier Lachieze - 11-03-2016 10:45 PM

(11-03-2016 09:51 PM)Harald Wrote:  Thanks for the link Didier, the ROM code works in Tonys emulator without modification!
Great ! I was not sure it would work as is.

(11-03-2016 09:51 PM)Harald Wrote:  As Bob says, the reproduction label does not have the "made in USA" on it. Removing the label proved to be both easier than I thought and unnecessary. I should have checked if the screws under the label are installed... They were not...
Well, if we are talking about the instruction label on the back, not the small label between the two lower feet, then on the early HP 35 units at least there was no "made in USA" as you can see on the picture of a red dot back label in the June-1972 HP Journal page 4. So this could not be the only criteria to identify a reproduction label.

Btw what is the serial number of your unit ?

RE: HP 35 with 2.02 bug - Harald - 11-03-2016 11:14 PM

Here is the link to the auction.
It contains the serial number as well.

I wasn't aware the early back labels didn't have the made in USA on them. I assumed it was a reproduction label and still am pretty sure it is after having seen it. It has a more mate finish then the original and the print quality does not seem to be quite as good.

RE: HP 35 with 2.02 bug - rprosperi - 11-04-2016 01:51 AM

(11-03-2016 10:45 PM)Didier Lachieze Wrote:  Well, if we are talking about the instruction label on the back, not the small label between the two lower feet, then on the early HP 35 units at least there was no "made in USA" as you can see on the picture of a red dot back label in the June-1972 HP Journal page 4. So this could not be the only criteria to identify a reproduction label.

My bad! That comment applies for 65 & 67 labels, where "Made in USA" is centered at the bottom on original labels, but clearly not on 35 labels as there just aint no room.

RE: HP 35 with 2.02 bug - Harald - 11-04-2016 12:09 PM

(11-04-2016 01:51 AM)rprosperi Wrote:  
(11-03-2016 10:45 PM)Didier Lachieze Wrote:  Well, if we are talking about the instruction label on the back, not the small label between the two lower feet, then on the early HP 35 units at least there was no "made in USA" as you can see on the picture of a red dot back label in the June-1972 HP Journal page 4. So this could not be the only criteria to identify a reproduction label.

My bad! That comment applies for 65 & 67 labels, where "Made in USA" is centered at the bottom on original labels, but clearly not on 35 labels as there just aint no room.

The later 35 and 45 labels definatively have a "made in USA" or "made in Singapoor" on them. Have a look at these pictures:

[Image: 35bk.jpg]

[Image: 45bk.jpg]

RE: HP 35 with 2.02 bug - rprosperi - 11-04-2016 02:01 PM

(11-04-2016 12:09 PM)Harald Wrote:  The later 35 and 45 labels definatively have a "made in USA" or "made in Singapoor" on them.

Ahhhh, so then my "my bad", was bad. Does that make it good? Smile

Thanks for posting these Harald; together with the very early one Didier posted I imagine it documents all 3 types of HP-35 labels?

FYI: Current replacement labels (I believe different from those discussed in the thread referenced above) can be seen here.

RE: HP 35 with 2.02 bug - teenix - 11-05-2016 12:19 AM

(11-03-2016 08:05 PM)Didier Lachieze Wrote:  For the early rom, have a look here.

I added this bug rom version to the emulator. When HP35 is selected you get an option to play with the newer microcode or the 2.02 bug version

cheers

Tony

RE: HP 35 with 2.02 bug - Harald - 11-05-2016 11:06 AM

(11-05-2016 12:19 AM)teenix Wrote:  
(11-03-2016 08:05 PM)Didier Lachieze Wrote:  For the early rom, have a look here.

I added this bug rom version to the emulator. When HP35 is selected you get an option to play with the newer microcode or the 2.02 bug version

cheers

Tony

Thanks Tony!