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Different ROM versions HP80?
11-12-2016, 01:59 PM
Post: #1
Different ROM versions HP80?
When playing with Tonys emulator I found it behaves differently than my real HP80.
I get slighty different results from some calculations, but the most obvious and very easy to reproduce thing is: Turn on the calculator, press divide, which of course results in an error. Pressing Enter now puts a 10 in the x register. My real HP80 has 9.999999999 e99 in the X register.

Cheers,
Harald
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11-12-2016, 04:52 PM
Post: #2
RE: Different ROM versions HP80?
Ok,

Here :

1247A 05142 and 1247A 46954 both put a 10 in the x register.

I'll try to get a hand on my Singapores and report.

Cheers

Etienne
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11-12-2016, 11:14 PM
Post: #3
RE: Different ROM versions HP80?
(11-12-2016 04:52 PM)Etienne Victoria Wrote:  Ok,

Here :

1247A 05142 and 1247A 46954 both put a 10 in the x register.

I'll try to get a hand on my Singapores and report.

Cheers

Etienne

Hi Etienne!

Your Calculator has arrived today, thanks a lot!
It is without battery terminals and I need to work out why the decimal points are not working. Also I will replace one LED cluster due to a bad Segment. But I have all the parts to do this, so please keep your other calculators. You will need one to put the PCB in once I send it to you.

However I tested this one and it behaves exactly like the one I already have. Both are the newer version with the 2 ROM chips. So I guess the version with the hybrid is not only physically different, but also the contents is different

Cheers,
Harald
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11-13-2016, 06:19 PM
Post: #4
RE: Different ROM versions HP80?
Hi Harald,

Glad you got the 80 and can actually make good use of it :-)

Yes, the ROM content must be different ; maybe they had the opportunity to update it when changing design and production site.

From the samples I have, the 1247A are on the left and the 1704S on the right of the pictures.

[Image: image-4.jpg]
[Image: image-5.jpg]

And the board underwent a couple of changes:

1247A:

[Image: image-11.jpg]
[Image: image-10.jpg]

1704S:
[Image: image-2.jpg]
[Image: image-9.jpg]

Cheers

Etienne
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