Different ROM versions HP80?

[Harald]

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

[Etienne Victoria]

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

[Harald]

(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

[Etienne Victoria]

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.




And the board underwent a couple of changes:

1247A:




1704S:



Cheers

Etienne