Die shots of all integrated circuits of an Hp41c

[Kees Bouw]

(03-21-2018 09:15 PM)pablowalls Wrote:  I have an Hp67 with a bad ACT chip and I will try to decap and hope this time I get it right.

Hi Pablo,

If the empty case of this HP-67 is still in good shape, would you be interested in selling that to me?

Kees.

[cruff]

All I see are things like [Image: aaaaa.jpg], but not as a clickable link, but if I use the context menu I can see it when I select View Image.

[rprosperi]

(03-22-2018 12:03 AM)cruff Wrote:  All I see are things like [Image: aaaaa.jpg], but not as a clickable link, but if I use the context menu I can see it when I select View Image.

Here is the link for the 1st photo:

https://pbs.twimg.com/media/DYQF5xNUMAAKm5x.jpg

If you use that link directly, can you see it?

[pablowalls]

This is the die shot of the ACT chip from a Hp25, the decaping of the chip went wrong and I almost destroy the die.

[Martin Hepperle]

... so you now officially qualify as a circuit breaker ...

[cruff]

(03-22-2018 12:27 AM)rprosperi Wrote:  Here is the link for the 1st photo:

https://pbs.twimg.com/media/DYQF5xNUMAAKm5x.jpg

If you use that link directly, can you see it?

Yes, that works directly and it appears in the text in the color for a link. Not sure why my Firefox isn't rendering the other links in this thread that way.

[rprosperi]

(03-23-2018 11:44 AM)cruff Wrote:  Yes, that works directly and it appears in the text in the color for a link. Not sure why my Firefox isn't rendering the other links in this thread that way.

That is strange. Not sure why FF would not display them? Do you have any aggressive security settings enabled?

[paul0207]

The links will work in Firefox by disabling "Tracking Protection".

Paul

(03-23-2018 11:44 AM)cruff Wrote:  

(03-22-2018 12:27 AM)rprosperi Wrote:  Here is the link for the 1st photo:

https://pbs.twimg.com/media/DYQF5xNUMAAKm5x.jpg

If you use that link directly, can you see it?

Yes, that works directly and it appears in the text in the color for a link. Not sure why my Firefox isn't rendering the other links in this thread that way.

[Chris Dreher]

Cool shots! What technique did you use to decap the chips? I am considering a decap project for some non-calculator parts.

[pablowalls]

(03-24-2018 03:46 AM)Chris Dreher Wrote:  Cool shots! What technique did you use to decap the chips? I am considering a decap project for some non-calculator parts.

Chris, I burn the chip with a torch and remove the ashes carefully until the die is exposed, I then clean the die with Isopropanol and then I rub the die over a hard cardboard with some drops of Brasso metal cleaner and that's all. I hope you find this information useful.

Pablo Walls