50g or 49g+?

[Paul Berger (Canada)]

(05-03-2018 03:24 PM)burkhard Wrote:  

(01-20-2018 01:38 AM)Paul Berger (Canada) Wrote:  The 39G, 40G, and 49G are not completely useless they make great donors of black screens to put into 48S and G models.

I'm going a bit off-topic, but this quote from Paul caught my attention. I was aware that "some" of the less desirable newer models use identical black 131×64 screens to the later HP48's and as such, they can drop (perhaps with more effort than this implies) into a 48 to give it the higher contrast screen.

There are a *bunch* of HP39, 40, and 49 variants though. Which can be donors?
39G: Yes (per Paul, above)
40G: Yes (per Paul, above)
39g+: Yes? This seems to have a 131×64 screen.
39gs: Yes? This seems to have a 131×64 screen.
40gs: Yes? This seems to have a 131×64 screen.
39gII: I think NO, because it uses a different hi-res 256×128 grey scale screen
49G: Yes (per Paul, above)
49g+: I think NO, because it has a larger 131×80 screen.
48gII: Yes? This seems to have a 131×64 screen.
50g: I think NO, because it has a larger 131×80 screen.
Did I miss any?

Some of these are obviously more expensive than others and thus obviously wouldn't make good donor candidates, but I wanted to make a comprehensive list of the 39/40/49/50 models.

Please let me know if my YES/NO assumptions are correct.

Thanks,
burkhard

The 39G+, 39GS, 40GS, 48GII are not suitable as while they may have the same display size, they use a different technology to connect the display. The 39G, 40G, and 49G use elastomer connectors like the 48S and G, the newer calculator use a ribbon cable that is bonded to the display and circuit board to connect the glass to the electronics.

Paul.