50g or 49g+?

[burkhard]

(05-03-2018 03:33 PM)Paul Berger (Canada) Wrote:  

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

Perfect, Paul. So your original list of just those three was in fact already comprehensive! That's really helpful. I'll need to look a little more into the procedure to open them up and do the swap.

most appreciatively.
burkhard