HP 35s Checksum explained

[MarkHaysHarris777]

(02-11-2015 05:16 PM)Thomas Radtke Wrote:  I'd have one if it weren't for those stickers. OTOH I don't need much beyond what my 32SII, which I use at home, can do.

I thought the same thing (really bugged me actually) until I made my own 34s. The overlay actually was easy to install (just follow Eric's video, lay down the middle and let the ends fall away) and it only took me about 20 minutes to put on all the stickers. BUT, the vinyl stickers are a *very* nice quality and the adhesive is superb. Use clean dry hands (no oily finger tips!) And actually, the 34s really looks good too. Yes, if it had double moulded plastic keys from the factory things would be better, but, all in all its very nice; no complaints, really.

Quote:The 35s in my office has the advantage of being capable to store *many* equations and programs, and still can integrate :-). And if it gets stolen it can easily be replaced.

True enough. That's really the reason I purchased the 35s... it has a ton of memory, its easy to program, and its memory management is easy and flexible (not to mention huge).

Quote:HP: Develop a 35SII with open firmware!

Yes. I think the community is going to beat them to it (43s). In my opinion the machine needs to be Armed, have an all-points-addressable lcd which will allow for four lines (stack levels) with annunciators (allowing graphing if desired) comm built in (peer to peer, and pc, 2.5mm i/o and micro usb) rocker click keys (with cursor keys) and NO larger than the HP35s (its boarder line too big). Obviously, it needs to be flash-able. Building a calculator in this age without being able to replace its firmware (should there be quirks, and you know there will be) is just plain dumb engineering; sorry, IMHO.

I have some ideas about the actual hardware design, which I will post after I get organized, to the 43s status page. I'm almost tempted to build my own prototype... I'm getting restless waiting .

Cheers

marcus