+- HP Forums (https://www.hpmuseum.org/forum)
+-- Forum: Not HP Calculators (/forum-7.html)
+--- Forum: Not quite HP Calculators - but related (/forum-8.html)
+--- Thread: hardware documentation for HP-30b? (/thread-20144.html)
hardware documentation for HP-30b? - John Ioannidis - 07-03-2023 04:22 PM
Where was the hardware documented? I tried wading through old forum posts, but I could not find anything.
RE: hardware documentation for HP-30b? - brouhaha - 07-04-2023 07:27 AM
(07-03-2023 04:22 PM)John Ioannidis Wrote: Where was the hardware documented? I tried wading through old forum posts, but I could not find anything.
The 20b and 30b are electrically identical, except for one GPIO pin.
There's a developer kit, which contains the schematic, LCD artwork, and sample code (but not the actual 20b source code). Thanks to Eric Rechlin for saving this. I was sure that I had a copy, but couldn't find it.
Richard Nelson wrote a report on 20b hardware interfacing.
[link corrected - thanks Sylvain!]
RE: hardware documentation for HP-30b? - Sylvain Cote - 07-04-2023 09:11 AM
(07-04-2023 07:27 AM)brouhaha Wrote: Richard Nelson wrote a report on 20b hardware interfacing.Link corrected, removed space between url= and https.