31 Dec
2009
31 Dec
'09
6:43 p.m.
US4639863 and US4819153
The interesting thing about them is they include the full schematics
I am sure most people here know that some of the early HP calculator/computer
patents include scheamtics (not always quite the same as the production
models, but very useful), and slo commented ROM source listings (and
sometimes listings of add-on ROMs, etc)
Since the patents rarely mention the name the product was sold under,
somebody (not me!) should run a database for products and (useful)
patents.
-tony