6 Apr
2004
6 Apr
'04
7:46 a.m.
The data in these early patents is of immense interest
to anyone interested
in early computer history and I took it upon myself to begin indexing
the computer related patents. My index currently holds 880 listings and
many names familiar to the computer history buff can be found; though many
remain to be discovered.
There is a mass of fascinating documents to browse through. I have seen
patents running to almost 1000 pages (check out patent number 3400371
issued exactly 40 years ago today)
Might I recomend patents 3859635, 3839630, and, I believe 4012725 (I know
this one as the GB patent 1444141).
These are the patents for the HP9810, 9820, and 9830 desktop calculators
and contain more information that you'd find in most service manuals!.
Admittedly production machines have minor differences from the ones
described in the patents, but the schematics and ROM source (!) in the
patents are a great help!
-tony