These links are taken from several sources (mainly hpmuseum.org) and our own experience
HP Calculators and Computers
- HPCalc.org - Eric Rechlin's website
- Valentin Albillo's pages on hpcalc.org
- Eric Smith's HP Calculator Page Simulators and Technical literature.
- HPCC Handheld And Portable Computer Club
- the biggest HP museum - in Australia!
- Namir Shammas monumental mathematical programs site
- Classic Calculators - Epocalc's Site
HP48/38
- The HP48 Goodies Page by Joe Horn
- hpcalc Eric Rechlin's HP-48, 38 and 28 site.
- A lot of programs in Spanish for the HP 48 in Luis Gallardo's page
Other Calculating and Scientific Instruments
- Old Calculators Pages by Rick Bensene
- Disassembling a Curta Calculator by Greg A. Saville
- Old HP and TI Calculators by Gene Wright
- Otis King's patent calculators by Dick Lyon
- The Analytical Engine by John Walker
- Rskey.org by Viktor Toth
Old Computers
- Paul Pierce's Computer Collection Micros to vacuum tube mainframes.
- The Charles Babbage Institute Center for the History of Information Processing
- Timeline of Microcomputers Ken Polsson
- The Digital Equipment Corporation PDP-8 by Doug Jones
- ENIAC-on-a-Chip (Someone had to do it.)
- Vintage calculators - a lot of links