Hewlett-Packard HP 48SX Scientific Expandable Handheld Electronic Calculator | National Museum of American History
Category:HP-48 - Wikimedia Commons
HP 48SX
File:Hewlett Packard Model HP 48SX Scientific Expandable Electronic Pocket Calculator, Made In Singapore, Available 1990 - 1993 (21761270898).jpg - Wikimedia Commons
HP48SX Owner Manual Vol 1 | PDF | Hewlett Packard | Computing And Information Technology
HP-48 Kermit Hints and Tips
Hardware Design of the HP 48SX Scientific Expandable Calculator