It had a 4.8-inch display. Introduced in 1991, Hewlett-Packard’s (DOS-based) HP 95LX Palmtop PC — a collaboration with Lotus — was finally discontinued back in 2003.
But one found its way to long-time Slashdot reader Shayde (who in November repaired a 48-year-old handheld videogame console from Mattel). “I really wanted to get this HP95LX talking to the internet at large,” they told Slashdot, ” but network stacks for DOS in 1991 were pretty limited, and this machine didn’t even have the hardware for a network connection.
“It did have a serial port though — a flat 4-pin custom interface. I did a bunch of research and learned how to custom-build an RS-232 hookup for this port, and using an external Wifi module, got it online — and talking to the retrocomputing BBS!”
There’s a video documenting the whole experience. (Along the way he uses 20-gauge hook-up wire from Amazon, a zip tie, solder cups, and an internet modem (the WiFi232 Hayes modem emulator). The whole thing is powered by two AA batteries — it has 512K of memory, and about half a meg of storage. My favorite technical detail?
“Conveniently, the HP 95 [Palmtop PC] uses the exact same pinout as the HP 48GX handheld graphing calculator. So looking up on the Internet, we can determine what pins we need to map from the HP unit over to what would be a DB25 serial port…”
