How a Retrocomputing Enthusiast Got a 30-Year-Old Clamshell Computer Online (youtube.com)
(Sunday December 29, 2024 @10:09PM (EditorDavid)
from the Palmtop-PC dept.)
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 [1]Shayde (who in November [2]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 [3]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 [4]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 [5]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..."
[1] https://www.slashdot.org/~Shayde
[2] https://games.slashdot.org/story/24/11/09/2049218/retrocomputing-enthusiast-repairs-mattels-48-year-old-handheld-videogame
[3] https://www.youtube.com/watch?v=7Ub94fbx7fM
[4] https://biosrhythm.com/?page_id=1453
[5] https://en.wikipedia.org/wiki/HP_48_series#/media/File:HP48GX_Calculator.jpg
But one found its way to long-time Slashdot reader [1]Shayde (who in November [2]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 [3]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 [4]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 [5]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..."
[1] https://www.slashdot.org/~Shayde
[2] https://games.slashdot.org/story/24/11/09/2049218/retrocomputing-enthusiast-repairs-mattels-48-year-old-handheld-videogame
[3] https://www.youtube.com/watch?v=7Ub94fbx7fM
[4] https://biosrhythm.com/?page_id=1453
[5] https://en.wikipedia.org/wiki/HP_48_series#/media/File:HP48GX_Calculator.jpg