Posted in retro on Apr 29th, 2025
TL;DR: Original US Robotics I-modem power adapter is extremely rare. I cut mine open to document it. Original adapter provides 20 V AC (1500 mA capacity) across pins 3-4 of mini-DIN connector, no other voltages. Substituting a $15 24 V DC power adapter seems to work just fine. The US Robotics Courier I-Modem seems to […]
Posted in vintage on Apr 16th, 2025
After proving my HST worked in my previous post with an ATX power supply, I went looking for triple-output power adapters (5 VDC, 12 VDC, -12 VDC). I finally found something that works, an ELPAC WM113TT AC-DC power adapter along with a new female DIN 5 connector. There were a few power supply ideas […]
Posted in Uncategorized on Apr 9th, 2025
I picked up a couple of “widebody” USR Courier HST modems and have been working through documenting power adapters for them and sorting out what goes with what. I figured out almost all Courier and HST models have different power supplies and voltage requirements. I’ve been tracking down manuals and cross-referencing the FCC IDs in […]
