Dual Group was a Taiwanese OEM that manufactured a lot of PC peripherals in the 1980s. They had a US office in Torrance, CA.
(from PC Mag)
According to this snippet they were founded in 1982:
I couldn't find any information about the DC-4000 in particular besides the FCC ID but there's some...
This is not so much a request for advice but rather documenting the innards of a not-so-common part for a Compaq Portable 286. It's the Sprague line filter unit (JN17-5259E) which houses the Class X and Y capacitors as well as the mains power connector, fuse and switch.
When I first powered...
Huzzah! Yep, triangles should overlap, thanks for confirming!
Huh, I didn't even know there was a hard drive in this thing. I wonder why they would keep that but not the processor and keyboard.
Can anyone verify the correct orientation of the processor board for the Zenith Z-Star notebook? I bought mine for super cheap at a swap meet, but it was missing the processor board and keyboard for some odd reason. I bought the unobtanium parts off eBay, and they just arrived, but I'm not sure...