I've taken this from a dumpster at work. I work in IT and we put old hardware that returned from customers in there for recycling. So I check it regularly for interesting hardware. This is the first time I've found something this old in there. This is the picture a colleague sent me that triggered me to check it out:
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I took the Compaq Deskpro 2000 (Pentium 133, 48MB EDO RAM, 1.6GB HDD) as well. It's working fine after replacing the permanent coin cell with a coin cell holder and a new CR2032. The hard drive still works and has the Compaq diagnostic partition on there as well as a Windows 95 installation. Seems it was last used in around 1999. Last but not least I took the Dell Optiplex GX1 with a Pentium II. It has onboard video and sound but also a PCI video card and an Aureal Vortex sound card in there. I'll check that thing out later.
Back to the 486, so yes it must have definitely been used as an office computer. There were 8 SIMs in there, on that one picture I had taken two of them out to identify. There's 4x Hyundai 1MB and 4x Samsung 1MB so I guess the machine originally came with 4MB and was later upgrade to 8MB. I've cleaned up the battery residue and it came out quite nice. I still have to put some lacquer over the exposed traces.
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The motherboard has an external battery pin header. There was a jumper over pins 2 and 3 which (I assume) connected the onboard battery to the RTC. I've removed that jumper, now it's just a matter of connecting a battery pack to pins 1 and 4? Can someone recommend a battery solution? I've seen a blog were someone wired up a coin cell holder to an internal speaker cable and that worked fine. But 3V is quite low?
Then I cleaned the rest of the board, should be ready to go:
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To be continued!