Reply 26980 of 56709, by SpectriaForce
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wrote:Received my 'mystery box' I bought based on nothing more than the description "Shitec 486SX with CPU and VGA missing". This was […]
Received my 'mystery box' I bought based on nothing more than the description "Shitec 486SX with CPU and VGA missing". This was an exercise in "how not to ship stuff" - the case was dumped loose in a large box it could (and did) bounce around in. To make matters worse the top wasn't even screwed on so came loose in the box and one corner ended up very badly bent. To add insult to injury the postman left it outside in the rain yesterday.
Fortunately it is incredibly well-build and I could bend back the thick steel top so it at least fit again. This was the result:
Not a minitower as I sort of expected, but an LPX desktop. At first sight no sign of a CPU so I stuck in a Trident VGA card and a 486DX and after setting a few documented jumpers and a lucky guess on an unldocumented one, it worked! Then I disassembled everything to clean it and saw this:
Yep, a big soldered i486SX-25 that had been hiding under the drive bay. I've since removed the DX and set the jumpers back (that undocumented JP6 turns out to select onboard vs socketed CPU). Pretty remarkable board with 12 30p SIMM slots - which were all filled with 1MB parity SIMMs - 128kB of cache and a "Vtech" chipset. Also no identifying features other than that "702496C". Now, googling that doesn't find me anything, but that "496C" sounds suspiciously like a SiS chipset name, so I sort of suspect this is a Vtech board with relabeled SiS chipset. Given that everything works, I'm not hugely worried about not having documentation, but it would be nice to know what all those jumpers around the Winbond I/O section do...
Your pc looks very similar to this one: download/file.php?id=57684&mode=view Nice find.