Reply 20 of 39, by jade_angel
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So, I just googled your part number. It's not a JX30GC, it's a JX30G. Partial manual here: http://webpages.charter.net/dperr/micronics/900189.htm. Salient differences appear to be: GC version has dual IDE, this seems to have single; GC version also supports 3.3v CPUs (but not multiplier select; a 5x86/133 will run at 3x33, not the correct 4x33). So, DX2 is the limit unless you can find a DX4 Overdrive, Pentium OD or 5x86 with voltage regulator. Otherwise they're very, very similar boards.
Might have the same issues as the JX30GC, though. Mine wouldn't recognize a SATA DVD+RW connected with one of those adapters; I didn't try a hard drive that way.
Consider my hat smoked, but only partway!
EDIT: If you were to add one of these - http://www.ebay.com/itm/AMD-AM486-DX4-100-WIT … B0AAOSw9GhYl2xP, (not my sale) then socket a 5x86/133 with integrated voltage regulator onto that, I suppose you could get it working at full speed. Weird!
Main Box: Macbook Pro M2 Max
Alas, I'm down to emulation.