Small Footprint PCs?
Gameface asks: "I am looking for the smallest system I can find, in quantity, for my company. We need thousands of these systems, and I'd like to ask the Slashdot community what they'd recommend. Looking for the tiniest footprint for: Case, Motherboard, CPU, RAM, HDD, Serial Port, (2) 10/100 ports. No video required, no sound, all access will be via console (serial port). No OS, just a bare piece of hardware that I can load the OS onto the HDD. I'd really like to find something with SIMMS so we can upgrade the RAM if we need to. And of course, price is very much an issue. Thanks."
I think that will determine your search more than absolute size. Afterall, you could get a webserver the size of a matchbox, but it'd be pretty lousy as a user workstation... If you want really dense servers, check into the "blade" fad. If you want really tiny user workstations, look into Shuttle's line of small and quiet most-everything-is-integrated barebones PCs (they've got pci slots for that extra nic or whatever). And of course there are all kinds of tiny single board computers for industrial applications.
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I think you'd be hard-pressed to find a modern machine that uses SIMMs. And I think you'd be hard-pressed to find a 486 with 2 10/100 ethernet ports on-board as well.
Do you have any idea what you are really looking for?