ISA Computers and ISA motherboards come in various form factors like ATX, Baby AT and Micro ATX. In terms of CPU compatibility, there are just a couple of options for Pentium 4 and the rest are for Pentium III, II and the good old socket 7 Pentium CPUs. They only accept IDE hard drives so companies like Interloper.com keep a decent stock of such older IDE hard drives, CD-ROM drives, network cards, ISA video cards and even ISA modems. Yes some applications still require ISA modems. Hard to believe but it's true.
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