There isn't a "universal" standard when it come to PS2 to USB Adapters..
I think what Steve means is there is no standard "type" or format these adapters come in, because there certainly are universal standards in play here - at least when it comes to the pin-assignments, connector types, voltages, etc. Where the problem(?) is is determining what type of adapter you need. There are simply adapters - like this
, of which I have a dozen or so laying around as they used to come with many new USB mice and keyboards. And there are adapter cables, like this
that allows you to connect both a PS/2 keyboard and PS/2 mouse to a USB port. There are also single cables, for just a mouse or a keyboard - and they come in many lengths.
Or, you can even simply add PS/2 support to any PC with a spare PCI
slot (NOT to be confused with PCIe) using a PCI
to PS/2 adapter card
Find an old geek in your neighborhood or work. It is likely he or she has a few of the little adapters laying around in their junk drawers they will just give you. Or next time you are in Eastern Nebraska, stop on by!
BTW, long ago and far away - way before Gateway was cheapened with the merger with eMachines, and cheapened further when it was later bought-out by Acer, Gateway made (or rebranded) some excellent keyboards. They had a "tactile" feel and reassuring click that rivaled the best Northgate Omni and IBM Model M keyboards.
My old Gateway AT tower is long gutted (and turned into a side table!), but the keyboard lives on (even if it does not have a Windows key!).