Eight Megabytes And we won't have enough room voor Constant Swapping!
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Emacs in bios, that would be a full OS just like splashtop, complete with irc and browsing :P
Also grub 1/legacy can do that. I have old laptops which have no BIOS options to boot from USB, and I have been using legacy grub for years to boot USB sticks. Or are you talking about something else? I suppose in my example, the BIOS has /some/ USB support. Otherwise grub would have to talk to different USB host controllers and do the whole USB transfer at very low level. Surely not even grub 2 is gonna do that?