An anonymous reader writes "I have some older computer equipment at work that I want to re-purpose as application appliances. The machines will sit, unpowered, until needed, then powered up. No way around the 'sitting powered off' — company directive. What is the quickest-booting OS I could use for them? I know about LinuxBIOS, but that would require new hardware, which does not go along which the re-purposing theme. Some of them do not need to be connected to a network, so an old version of Linux or Windows 98 are possible. DOS is too old to consider. So what are my options?"