When Valve announced SteamOS, quite a lot of users were disappointed as the OS images were available only for UEFI systems leaving out those users who had legacy BIOS based systems. Now those users can try Steam OS. There is a caveat, though.
Since the images are at beta stage and developers admit that very little testing was done on those images so it’s not recommended for dual booting systems. At the same time beware of testing it on a machine which has critical data on it as you might lose that data, so I heavily recommend to try it on a test machine and disconnect additional hard drives which may had important data on them.
I just posted a SteamOS ISO that can be used to install SteamOS on non-UEFI systems. Thanks to directhex and ecliptik for their work on Ye Olde SteamOSe – this incorporates many of their changes. Dual-boot and custom partitioning are now possible from the “Expert Install” option.
PLEASE note there has been very little testing on this, especially any kind of dual-boot setup. So don’t install it on any machine you are not prepared to lose.
If you have any problems, please post on this discussion or open an issue on the SteamOS github.
In addition the company also updated both the alchemist and alchemist_beta releases recently. The update fixed audio output on the Intel Gigabyte machines that were given out at Steam Dev Days.