🚀 go-pugleaf

> From:    padgett@tccslr.dnet.mmc.com (A. Padgett Peterson)

> ps It is my understanding (David ?) that OS/2 uses selection through a
>    replacement of the DBR (OBR ?) *not* the MBR and requires a more complex
>    approach...

There are two multi-boot arrangements available with OS/2.  One
(called "Dual Boot") works about as you say: when you boot the
machine, it comes up under whatever OS you last had.  If you want the
other one, you use the BOOT command, which swaps OSBRs (not the MBR)
and reboots.  The other one is Boot Manager, which sits in the
bootable partition on the disk, gets control from the (normal) MBR,
puts up a menu asking what OS you want to boot, and when you answer it
loads and executes the corresponding OSBR.  Neither of them does
anything to the MBR when you change OS's, that I'm aware of.  Note
that I'm anything but an Official IBM Spokeshacker on this subject,
though.  I just have a messing-about knowledge of it.

- - -- -
David M. Chess                                          mI' jIHbe' jay'!
High Integrity Computing Lab                            loD tlhab jIH!
IBM Watson Research                                          -- qama''e'