I have slightly modified smart boot manager 3.7-1 to work as a comboot file
with syslinux.  Once added to syslinux menu, one can boot to syslinux and
chain boot sbm, which can then boot a CD-ROM :-) and use 
Bart's el-torrito CD-ROM driver.  I use SBM on my 486 (which lacks
el-torrito support in its BIOS) to boot the FreeDOS CD-ROM for testing.  
(Or have some fun flopping back and forth between syslinux->memdisk->sbm->sylinux->... 

FYI, SMB is boot disk manager that normally occupies a few
sectors on the harddisk or floppy and has its own loader.  Normally
one uses sbminst to create a special boot floppy (it does not have
a FAT filesystem and is not recognized by DOS/Windows) which 
simply contains the 512byte loader and the 23KB program in the 1st few
sectors of the disk.  The advantages of SBM is that is can boot
the computer from devices not supported by its BIOS (such as
booting from a CD-ROM drive on older computers or one's with
bad support).

I have disabled the save changes support, though it may be possible
to use the SYSLINUX API to reenable this (open/read/save).  I have
only tested some of the basic booting (floppy, back to BIOS [back to
SYSLINUX], second floppy, CD-ROM, ...) and they all work on my
test computer.  As always, use at your own risk.  I have not tested
the install SBM feature, it may or may not work.  Backup 1st.



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