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 = syslinux =
 * [http://www.gossamer-threads.com/lists/syslinux/users/7127 Continue HD boot option? | syslinux | users]
{{{
from syslinux.doc inside the syslinux package (did you read the doc?) 

LOCALBOOT type [ISOLINUX, PXELINUX] 
On PXELINUX, specifying "LOCALBOOT 0" instead of a "KERNEL" 
option means invoking this particular label will cause a local 
disk boot instead of booting a kernel. 
The argument 0 means perform a normal boot. The argument 4 
will perform a local boot with the Universal Network Driver 
Interface (UNDI) driver still resident in memory. Finally, 
the argument 5 will perform a local boot with the entire PXE 
stack, including the UNDI driver, still resident in memory. 
All other values are undefined. If you don't know what the 
UNDI or PXE stacks are, don't worry -- you don't want them, 
just specify 0. 
On ISOLINUX, the "type" specifies the local drive number to 
boot from; 0x00 is the primary floppy drive and 0x80 is the 
primary hard drive. The special value -1 causes ISOLINUX to 
report failure to the BIOS, which, on recent BIOSes, should 
mean that the next boot device in the boot sequence should be 
activated. 

This labels forks for me on isolinux.cfg : 

label harddisk 
localboot 0x80 
append SLX=0x80 

label floppy 
localboot 0x00 
append SLX=0x00 

except on some weird Compaq BIOSes, Works. 
And the append line I can't remember where it cames from, should work without 
it, I guess some patch for gfxboot that I still using for impress. 
}}}