[syslinux] Problem with FreeDOS + himem64 + PXELINUX + memdisk

H. Peter Anvin hpa at zytor.com
Mon Jan 26 19:56:50 PST 2004


Patrick J. LoPresti wrote:
> 
> Eric Auer, a FreeDOS developer, commented:
> 
>     Note that MEMDISK access might fail while A20 is off - the handler
>     itself is in 40:[13] allocated low memory, but the disk itself is
>     in int 15 high memory as far as I remember. You should check the
>     MEMDISK sources to see how disk data is accessed and what is done
>     for the A20.
> 
> Unfortunately, I do not know enough x86 assembly to understand the
> memdisk sources.
> 

MEMDISK uses the INT 15h AH=87h mover function, using 386-style selectors.

	-hpa




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