Displaying 2 results from an estimated 2 matches for "7c00h".
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7c00
2006 Mar 10
2
unload memdisk+FreeDOS => local boot
...The temporary interface is:
AH = 60h
AL = drive number to boot ... AFTER memdisk is removed
DL = memdisk drive number
int 13h
The restore-and-boot sequence is as follows:
1. validate the checksum on the upper 128 interrupt vectors
2. read the MBR boot sector from the specified device int 0:7C00h
3. restore the lower 128 interrupt vectors
4. restore BIOS_EQUIP and BIOS_HD_COUNT
5. jump to 0:7C00h
Questions
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I chose 60h because Ralf Brown's interrupt list
(http://www.ctyme.com/rbrown.htm) did not indicate that it was being used
for anything else.
I also thought about ove...
2003 Oct 09
0
Copy a chunk to 7C00 transfer execution to it
I want to use ISOLINUX and a COM32 image or a modified
MEMDISK to copy a large chunk into RAM, and move a
portion of this chunk (a COM program) down to 7C00h so
that it can be executed similar to a boot sector.
I've tried this with a COM32 image without much
success, particularly due to my limited knowledge in
Assembly. Any help would be greatly appreciated, but
it would be even better if you can point me to some
code that does this. Thanks in ad...