> >> > -dc820:0 2 > >> It reads FF FF FF > > ok. that'll be the unmapped space then. It looks like Lucho is right > > and you have a tiny 512 byte sized signature "EPROM" at c800:0000. > > That'll be easy to fix. > > But it's very strange to have such a tiny piece of uncompressed ROM! > Erwin, please test more bytes from C820:0 than just 3 bytes. It's > possible that the ROM module there has "holes". It's also possible > that it reports just its first 512 bytes as its size but its *actual* > size is much larger. Finally, it's (at least theoretically) possible > that all the first 512 bytes are all ones (FF) and the REAL code > starts after them, to avoid having to update the checksum after a > change (completely violating the purpose of the ROM scan which should > check this checksum ;-)
I ran "-dC000:0 FFFF" to get some overview here: C000-C7FF looks to be my 32k Video bios (starts with 55 AA 40, shows string "VGA Coompatible BIOS") C800-C81F indeed has something to do with the extra UDMA (starts with 55 AA 01, shows string "HIGHPOINT", no FF's) C820-CFFF is empty (all FF) So could it be that the HIGHPOINT UDMA jumps to somewhere else for its payload ? Erwin -- Erwin Veermans <[EMAIL PROTECTED]> Psychiatry RuG, PO Box 30001, 9700 RB Groningen, Netherlands ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click _______________________________________________ Freedos-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/freedos-devel
