Path: utzoo!mnetor!uunet!husc6!mit-eddie!uw-beaver!cornell!batcomputer!braner From: braner@batcomputer.tn.cornell.edu (braner) Newsgroups: comp.sys.atari.st Subject: Re: SH204 and MS-DOS Message-ID: <3642@batcomputer.tn.cornell.edu> Date: 7 Feb 88 00:28:44 GMT References: <3444@batcomputer.tn.cornell.edu> <617@cernvax.UUCP> Reply-To: braner@tcgould.tn.cornell.edu (braner) Organization: Cornell Theory Center, Cornell University, Ithaca NY Lines: 37 Summary: the locations to patch In article <617@cernvax.UUCP> jmg@cernvax.UUCP () writes: >In article <3444@batcomputer.tn.cornell.edu> braner@tcgould.tn.cornell.edu (braner) writes: >>I got hold of the fix from Avante Guarde to make MS-DOS correctly read >>the Atari SH204 hard disk under PC-Ditto. Turns out that the boot >>parameters in the HD are trashed after running the Atari utilities. >>Here are correct values of the trashed parameters in logical sector 0 >>of each HD partition: (the trashy ones sure looked suspicious!) OK, here it is again, with the offsets into the boot sectors (which are logical sector 0 of each partition, NOT the first sector of the physical disk, which holds the partition info and autobooting code). (Mr. Pratt at Atari told me that the BIOS function Rwabs() with r/w parameter of 0 reads the logical sectors of the partitions, but with r/w = 2 and record number = 0 one can read the master boot sector.) offset bytes correct trash 10 1 NFATS 02 20 15 1 MEDIA F8 73 18 2 SPT 0011 2E70 1A 2 NSIDES 0004 2C73 1C 2 NHID 0001 2076 (all in hex). Note that the 2-byte entries are in INTEL format, i.e. low-order byte first! (That's for MD-DOS compatibility.) I also put F8 in the first sector of each copy of the FAT in each partition, just in case (the fix program from A.G. does not do that). They say you must fix it again after EACH TIME you run HDX or HINSTALL. >... However, PCDITTO >fails to recognise that I have any hard disk at all, whatever I try. You need PCD version 3.0. - Moshe Braner PS: PCD still does not recognize my 5.25 inch drive B: !!!