Re: Not able to boot from SCSI disk on SYM21002 but all other works

Manfred Preussig wrote:

Starting from here all have to be new-interpreted. I have got from some
friend another hba: SYM22801, which is two-channel too, which is 16 bit
too and which bases on the 53C875 chip from Symbios Logic. Of course
this could work before in another system but here it looks like the
same. So it have to be another problem.

As I boot from floppy (which works fine) with a suddenly found old
MS-DOS 6.2 boot disk I found out another thing: the system even don't
know anything concerning the SCSI system. As I wrote C: (which would
change the so-called active drive from the A: from boot to the first
MS-DOS-partition to be found) nothing happens ... not correct, an error
occurs. There is no C: at all. Of course the windows XP C: is not for
DOS since it is with FAT32 formatted (not NTFS since up to some months
ago Linux can't use NTFS completely) and DOS don't know anything about
FAT32. But I have some other partitions (partly historical reasons but I
use for some real old hardware like an eprom writer a DOS installation
on the disk too) and some of them are FAT formatted (the older one). Of
course there are some longer filenames on them but this don't blocks DOS
from using this drive -that's only true for FAT32, not FAT16 with V-FAT
(the longer names system). So if any of the drives in the SCSI system
could be found this would be enabled as C: and up. If there is no C:
there is no drive at all -and this is astonishing.


What's so astonishing? You are booting from MS DOS 6.2 on floppy. MS DOS
does not provide any native SCSI support. If you aren't loading DOS
drivers from that boot disk you have no access to SCSI devices. If you
aren't loading a SCSI BIOS - and apparently you aren't on this system -
you have no access to SCSI devices.

Rick
.

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