Hi,

With /X and /NOABOVE16 there is no gibberish but a hang. The last message
HimemX prints is KBC A20 method used.

btmgr was a pain to install - does not compile on the Debian 8 system which
is the only other system I have with working floppy drive. I did not try to
install the rpm but what worked is running the dos binary from the 486
after copying it over there with a floppy and figuring out the Load error:
no DPMI - get csdpmi*b.zip error I kept getting. I was unable to get it
detect my CDROM drives so far. I will connect them to the primary IDE and
see what happens. I have tried all sorts of CDROM I/O ports settings
without luck for secondary and tertiary IDE.

I have LBA configured in the BIOS for the hard drives, mostly because it
keeps BIOS boot and Windows 98 working. I was unable so far to find a
working combination with different non LBA modes. I will retry sys c: on a
new FAT32 installation.

Cheers,

Dimitris


On Tue, Jul 19, 2016 at 9:10 AM, Eric Auer <e.a...@jpberlin.de> wrote:

>
> Hi Dimitris and others,
>
> as I received some (aggressive) corrections from Jack and Johnson:
>
> Yes of course I can read manuals myself. The XMGR option /T0 means
> 'No "E820h" nor "E801h" requests.' so please try if the two HIMEMX
> options /X (no int 15.e820 requests) and /NOABOVE16 (no int 15.e801
> requests) options make things work even with HIMEMX :-) Remember to
> update both the installer boot config and config on C: afterwards.
>
> My excuses for guessing that A20 issues might be the problem here.
> Jack's implicit suggestion that the BIOS has int 15 bugs is better.
>
> Next topic: I do NOT claim that FDISK /MBR should help you. I only
> replied to the other posting where somebody suggested that. I have
> no opinion about which DOS brands should benefit from updating MBR.
> But I wanted to warn about possible side effects of FDISK /MBR ...
>
> Third topic: 486 often can NOT boot from CD-ROM, but the Smart Boot
> Manager is pretty cool! It can be installed to a boot floppy which
> then helps you to boot from CD-ROM, even without full BIOS support:
>
> http://btmgr.sourceforge.net/about.html
>
>
>
> Now to reply to the other 486 related reactions on the mailing list:
>
> I see that you have not been able to make SBM work on your 486 yet,
> but there could still be some trick to make it work even there :-)
>
> Also interesting that booting failed from FAT32 but not from FAT16:
> It may also make a difference whether you use LBA or non-LBA for the
> partition type. There also is a small chance that DOS and BIOS are
> not agreeing about CHS geometry, although this should not happen. It
> can be an idea to manually use SYS command line options to get boot
> sectors for FAT32-LBA instead of FAT32-CHS or vice versa.
>
> As far as I remember, our FAT16 boot sector auto-selects CHS or LBA.
> As Louis wrote, the default FAT32 boot sector may need LBA and your
> BIOS may be without LBA or with LBA bugs. Try SYS-ing FAT32 to CHS.
>
> Cheers, Eric
>
>
>
>
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