Groups > comp.os.msdos.programmer > #193

Re: Floppy based FreeDOS

From	Single Stage to Orbit <alex.buell@munted.org.uk>
Newsgroups	comp.os.msdos.programmer
Subject	Re: Floppy based FreeDOS
Date	2011-09-04 09:01 +0100
Organization	One very high maintenance cat
Message-ID	<0rnbj8-tdc.ln1@nntp.local.net> (permalink)
References	<853384dd-5b93-46d5-9a05-a95fe856e045@r8g2000prd.googlegroups.com> <970663ed-2ab2-47f5-89f9-be0d95cd12c8@b10g2000vbz.googlegroups.com> <600db7ae-4aa0-4b30-95b0-0684fd0ccb29@e34g2000prn.googlegroups.com>

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On Sat, 2011-09-03 at 22:43 -0700, monahanz wrote:
> As I said above I am writing a custom BIOS for my S-100/8086 system
> such that all BIOS INT calls respond as MS-DOS expects them to run the
> system. I have it up to MS-DOS V4.01 with 5' & 3" floppies.  However I
> can not get the IN13H calls to work with the IDE Hard disk. (I can do
> sector R/W calls with DEBUG etc form floppies), but somehow the BOOT
> does not recognize the HDisk.  I even put in the PC-AT BIOS cassette
> "extensions"! 

IIRC, IBM BIOS doesn't do hard disks. Rather, on the IBM PC, the BIOS
calls into the ROM that was provided with the hard disk interface. I
think you might need to write a hard disk ROM to go with your custom
BIOS. There's nothing to stop you from combining a hard disk BIOS with
your custom BIOS though as long as it detects the presence of it. 
-- 
Tactical Nuclear Kittens

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Floppy based FreeDOS monahanz <monahan@vitasoft.org> - 2011-09-03 10:41 -0700
  Re: Floppy based FreeDOS Rugxulo <rugxulo@gmail.com> - 2011-09-03 11:55 -0700
    Re: Floppy based FreeDOS monahanz <monahan@vitasoft.org> - 2011-09-03 22:43 -0700
      Re: Floppy based FreeDOS Single Stage to Orbit <alex.buell@munted.org.uk> - 2011-09-04 09:01 +0100
        Re: Floppy based FreeDOS Ross Ridge <rridge@csclub.uwaterloo.ca> - 2011-09-04 10:00 -0400
      Re: Floppy based FreeDOS Rugxulo <rugxulo@gmail.com> - 2011-09-04 08:53 -0700
        Re: Floppy based FreeDOS monahanz <monahan@vitasoft.org> - 2011-09-04 10:06 -0700
          Re: Floppy based FreeDOS monahanz <monahan@vitasoft.org> - 2011-09-04 12:44 -0700
          Re: Floppy based FreeDOS Rugxulo <rugxulo@gmail.com> - 2011-09-04 13:08 -0700
            Re: Floppy based FreeDOS monahanz <monahan@vitasoft.org> - 2011-09-04 14:53 -0700
              Re: Floppy based FreeDOS Jim Leonard <mobygamer@gmail.com> - 2011-09-06 09:54 -0700
                Re: Floppy based FreeDOS Jim Leonard <mobygamer@gmail.com> - 2011-09-07 12:08 -0700
            Re: Floppy based FreeDOS "Rod Pemberton" <do_not_have@noavailemail.cmm> - 2011-09-05 02:10 -0400

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