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Groups > comp.lang.forth > #19670

Re: FORTH for brute force test available? ??? ;/

From "Rod Pemberton" <do_not_have@notemailnotz.cnm>
Newsgroups comp.lang.forth
Subject Re: FORTH for brute force test available? ??? ;/
Date 2013-02-12 08:43 -0500
Organization Aioe.org NNTP Server
Message-ID <kfdgs4$qbp$1@speranza.aioe.org> (permalink)
References <vI-dncAjquwIjIXMnZ2dnUVZ_s2dnZ2d@supernews.com> <kf9dph$kii$1@speranza.aioe.org> <3N-dnQ92c_hGjoTMnZ2dnUVZ_uSdnZ2d@supernews.com>

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"Richard Owlett" <rowlett@pcnetinc.com> wrote in message
news:3N-dnQ92c_hGjoTMnZ2dnUVZ_uSdnZ2d@supernews.com...
...

> If I was writing FROM SCRATCH what I envision, it would
> likely be to no more than a dozen BIOS routines and some
> loop counters.

Ok.

> It would write 0x5A from first byte of first sector thru the
> last BIOS accesible sector.

For large, modern drives, the last BIOS accessible sector is far
less than "*ALL* sectors".  Direct programming of the drive is
necessary.  However, your laptops probably don't have such large
drives.

> Both my laptops can boot from USB flash drives, therefore
> the ability to access one must already be present.
>

Yes, but, my understanding is that this implemented in hardware,
not software.  It's called "legacy emulation".  The hardware
emulates the boot device as an IDE drive.  Even if it was
implemented in software, there are no BIOS routines for accessing
or using this extra functionality.  Only the booted from device is
emulated, i.e., you can use BIOS disk routines - with their size
limitations - to access the booted from device.  If you boot from
CDROM, then your "environment" will need driver code for accessing
USB devices.  There is no BIOS support for accessing USB.  If you
boot from USB, then your "environment" will need driver code for
accessing CDROMs.  If you boot from USB, then you'll be erasing
your boot "environment".  That's why I recommended a full featured
OS.


Rod Pemberton

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Thread

FORTH for brute force test available? ??? ;/ Richard Owlett <rowlett@pcnetinc.com> - 2013-02-10 15:30 -0600
  Re: FORTH for brute force test available? ??? ;/ "Clyde W. Phillips Jr." <cwpjr02@gmail.com> - 2013-02-10 13:43 -0800
  Re: FORTH for brute force test available? ??? ;/ Paul Rubin <no.email@nospam.invalid> - 2013-02-10 14:07 -0800
    Re: FORTH for brute force test available? ??? ;/ "Rod Pemberton" <do_not_have@notemailnotz.cnm> - 2013-02-10 19:26 -0500
    Re: FORTH for brute force test available? ??? ;/ Hannu Vuolasaho <hannu.vuolasaho@nospam.tut.fi.invalid> - 2013-02-11 04:52 +0000
    Re: FORTH for brute force test available? ??? ;/ Andy Valencia <user@vsta.org> - 2013-02-11 19:43 +0000
      Re: FORTH for brute force test available? ??? ;/ "Clyde W. Phillips Jr." <cwpjr02@gmail.com> - 2013-02-11 12:41 -0800
      Re: FORTH for brute force test available? ??? ;/ Bernd Paysan <bernd.paysan@gmx.de> - 2013-02-11 22:01 +0100
  Re: FORTH for brute force test available? ??? ;/ "Rod Pemberton" <do_not_have@notemailnotz.cnm> - 2013-02-10 19:26 -0500
    Re: FORTH for brute force test available? ??? ;/ Richard Owlett <rowlett@pcnetinc.com> - 2013-02-11 09:52 -0600
      Re: FORTH for brute force test available? ??? ;/ "Rod Pemberton" <do_not_have@notemailnotz.cnm> - 2013-02-12 08:43 -0500
        Re: FORTH for brute force test available? ??? ;/ Richard Owlett <rowlett@pcnetinc.com> - 2013-02-12 08:56 -0600
          Re: FORTH for brute force test available? ??? ;/ Howerd <howerdo@yahoo.co.uk> - 2013-02-12 11:38 -0800
          BIOS drive capacity limit, was [Re: FORTH for brute force test available? ??? ;/] "Rod Pemberton" <do_not_have@notemailnotz.cnm> - 2013-02-13 02:00 -0500

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