Re: Why dosemu can not access internal harddisks while running from latest GRML in live CD mode?

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Dear Janusz,
I do not know, how to simulate The boot from The bootable CD or DVD from
running Dosemu, i did not understand The command sintax for this operation.
Next isue is, if i will be able to emulate booting from boot media
successfully, if i will not lost The opportunity to use Speakup screen

I don't think dosemu is the sort of tool that is best suited to testing or analysing the boot process of a CD/DVD for operating system recovery.

dosemu does not emulate every feature of a DOS PC, only the ones needed so far to run certain DOS programs. As far as I understand it, dosemu currently only emulates DMA as used in the sound cards, and not as a full PC behaves. If you were to enable direct hard disk access and try an operating system it would probably fail as it attempted to switch from PIO mode to DMA mode for disk I/O.

I think you should be looking at a 'virtual machine' such as VMware (which I have used to run DOS 6.22 and Windows 95 for testing), or one of the others such as Zen, VirtualBox, etc:

I don't know how easy it would be to make a 'live CD' with one package installed and configured, so I would suggest installing a Linux distribution on a suitable PC, maybe with a new large HDD (couple of times the HDD you want to emulate) and plenty of memory (say 512MB plus the expected memory for the tested operating system), then installing something like VMware player (which is free, but not open source) and then trying to create a new blank machine and boot your CD/DVD and see if it will restore the 'virtual disk' as you want it to.

The advantage of such an approach is you can simply delete the virtual drive and create a new on in minutes, and you can (with some versions) create snapshots of the system before installing patches, new software, etc, or just to mount them to see what the HDD looked like at that point in time.

dosemu is really only for running DOS software that is reasonably well behaved. If you do use it for direct hardware access (which we do) then it really works best/most reliably for non-operating system components such as special peripherals.

 Dr. Paul S. Crawford
 c/o Satellite Station
 University of Dundee
 Small's Wynd, Dundee, DD1 4HN
 Email: psc@xxxxxxxxxxxxxxxx
 Tel: +44 (0)1382 38 4687
 The University of Dundee is a Scottish Registered Charity, No. SC015096
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