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
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
Tel: +44 (0)1382 38 4687
The University of Dundee is a Scottish Registered Charity, No. SC015096
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