OS/2 vs Win3.1
bert at brothom.nl
Sat Oct 15 03:15:19 CDT 2005
> How does OS/2 warp V3 compare to other PC OSs like CDR Concurrnet386 or
I don't know anything about Concurrent386, but comparing OS/2 Warp with
win 3.1 is like comparing pigs with streetlights.
Win3.1 is a graphical shell around DOS. To overcome DOS' memory
limitations is uses some more advanced techniques of the processor, such
as protected mode. However, win3.1 programs are 16-bit. Win3.1 itself is
16 bit. Win 3.1 only allows cooperative multitasking. That means that a
another program can only get control if the running program gives it up.
This is a very short summery of Win3.1
OS/2 2.0 and higher are 32-bit operating systems. However, compatibility
with older OS/2 applications was considered very important and therefore
parts of the kernel and all device drivers are mainly 16 bit. Only
recently some 32-bit device drivers were written.
OS/2 has its own graphical subsystem - a very advanced one. It can run
DOS programs in 'virtual dos machines' or VDM. A special mode of the 386
processor allows a task to act as if it where a real mode task. Anything
that task does can trap the processor and thus can be handled by
exception handlers. OS/2 is very strong is this area.
OS/2 has its own file system with some special features like "extended
OS/2 has dynamic priorities for tasks, that makes it more responsive.
For example, a task that has focus in the GUI is slightly raised in
priority. Or when a background task was blocking for something it might
receive a slight priority boost when that something becomes available.
OS/2's time critical priority is handled "soft realtime". I've used OS/2
in the past for process control, dosing in particular. For such
applications realtime behaviour is very important as a lattency of 1 sec
or more is disasterous for the product being manufactered.
I can go on and on, but if you want to know more let me know and I write
it down later on.
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