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Article #43566

Re: Info on OS-9000

#43566
From: James Jones
Date: Tue, 23 Nov 1993 11:59
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In article <9311230542.AA15714@relay1.UU.NET> "Brian D. Wright" <bdw@PAUL.SPU.ED
 U> writes:
>Does it translate the #asm directives in C source to Intel instructions?

No, it doesn't.

Since my original reply didn't address C source level compatibility, perhaps
I should say something about that.

There are differences between OS-9/68000 and OS-9000.  For example, a disk
defragmenter for OS-9 will definitely require work to port, because RBF
devices are laid out considerably differently.  (One big example: if OS-9000
RBF sees that the entire contents of a file would fit in the file descriptor
sector, it will put them there.)  Also, if you're moving from OS-9/68000 to
OS-9000/80x86, then you have moving between processors to worry about--the
canonical example of this being byte ordering.

OTOH, there is a library that tries to simplify ports from OS-9 to OS-9000
by providing as similar as possible an interface to the system calls, and
of course things that don't directly deal with system calls can be quite
portable.

        James Jones

Opinions (and errors, if any) herein are those of their respective authors,
and not necessarily those of any organization.
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From: James Jones <jejones@MICROWARE.COM>
Subject: Re: Info on OS-9000
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