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Path: utzoo!utgpu!water!watmath!clyde!rutgers!husc6!think!ames!oliveb!pyramid!voder!wlbr!pete
From: pete@wlbr.UUCP
Newsgroups: comp.sys.m6809
Subject: Re: os9 level II full screen editor
Message-ID: <1027@wlbr.UUCP>
Date: Tue, 26-May-87 15:56:04 EDT
Article-I.D.: wlbr.1027
Posted: Tue May 26 15:56:04 1987
Date-Received: Thu, 28-May-87 01:16:54 EDT
References: <20@abvax.abnet.com> <58400009@gorgo.UUCP>
Reply-To: pete@wlbr.UUCP (0000-Pete Lyall)
Organization: Eaton IMS, Westlake Village, CA
Lines: 45

In article <58400009@gorgo.UUCP> bsteve@gorgo.UUCP writes:
>

(grunch of debated/rebutted comments removed)

>THIS IS NOT A SILLY IDEA. The outward structure is pretty much the same and
>in fact several system calls did change between the versions. Software
>vendors took advantage of the fact that the full address-space was available
>in level I. 

(more stuff whacked)

>
>>     It's certainly no accident or matter of luck that code is portable
>>between Level I and Level II.
>
>This is true. The mechanism for upward portability was built into both
>level I and level II. I wish more software authors had followed it. Folks
>need to know about this so that they don't get burned by it.
>

I have been running LII for around 2 years, and LI for around 4. I am
painfully aware of the differences, but let me make this rash
statement:

Level 2 system calls are NOT different than level I system calls.
There are *more* calls under level 2, but those that share the same
name perform the same function.

Also, what software vendors are you referring to?? All of my level I
application stuff works just dandy under LII. The only place I know
you get into trouble is when you rely upon information in the direct
page.


-- 
                                                   Pete Lyall

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