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From: rms@frog.UUCP
Newsgroups: comp.sys.m6809
Subject: Re: OS9 load command
Message-ID: <1941@frog.UUCP>
Date: Wed, 18-Nov-87 15:43:00 EST
Article-I.D.: frog.1941
Posted: Wed Nov 18 15:43:00 1987
Date-Received: Sat, 21-Nov-87 11:42:51 EST
References: <1987Nov16.142303.4540@gpu.utcs.toronto.edu>
Organization: Superfrog Heaven [ CRDS, Framingham MA ]
Lines: 30
Summary: Error #207 on some load commands

In article <1987Nov16.142303.4540@gpu.utcs.toronto.edu>, ac@gpu.utcs.toronto.edu (Mark Acfield) writes:
> OS9 level II command also allows this syntax but if you specify to many 
> modules you will get a 207 error. 
> 

The OS9 Level II load command attempts to load all of the files specified
on the line into the same page of memory.  If all of the modules will not
fit in a page, the error #207 results.

Perhaps, the load command could be more clever and load into multiple pages
when necessary.  However, that may not be what the user had in mind.  It
may be necessary for certain modules to occupy the same page for various
reasons.

This feature of load has a good point.  For instance, OS9 Level
II has problems if you load a device driver and an associated device
descriptor into separate pages of memory.  However, if you load them into
the same page of memory, the system will work fine (almost) up to a point.
As far as I can figure, this works for device drivers once, and only a
single driver/descriptor pair can be accessed in this way.  This is fine
for debugging a driver.

With the current state of load, one should calculate the size of the text
sections of the modules desired and use a separate load line for each
group that has a total text size less than 8K.

Your point about a multiple module set of commands is well taken.  Maybe
someone will come up with such a set of commands.

Bob Santy