> -----Original Message-----
> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu]On Behalf Of Phil Cross
> 
> My  whole argument has been about the different VALUES of 
> configuration bits  generated by CONFIG and __CONFIG, 
> which seems to be down to CONFIG setting 
> unused bits to '0', but __CONFIG setting them to '1'.

This is a valid question to Microchip and I do not
want to say that Microchip is always right with MPLAB. 
In fact, MPASM 5.01 and MPLAB C18 V3.01 have fixed 
some problems with CONFIG settings and there may still
be some errors.

There are quite some problems with the wrong CONFIG
options which break some codes (even the Microchip
examples). For example, PICKit 2 firmware will fail to
build with the V3.01 version of MPLAB C18 due to
the wrong config options used in the old version of
MPLAB C18.

MPLAB C18 v3.02 is just out. I have not checked it out.
You may want to check out the readme for V3.01 and V3.02.

Release Notes for MPLAB(R) C18, PICmicro(R) 18Cxx C Compiler
v3.01
18 November, 2005
...
(27358 / 27515) The #pragma config directive causes unimplemented bits
        to become 0, but should be left a '1'.
        Unimplemented/reserve bits are now included in the mask and
        default settings when the bit must be maintained set.
...


Here is the readme file for MPASM V5.01 (comes with
MPLAB C18 V3.01)


Release Notes for MPASM(TM) Assembler version v5.01
18 November, 2005
...
-----------------------------------------------------------------
Repairs and Enhancements Made in v5.01
-----------------------------------------------------------------

Problems resolved:

(27358 / 27515) The new config directive causes unimplemented bits to
        become 0, but should be left a '1'.
        Unimplemented/reserve bits are now included in the mask and
        default settings when the bit must be maintained set.

        Following are the devices and configuration words that were
        corrected:
        ...

Hope this helps.

Regards,
Xiaofan

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