On January 5, 2006 07:27 pm, Sean Schouten wrote:
> > Res only works in relocatable code have to use a linker file etc.
> > I'm sure Olin will be all over me but to attempt to understand
> > assembler absolute code is easyer.

Actually, it also works in the older DOS mpasm, so it's not as recent 
you think.  ;-)
Other processors may have different terminologies, for example motorola 
used rmb, so this instruction has been around quite a while now.

> Hmmm, I am missing the linker-file so I guess that that's where I
> screw up. I need to learn more about relocatable programming and
> linker-scripts. Anyhow, it's high time for me to say goodnight; I
> will try the absolute aproach to see if it does work for me tomorrow.

relocatable programming is a bit harder to learn at 1st, but better in 
the long run and works fine in MPlab or MPASM.
Because you are starting-out, you can cheat by using the 0x20 suggested 
by someone, but instead of equ, what you do is "org" so that you can 
use "res", like this:

		org	0x20	;"hard-coded" start of ram area
TEMP_VAL	res	1	;temporary value 1 location @0x20
TEMP_VAL2	res	1	;2nd temp val @0x21
TEMP_VAL_BIG	res	4	;this is a large temp val @0x22
TMP_VAL4	res	1	;another value @0x26

I would suggest compiling the above as part of your code and showing a 
list file. That should help you get an idea about the res mneumonic.
You'll note that if you want to access the large value TEMP_VAL_BIG 
above, you can access it like this:
	movf	TEMP_VAL_BIG,W
	movf	TEMP_VAL_BIG+1,W
	movf	TEMP_VAL_BIG+2,W
	movf	TEMP_VAL_BIG+3,W
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