To assist others that may have the same problems I will answer my own post:

Below is what I had to do, it appears that I was not using the
accessram, I did try things like the near and far but they do not work
until you put
"#pragma udata access accessram"

I expect reducing the stack may have helped but I don't know enough to
be sure I am not going to cause other problems.
I have taught myself C over the last few weeks so still have a lot of
holes in my knowledge but are slowly getting there.


regards

Lee McLaren


//variables
//---------------------------------------------------------------------
#pragma udata access accessram
near unsigned char buffer[54];

//---------------------------------------------------------------------
#pragma udata
unsigned char Stop;
unsigned char debounced_state;
unsigned char clock_A;
unsigned char clock_B;
unsigned char DiscReg[1];  // Discrete Inputs     02 10001 R






Jan-Erik Soderholm wrote:
> Lee McLaren wrote :
>
>   
>> I am writing a program in C18 for the 18F1320 and keep running out 
>>     
> of
>   
>> data memory, according to the "Memory Usage Gauge" in MPLAB 7.30 I 
>>     
> am
>   
>> only using 138 out of 256 but every time I try to increase 
>> the size of a serial buffer I get:...
>>     
>
> It seems as the C18 stack is "eating" half of your mem :
>
>   
>> SHAREBANKS:
>>
>> DATABANKS:
>>  Memory  Start     End      Section 
>>  ---------  ------     ---        ---------
>>       gpr0  0x0080  0x00f3 .stack   
>>     
>
>
> Maybe try to decrease the stack size (no idea how to do that).
>
> Or, of course, rewrite your app or use a processor with
> more RAM...
>
> Jan-Erik.
>
>
>
>   
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