Briefly, maximum number of vars?

[Chris Barron]

Chris,

Accessing your vars in your asm routine without knowing which bank they're in, or handling BSR, is most, if not all, of the problem I suspect.

If all of your vars will fit into 1 bank, just tell PBP to place them all in the same bank, then set BSR to this bank on entry to your int handler.

Thanks Bruce. What i've assumed is that because all of my vars do fit into one bank if i put them at the start of the declarations they will be placed there. The problem with the extra vars is happening whether I place the extra vars before or after my own. it doesn't seem to matter where I put them the fault doesn't go away until I comment out enough of them to get the total number down. But I take your point about using the BSR in the interrupt. I think I have relied too much on PBP and overseen the fact that I still need to obey Microchip's laws !