SERIN Timeout

[George]

I've now tried DT's interupt files - however I get a million errors - ie. not being able to fit variables - sigh
ERROR: Variable wsave3 position request 416 beyond RAM_END 95.
ERROR: Variable wsave2 position request 288 beyond RAM_END 95.
ERROR: Variable wsave1 position request 160 beyond RAM_END 95.
that sort of thing

Any advice on how to do this would be greatly appreciated - I've just about pulled all my hair out!

How do you do an interrupt in ASM for this simply so that it will come out of the serin command - increment a timing incrementation and go back to the serial loop it's stuck in?

Thanks in advance