> Try just putting the subroutine closer to the call to see if this works.

Not closer to the call but in the first (256 instruction) half of a 512
instruction page (the call sets bit 8 to 0, no way around that). This is a
12-bit-core feature that does not apply to 14-bit-core chips like the f84
and f877. It also a pain in the as for a compiler writer. The only way to
call a subroutine anywhere in memory is to have a vector (a goto) in a
lower half of a page and call that vector.

Wouter

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