Its been a while since I've had to code into page 1.  If you have an ISR
being triggered by TMR0, such that it is always going into it, what happens
when you enter it from page1, make calls from the ISR into page0 then return
back to page1.

Does the stack contain the fact that you started in page1, so will it return
ok back there or do I (should I) disable interupts when I am running stuff
in page1

How deep is the stack for calls/returns?  This is on an 877 device

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