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Using SETBRK instructions during debug ISR's
I've discovered that a "spacer" instruction is needed after
a SETBRK instruction otherwise invalid values are returned in INA/INB.
setbrk #%1000000 'ina/inb as pin status
mov porta,ina 'get pins
setbrk #1 'ina/inb as ISR data
mov next_pc,inb 'get CZ flags & PC