If you're feeling adventurous you could try the attached.
It's a modified version of the DT_INTS-18_K42b.bas code from post #9 with the context save stuff removed (now done in hdw) and the MOVFF instructions replaced with MOVFFL, which is required in the K42 and K83 since the SFR's are outside the 2K boundary for the MOVFF instruction.
It's completely untested...




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