I happen to also be working with the PIC18F24J50 for the RTCC and just tried DT's Interrupts for it and got an error. It may have already been addressed in this thread that has become short of a book but here it is:
Symbol not previously defined (RTTCIP)
Found a typo here:
Code:
asm
; -- Added for ver. 3.3 --
  ifdef RTCCIF  ;----{ RTTC }-------------------------------[PIR3, RTCCIF]---
      INT_Source  PIR3,RTCCIF, PIE3,RTCCIE, IPR3, RTTCIP
  endif
endasm
Data sheet Register 9-12 shows IPR3.0 labeled as RTCCIP, so I changed it to the following and error message gone.
Code:
asm
; -- Added for ver. 3.3 --
  ifdef RTCCIF  ;----{ RTTC }-------------------------------[PIR3, RTCCIF]---
      INT_Source  PIR3,RTCCIF, PIE3,RTCCIE, IPR3, RTCCIP
  endif
endasm
By the way, many thanks to Darrel for this extremely fine piece of work that looks like it took a lot of time and doing then to just give it to everyone.