Several versions of ELAPSED_INT seems to exist. One that predates the existance of DT-Ints and one which is supposed to work WITH DT-Ints. For the one that's using DT-Ints it looks like you also need to include ReEnterPBP.bas file. Here's an example by Darrel himself, from this thread:
Code:
INCLUDE "DT_INTS-14.bas"
INCLUDE "ReEnterPBP.bas"
INCLUDE "Elapsed_INT.bas"  ; Elapsed Timer Routines

ASM
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler   TMR1_INT,  _ClockCount,   PBP,  yes
    endm
    INT_CREATE            ; Creates the interrupt processor

    INT_ENABLE  TMR1_INT  ; Enable Timer 1 Interrupts  
ENDASM

GOSUB ResetTime           ' Reset Time to  0d-00:00:00.00
GOSUB StartTimer          ' Start the Elapsed Timer

Main:
  IF SecondsChanged = 1 THEN  
     SecondsChanged = 0
     LCDOUT $FE,2, DEC Days,"d-",DEC2 Hours,":",DEC2 Minutes,":",DEC2 Seconds
  ENDIF
GOTO Main
Also, OSCFRQ = %11 can't be right but I suspect that it's the forum messing with the text.

When posting code, please use the proper code tags.

/Henrik.