AppleIIAsm-Collection/source/disk5_strings/T.REQUIRED.VARS

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* VARIABLES AND SETTINGS       *
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* VARIABLE DECLARATIONS ********
*
** JUMP TABLE SETUP. THIS IS FOR LOADING
** SUBROUTINES INTO MEMORY FOR ACCESS BY
** EXTERNAL EXECUTIONS. NOTE THAT THIS
** SHOULD ALWAYS BE THE VERY FIRST BIT OF
** CODE IN THE PROGRAM SO THAT ITS
** LOCATION IN MEMORY IS EASILY KNOWN.
*
JUMPTBL  JMP   MAIN_START ; ** ALWAYS ** START WITH
                          ; JUMP TO MAIN_START
         DS    60         ; 20 MORE ENTRIES
*
** 256 BYTES DEDICATED TO RETURN
** VALUES OF VARIABLE LENGTH; CAN BE
** MODIFIED TO SUIT SMALLER OR LARGER
** NEEDS.
*
RETLEN   DS    1          ; RETURN VALUE BYTE LENGTH
RETURN   DS    256
*
** 256 BYTE VALUE DEDICATED TO LARGE
** OR VARIABLE LENGTH PARAMETERS. THIS
** CAN ALSO BE CHANGED TO FIT SMALLER OR
** LARGER BOUNDS.
*
PARLEN   DS    1
PARAM    DS    256
*
** ERROR HANDLING
*
ERRSTOP  DS    1
ERRCTRL  DS    1
ERRA     DS    1
ERRX     DS    1
ERRY     DS    1
ERRCARRY DS    1
ERRNEG   DS    1
ERRZERO  DS    1
ERROVF   DS    1
*
* SETTINGS *********************
*
MAIN_START
*
** ERROR HANDLING
*
** SET ERRSTOP TO 1 IF YOU WANT THE PROGRAM TO
** HALT WHEN AN ERROR IS CAUGHT
*
         LDA   #1
         STA   ERRSTOP
*
** SET ERRCTRL TO 1 IF YOU WANT ERROR CATCHING ON
** IN THE FIRST PLACE. HAVING THIS TURNED OFF WILL
** SAVE A FEW CYCLES, BUT POSSIBLY AT THE EXPENSE
** OF YOUR FRUSTRATION. CAN BE TURNED ON LATER THOUGH.
*
         LDA   #1
         STA   ERRCTRL
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