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