mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-11-24 07:31:09 +00:00
eb2b7deea0
- 16bit array subroutines will be added here at a later date. - Strings library separated from arrays on its own disk in anticipation of larger libraries.
215 lines
4.6 KiB
Plaintext
215 lines
4.6 KiB
Plaintext
*
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*``````````````````````````````*
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* DIM82 :: INIT 2D ARRAY *
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*- -*
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* THIS SIMPLY CREATES A 1D *
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* ARRAY WITH THE DIM OF *
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* ARRAYX BY ARRAYY. *
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*- -*
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* FIRST BYTE OF MEMORY USED *
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* HOLDS LENGTH OF X (ROWS); *
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* SECOND BYTE HOLDS LENGTH OF *
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* Y (COLUMNS); THIRD BYTE *
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* HOLDS LENGTH OF EACH ELEMENT *
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*- -*
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* CLOBBERS: *
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* *
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* FLAGS: ????---- REG: AXYM *
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*- -*
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* CYCLES: ??? *
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* SIZE: *
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*- -*
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* USAGE: *
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* *
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* LDA #>$300 ; ARRAY ADDR *
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* PHA *
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* LDA #<$300 *
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* PHA *
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* LDA #4 ; X DIMENSION BOUND *
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* PHA *
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* LDA #4 ; Y DIMENSION BOUND *
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* PHA *
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* LDA #1 ; ELEMENT BYTESIZE *
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* PHA *
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* JSR DIM82 *
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*- -*
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* ENTRY *
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* *
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* TOP OF STACK *
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* *
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* LOW BYTE OF RETURN ADDRESS *
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* HI BYTE OF RETURN ADDRESS *
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* ELEMENT SIZE IN BYTES *
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* Y DIMENSION BOUNDARY *
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* X DIMENSION BOUNDARY *
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* ARRAY ADDRESS, LOW BYTE *
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* ARRAY ADDRESS, HIGH BYTE *
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*- -*
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* EXIT *
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* *
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* TOP OF STACK *
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* *
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* LOW BYTE OF RETURN ADDRESS *
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* HI BYTE OF RETURN ADDRESS *
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* *
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* Y = ARRAY ADDRESS LO BYTE *
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* X = ARRAY ADDRESS HI BYTE *
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* A = CLOBBERED *
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*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
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*
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DIM82
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*
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** SAVE RETURN ADDRESS
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*
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PLA
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STA RETADR
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PLA
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STA RETADR+1
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*
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** GET PARAMETERS
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*
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PLA
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STA :MCAND ; ELEMENT LENGTH
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PLA
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STA :AYSIZE
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STA :AYBAK
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PLA
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STA :AXSIZE
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STA :AXBAK
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PLA
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STA ADDR1
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PLA
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STA ADDR1+1
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*
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** LOOP THROUGH Y, CLEARING MEMORY
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** FOR X BYTES TIMES ELEMENT SIZE,
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** MOVING TO END OF LAST CLEAR
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** UNTIL FINISHED
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*
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** MULTIPLY X AND Y
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*
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LDA #0
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TAY
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STY SCRATCH
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BEQ :ENTLP
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*
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:DOADD
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CLC
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ADC :AXSIZE
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TAX
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*
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TYA
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ADC SCRATCH
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TAY
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TXA
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*
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:LP
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ASL :AXSIZE
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ROL SCRATCH
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:ENTLP
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LSR :AYSIZE
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BCS :DOADD
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BNE :LP
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*
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STX :MLIER
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STY :MLIER+1
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*
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** NOW MULTIPLY BY LENGTH OF ELEMENTS
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*
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LDA #0
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STA :PROD+2
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STA :PROD+3
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LDX #$10
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:SHIFTR LSR :MLIER+1
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ROR :MLIER
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BCC :ROTR
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LDA :PROD+2
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CLC
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ADC :MCAND
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STA :PROD+2
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LDA :PROD+3
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ADC :MCAND+1
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:ROTR
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ROR
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STA :PROD+3
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ROR :PROD+2
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ROR :PROD+1
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ROR :PROD
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DEX
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BNE :SHIFTR
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*
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INC :PROD ; INCREASE BY 3
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INC :PROD
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INC :PROD
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LDX :PROD
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LDY :PROD+1
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*
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** NOW CLEAR MEMORY BLOCKS, WHOLE PAGES FIRST
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*
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LDA #$00 ; FILL VALUE
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LDX :PROD+1 ; NOTE THAT THIS WON'T
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; GO BEYOND A 16BIT VALUE;
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; ANYTHING HIGHER THAN
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; 16BITS IS MORE THAN
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; THERE IS MEMORY IN A
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; STANDARD APPLE ][
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BEQ :PART
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LDY #0
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:FULL
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STA (ADDR1),Y
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INY
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BNE :FULL
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INC ADDR1+1
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DEX
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BNE :FULL ; LOOP UNTIL PAGES DONE
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*
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** NOW DO REMAINING BYTES
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*
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:PART
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LDX :PROD
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BEQ :MFEXIT
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LDY #0
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:PARTLP
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STA (ADDR1),Y
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INY
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DEX
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BNE :PARTLP ; LOOP UNTIL DONE
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:MFEXIT
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*
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** NOW SET SIZES
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*
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LDY #0
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LDA :AXBAK
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STA (ADDR1),Y
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INY
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LDA :AYBAK
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STA (ADDR1),Y
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INY
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LDA :MCAND
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STA (ADDR1),Y
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*
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** RESTORE RETURN ADDRESS
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*
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LDA RETADR+1
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PHA
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LDA RETADR
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PHA
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*
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** RETURN POINTER TO STARTING ADDRESS OF ARRAY
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*
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LDY ADDR1
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LDX ADDR1+1
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*
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RTS
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*
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** DATA
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*
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:PROD DS 4
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:AXSIZE DS 1
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:AYSIZE DS 1
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:AXBAK DS 1
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:AYBAK DS 1
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:MLIER DS 2
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:MCAND DS 2
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*
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