mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-12-12 01:30:00 +00:00
ad58479739
- major bugfixes, especially in 2D arrays - separated each subroutine into own file - reconfigured arrays to use 1-based indexing - Arrays.demo uses macros now - added overflow error handling to get and put routines
198 lines
4.6 KiB
Plaintext
198 lines
4.6 KiB
Plaintext
*
|
|
*``````````````````````````````*
|
|
* ADIM81D : INIT 1D ARRAY *
|
|
*- -*
|
|
* CREATES AN ARRAY OF LENGTH *
|
|
* [:ASIZE] WITH ELEMENTS OF *
|
|
* LENGTH [:ESIZE] AT MEMORY *
|
|
* LOCATION POINTED TO BY *
|
|
* [:ALOC]. RETURNS ARRAY START *
|
|
* LOCATION IN .A *
|
|
*- -*
|
|
* FIRST BYTE OF MEMORY USED *
|
|
* HOLDS LENGTH OF ARRAY; *
|
|
* SECOND BYTE HOLDS LENGTH OF *
|
|
* ELEMENTS. *
|
|
*- -*
|
|
* CLOBBERS: *
|
|
* *
|
|
* FLAGS: ????---- REG: AXYM *
|
|
*- -*
|
|
* CYCLES: ??? *
|
|
* SIZE: *
|
|
*- -*
|
|
* USAGE: *
|
|
* *
|
|
* LDA #>$300 ; ARRAYLOC *
|
|
* PHA *
|
|
* LDA #<$300 *
|
|
* PHA *
|
|
* LDA #10 ; ARRAY SIZE *
|
|
* PHA *
|
|
* LDA #2 ; ELEMENT SIZE *
|
|
* PHA *
|
|
* LDA #$AA ; FILL VALUE *
|
|
* PHA *
|
|
* JSR DIM81 *
|
|
*- -*
|
|
* ENTRY *
|
|
* *
|
|
* TOP OF STACK *
|
|
* *
|
|
* LOW BYTE OF RETURN ADDRESS *
|
|
* HI BYTE OF RETURN ADDRESS *
|
|
* FILL VALUE *
|
|
* ELEMENT SIZE *
|
|
* ARRAY SIZE *
|
|
* LOW BYTE OF ARRAY ADDRESS *
|
|
* HIGH BYTE OF ARRAY ADDRESS *
|
|
*- -*
|
|
* EXIT *
|
|
* *
|
|
* TOP OF STACK *
|
|
* *
|
|
* LOW BYTE OF RETURN ADDRESS *
|
|
* HI BYTE OF RETURN ADDRESS *
|
|
* *
|
|
* .Y = LO BYTE OF ARRAY ADDR *
|
|
* .X = HI BYTE OF ARRAY ADDR *
|
|
* .A = ARRAY SIZE *
|
|
* *
|
|
* [RETURN] = TOTAL SIZE OF *
|
|
* ARRAY IN BYTES (WORD) *
|
|
*,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,*
|
|
*
|
|
ADIM81
|
|
*
|
|
** SAVE RETURN ADDRESS
|
|
*
|
|
PLA
|
|
STA RETADR
|
|
PLA
|
|
STA RETADR+1
|
|
*
|
|
** GET PARAMETERS
|
|
*
|
|
PLA
|
|
STA :FILL ; FILL VALUE
|
|
PLA
|
|
STA :ESIZE ; ELEMENT SIZE
|
|
STA :ESZBAK
|
|
PLA
|
|
STA :ASIZE ; ARRAY SIZE
|
|
STA :ASZBAK
|
|
PLA
|
|
STA ADDR1 ; ARRAY ADDRESS
|
|
PLA
|
|
STA ADDR1+1
|
|
LDY #0
|
|
LDA #0
|
|
STY SCRATCH
|
|
BEQ :ENTLP
|
|
*
|
|
** MULTIPLY [:ASIZE] AND [:ESIZE] TO GET
|
|
** TOTAL SIZE OF MEMORY TO CLEAR AND USE
|
|
*
|
|
:DOADD
|
|
CLC
|
|
ADC :ASIZE
|
|
TAX
|
|
*
|
|
TYA
|
|
ADC SCRATCH
|
|
TAY
|
|
TXA
|
|
*
|
|
:LP
|
|
ASL :ASIZE
|
|
ROL SCRATCH
|
|
:ENTLP
|
|
LSR :ESIZE
|
|
BCS :DOADD
|
|
BNE :LP
|
|
*
|
|
CLC
|
|
INX
|
|
INX ; INCREASE BY TWO
|
|
; TO MAKE ROOM FOR SIZES
|
|
BCC :NOINY ; IF .X ROLLS OVER, INC .Y
|
|
INY
|
|
:NOINY
|
|
STX :MSIZE ; LOW BYTE
|
|
STY :MSIZE+1 ; HIGH BYTE
|
|
*
|
|
** NOW CLEAR MEMORY BLOCKS
|
|
*
|
|
** FILL WHOLE PAGES FIRST
|
|
*
|
|
LDA :FILL ; FILL VALUE
|
|
LDX :MSIZE+1
|
|
BEQ :PART ; IF NO WHOLE PAGES, JUST PART
|
|
LDY #0
|
|
:FULL
|
|
STA (ADDR1),Y
|
|
INY ; NEXT BYTE
|
|
BNE :FULL ; LOOP UNTIL PAGE DONE
|
|
INC ADDR1+1 ; GO TO NEXT PAGE
|
|
DEX
|
|
BNE :FULL ; LOOP IF PAGES LEFT
|
|
*
|
|
** NOW DO REMAINING PARTIAL PAGES
|
|
*
|
|
:PART
|
|
LDX :MSIZE ; PARTIAL PAGE BYTES
|
|
BEQ :MFEXIT ; EXIT IF = 0
|
|
LDY #0
|
|
:PARTLP
|
|
STA (ADDR1),Y ; STORE VAL
|
|
INY ; INC INDEX
|
|
DEX ; DEC COUNTER
|
|
BNE :PARTLP ; LOOP UNTIL DONE
|
|
:MFEXIT
|
|
*
|
|
** MEMORY FILL IS DONE
|
|
*
|
|
** THEN, SET SIZES
|
|
*
|
|
LDY #0
|
|
LDA :ASZBAK
|
|
STA (ADDR1),Y
|
|
INY
|
|
LDA :ESZBAK
|
|
STA (ADDR1),Y
|
|
*
|
|
** RESTORE RETURN ADDRESS
|
|
*
|
|
LDA RETADR+1
|
|
PHA
|
|
LDA RETADR
|
|
PHA
|
|
*
|
|
** RETURN POINTER TO STARTING ADDR OF ARRAY
|
|
*
|
|
LDY ADDR1 ; LOW
|
|
LDX ADDR1+1 ; HIGH
|
|
LDA :ASZBAK
|
|
*
|
|
** STORE TOTAL ARRAY SIZE IN BYTES
|
|
** IN MEMORY ALLOCATED FOR RETURN VALUES
|
|
*
|
|
LDA :MSIZE
|
|
STA RETURN
|
|
LDA :MSIZE+1
|
|
STA RETURN+1
|
|
LDA #2
|
|
STA RETLEN ; 2 BYTE LENGTH
|
|
*
|
|
RTS
|
|
*
|
|
** DATA
|
|
*
|
|
:MSIZE DS 2
|
|
:ASIZE DS 1
|
|
:ESIZE DS 1
|
|
:ASZBAK DS 1
|
|
:ESZBAK DS 1
|
|
:FILL DS 1
|
|
*
|