mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-12-01 06:49:59 +00:00
44 lines
1.2 KiB
Plaintext
44 lines
1.2 KiB
Plaintext
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MEMFILL
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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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PLA
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STA :VALUE
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PLA
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STA :ARYSZ
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PLA
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STA :ARYSZ+1
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PLA
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STA ADDR1 ; ZERO PAGE POINTER
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PLA ; DEFINED IN
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STA ADDR1+1 ; DECS
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LDA :VALUE ; GET VAL FOR FILL
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LDX :ARYSZ+1 ; X=# OF PAGES TO DO
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BEQ :PARTPG ; BRANCH IF HIGHBYTE OF SZ = 0
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LDY #0
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:FULLPG
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STA (ADDR1),Y
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INY ; INC TO NEXT BYTE
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BNE :FULLPG ; BRANCH IF NOT DONE W/ PAGE
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INC ADDR1+1 ; ADVANCE TO NEXT PAGE
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DEX
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BNE :FULLPG ; BRANCH IF NOT DONE W/ PAGES
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:PARTPG
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LDX :ARYSZ ;GET # OF BYTES IN FINAL PAGE
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BEQ :EXIT ; BRANCH IF LOW BYTE = 0
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LDY #0
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:PARTLP
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STA (ADDR1),Y ; STORE VAL
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INY ; INCREMENT INDEX
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DEX ; DECREMENT COUNTER
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BNE :PARTLP ; BRANCH IF NOT DONE
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:EXIT
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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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RTS
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:VALUE DS 1 ; FILL VALUE
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:ARYSZ DS 2 ; ARRAY SIZE
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