mirror of
https://github.com/nathanriggs/AppleIIAsm-Collection.git
synced 2024-12-02 12:52:03 +00:00
c8cac53c5e
Massive updates that changes the way most subroutines are handled. Major bugfixes, various utilities added, started higher-level libraries.
134 lines
2.5 KiB
Plaintext
134 lines
2.5 KiB
Plaintext
ADIM82
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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 :FILL
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PLA
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STA :MCAND
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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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LDA #0
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STA :MCAND+1
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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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:DOADD
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CLC
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ADC :AXSIZE
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TAX
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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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: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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STX :MLIER
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STY :MLIER+1
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LDA #0
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STA :PROD
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STA :PROD+1
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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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CLC
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INC :PROD
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INC :PROD
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INC :PROD
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BCC :NOCAR
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INC :PROD+1
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:NOCAR
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LDA :FILL
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LDX :PROD+1
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; GO BEYOND A 16BIT VALUE;
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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
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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
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:MFEXIT
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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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LDA RETADR+1
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PHA
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LDA RETADR
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PHA
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LDY ADDR1
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LDX ADDR1+1
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LDA :PROD
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STA RETURN
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LDA :PROD+1
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STA RETURN+1
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LDA :PROD+2
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STA RETURN+2
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LDA :PROD+3
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STA RETURN+3
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LDA #4
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STA RETLEN
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LDA :MCAND
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RTS
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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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:FILL DS 1
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