Zaxxon (Apple II)

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Source Code#

Stored on the disk are fragmented bits of source code. These are found in Track 13, Sectors 6 and 7.

          X ;STORE ON SCREEN
STA $4759,X
LDA FUELTBL+5,Y
      
    $4B59,X
LDA FUELTBL+10,Y
STA $2F59,X
STA $4F59,X
LDA FUELTBL+15,Y
STA $3359,X
STA

    
LTBL+20,Y
STA $3759,X
STA $5759,X
LDA FUELTBL+25,Y
STA $3B59,X
STA $5B59,X
LDA 
  
    +30,Y
STA $3F59,X
STA $5F59,X
RETS
RTS


FUELTBL
HEX 8081818181
HEX 8081858585
HEX 80818595D5
HEX 8081859595
HEX 8081858585
HEX 8081818181


FUELS DS 1
FUELB DS 1
FUEL DS 1

    
CH2 
LDA FUELTBL,X
AND #$7F
STA FUELTBL,X
DEX
BPL CH2
RTS
***********
OR #$20
STA ODDEV
BNE ODD1
STA PAGE2
RTS


ODD1
STA PAGE1
RTS


PLANES 
LDA #238 WRITE
OR


STA YCOOD
JSR SUBPLN


SUBPLN
LDY PLAYER
LDX PLANES1,Y
DEX
BMI PDONE


LOOP44 
LDA XPO


LDA XPOS,X
JSR XORER
JMP FLIP


INCPLANE
LDA #2

References#