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Gridrunner (Atari 8-bit family)

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Title Screen

Gridrunner

Developer: Llamasoft
Publishers: Llamasoft, Human Engineered Software
Platform: Atari 8-bit family
Released in US: 1983
Released in EU: 1983


SourceIcon.png This game has uncompiled source code.


Gridrunner is a Centipede-inspired arcade-y shooter and Llamasoft's first original title.

Uncompiled Source

The UK cassette version has bits of source code starting at tape block 29. They are loaded to memory together with the rest of the game.

       INC ZAPX
       LDA ZAPX
       CMP #$27
       BNE NORAP
       LDA #$02
       STA ZAPX
NORAP  STA XP
       LDA #$04
       STA CHAR
       JSR PLOT
       LDA ZAPY
       STA YP
       LDA #$00
       STA XP
       LDA #$00
       STA CHAR
       JSR PLOT
       INC ZAPY
       LDA ZAPY
       CMP #$14
NORAP2 STA YP
       LDA #$02
       STA CHAR
       JSR PLOT
       DEC PULSCNT
       BNE FIN
       LDA PFREQ
       STA PULSCNT
       LDA ZAPX
       STA PULSX
       LDA ZAPY
       STA PULSY
       LDA #$01
       STA PULSX2
       LDA