Gridrunner (Atari 8-bit family)

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