The device reads sprite bitmaps from a special set of ROMs (12K total). This tiny RAM serves as video memory and general-purpose storage for all three CPUs.Ī hardware device mapped into the top of the RAM area controls the display of 64 sprites. An 8K chunk of RAM is mapped into the exact center of the address space. CPU1, the game boss, contains 16K of code while the other 2 slave-processors contain only 4K of code each.

The Galaga machine contains three Z-80 processors that share the load of playing the game. Namco created Galaga (licensed to Midway) in 1981 as a sequel to Galaxian. Sequence of actions to get to the disabled state faster? Software - an unexpected side effect that persisted over several releases of the game ROMs? If the cheat is a glitch, what is wrong with the code? Is there another

Was the cheat purposefully added to the code as a backdoor for players in-the-know? Or is the cheat a glitch in the I rarely take the time to play out the cheat now.īut the questions always nagged for the past decades. I run into it in theatres and grocery stores and on retro-game pacs for other console systems. Kill it and none of the bees will fire for the rest of the game. His instructions went something like this: on the first stage, let all the bees form up on the screen and then kill all of the bees except the one on the bottom left.ĭodge that bee as it continues to attack, and eventually (about fifteen minutes later) it will stop firing. If you know the secret, and if you are willing to wait 15 minutes, you can make the bees In the early 80's my Uncle Mike told me about a bug in the arcade game Galaga.

The editors did a wonderful job cleaning up my writing mess:ĭebugging Commercial Code: A Quick Fix for Galaga Code in Circuit Cellar magazine November 2005. Hanson) Centipede (1982)(R.A snazzier version of this material was published in Circuit Cellar magazine. Centipede (revision 2) Centipede (bootleg) Centipede (revision 3) Centipede (1 player, timed) Centipede (Europe) (En,Fr,De,Es,It,Nl) Centipede (USA) Centipede (USA, Europe) Centipede (USA) Centipede (1982) (Atari - GCC) (CX2676) Centipede (1982) (Atari) Centipede Centipede (revision 2) Centipede (1981)(Atari) Centipede (pirated version) Centipede Centipede (1982)(R.

Galaga rom