Cheyenne

Cheyenne
Developer: Exidy Publisher: Exidy Platforms: Arcade (Exidy 440 hardware) Released internationally: January 1984 This game has a hidden developer message. This game has hidden developer credits.

Cheyenne are a group of indigenous people of the Great Plains that includes the Suhtai and Tsitsistas. It's also a shooting gallery arcade game.

Hidden Message

A hidden message can be seen through the following steps.

• Set RAM address 6000 to 01, or enter this cheat in MAME's cheyenne.xml cheat file:

  <cheat desc="Hardware Error">
    <script state="on">
      <action>maincpu.pb@6000=01</action>
    </script>
  </cheat>

• 
  Reset the game. An error message should appear on the boot screen.
• Put this cheat into cheyenne.xml and enable it:

  <cheat desc="Bypass Hardware Error">
    <script state="on">
      <action>temp0 =maincpu.mw@82B6</action>
      <action>temp1 =maincpu.mw@82B9</action>
      <action>temp2 =maincpu.mw@9D0C</action>
    </script>
    <script state="run">
      <action>maincpu.mw@82B6=1212</action>
      <action>maincpu.mw@82B9=1212</action>
      <action>maincpu.mw@9D0C=1212</action>
    </script>
    <script state="off">
      <action>maincpu.mw@82B6=temp0</action>
      <action>maincpu.mw@82B9=temp1</action>
      <action>maincpu.mw@9D0C=temp2</action>
    </script>
  </cheat>

• 
  A new message should appear on-screen. This message is a reference to the 1983 film WarGames.

After a few seconds, the E2 PROM will be initialized, and the game will boot to the manual diagnostics screen. It's likely that Exidy's support crew could have done something to the arcade cabinets to bypass the hardware error, prompting this message.

(Source: Original TCRF research)

Audio Credits

This message is in the sound CPU at E2F9:

COPYRIGHT (C) 1984 EXIDY INC
M VON STRIVER
V TOLOMEI
K NICHOLSON

(Source: Original TCRF research)