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System 11 RottenDog Support

Notes for installing Vector on games running a RottenDog aftermarket processor board (part number MPU9211) instead of the original Williams System 11 CPU board.

Table of contents

Overview

Games that have been converted to a RottenDog MPU9211 processor board run the same System 11 ROMs, but the replacement board is not a perfect electrical match for the original Williams CPU board. Vector still installs the same way — in place of the main processor — but a small modification on the RottenDog board is recommended to get reliable results.

Disclaimer

Removing and reseating chips carries risk, and modifying a resistor on the RottenDog board is a permanent hardware change. Work with the game powered off but grounded, discharge static on the metal backplane, and verify sockets and ICs are fully seated before powering up. Warped Pinball offers email support but cannot be liable for damage to your RottenDog board or game.

Resistor R42 modification

RottenDog MPU9211 boards typically ship with R42 at 33k ohms. Warped Pinball recommends changing R42 to 10k ohms so the processor comes out of the reset state cleanly with Vector installed.

R42 location on RottenDog board

  1. Locate R42 on the RottenDog board (pictured above).
  2. Remove the existing 33k resistor.
  3. Install a 10k resistor in its place.

If you have questions about this modification, contact Warped Pinball before making changes.

Installing Vector

Vector install location on RottenDog board

  1. Power off the machine.
  2. Remove the main processor chip from the RottenDog MPU9211 board and install it into Vector's 40-pin socket, matching pin #1 and checking for bent pins.
  3. Install Vector onto the RottenDog board the same way it installs on an original Williams System 11 CPU board — see the System 11 manual for the general procedure and photos.

Close-up of the clip location on the RottenDog board:

Clip location close-up on RottenDog board