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Car RamRod Bringing Pinball Into the Future! Brian Arment, Ryan Hunter, Aaron Shoaf Williams ® Touchdown Originally Produced November of 1967 Electromechanical Solenoid and relay driven No solid-state devices Not in working order Original Internals

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car ramrod

Car RamRod

Bringing Pinball Into the Future!

Brian Arment, Ryan Hunter, Aaron Shoaf

williams touchdown
Williams® Touchdown
  • Originally Produced November of 1967
  • Electromechanical
  • Solenoid and relay driven
  • No solid-state devices
  • Not in working order
original internals
Original Internals

Relays and solenoids controlling game play

Relays and solenoids controlling scoring

  • Newer machines use solid state devices such as those in the more modern machine at right.
  • We will not be mimicking the design but will use the same basic idea in modernizing our old machine.
  • Micro-Controller and Board
  • Driver/Step-up Board
  • Playfield Interaction
  • A/V Controller
  • Display
  • Audio

User Input


Driver Board



25 Vac

6 Vac




Power Supply


user input
User Input
  • Two Flipper Buttons
  • Start
    • Coin or Manual Operation
  • MC 14043 Quad SR Latch – De-bouncing





MC 14043

4 line bus to MCU

micro controller
  • MC68HC11
  • Handles interrupts for input from sensors on playfield and users.
  • Controls light patterns, scoring, A/V state, game play options, game play state
  • Handles control of driver board for fail-safe solenoid operation.
micro controller9

Game Option Switches






A/V Controller

Driver Board

driver board
Driver Board
  • Provides Necessary current and voltage for devices like:
    • Solenoids (flippers, pop-bumpers, kickers)
    • Lamps (in playfield and lightbox)
  • Nearly everything on the playboard uses it
  • It is controlled directly by the MPU via logic level voltages
driver board11
Driver Board
  • Needs and Complications:
  • Needs to step up from 3.3-5v DC to 6 or 24v rectified AC
  • Make sure the flipper transistors used can handle up to 8 amps each
  • Need to control around 15-20 different lamp circuits
  • The pop-bumpers and kickout solenoids each need up to 3 amps.
driver board12
Driver Board

Logic-level input from MPU

Pull up resistors and latches

6/24V AC

Smaller BJT’s (300 mA) for the lamps

Larger BJT’s (3-8 amps) for the coils

To Solenoids

To Lamps

playfield visible
Playfield (visible)
  • A few stipulations for the upper playfield:
  • Want to keep the functionality as close to the original game as possible
  • Want it to play a bit faster than the original (incline needs to be steeper)
  • Possibly implement larger flippers
  • Need to replace all rubber, lights
  • Need to touch up paint and polish the board
playfield underneath
Playfield (underneath)
  • A few stipulations for the lower playfield:
  • All the displayed electromechanical relays are replaced by solid state via the fore-mentioned driver board
  • All aluminum wiring is removed and replaced with 18-20 gauge copper wiring
  • All contact switches are cleaned
a v controller
A/V Controller
  • Contains two separate controllers:
  • DAC:
    • Has a file select input with data fed from the MPU
    • Has internal storage of uncompressed WAVE or PCM files.
  • DVC:
    • Reads the current score and points from data register
    • Writes to individual LED panels
a v controller16
A/V Controller

Current Score

Display Controller/Decoder

-Probably an FPGA

-Could also be a ROM

-Can display customs graphics

Score Display

Points Display

LED Bar Graph

Play Select

Audio Controller

-Several sound bits stored in

flash memory

-A programmable ROM

selects the correct track

-D/A converter outputs RCA

Speaker System

  • Since this is a restoration, try to keep the scoreboard looking the same:
  • Replace analog score and point tumblers with individual dot-matrix digital displays
  • Replace mechanical football wheel with LED bar graph
  • Use analog lamps for “ball in play” section
  • Two 4 inch car speakers
  • Powered subwoofer
  • Run off of A/V controller
  • Speaker receives line level signal from A/V controller



division of labor
Division of Labor
  • Aaron: Driver Board, Power Supply, MPU, Display, A/V controller, RAM
  • Brian: MPU board, A/V controller, Flash Memory, RAM, Line Bus (controllers), EPROM
  • Ryan: MPU, EPROM, Flash Memory, RAM, Display, Driver Board, Power Supply
  • All: Playfield - wiring, refurbishing, testing
risks and contingency plan
Risks and Contingency Plan
  • A/V controller:
    • Implement set of beeps and bells for audio and toned down preprogrammed display art.
  • Cosmetic restoration
  • User Options
    • 3 or 5 ball play
    • #coins / credit
    • Free play
    • Multi-ball

Ask them meow!