Car RamRodBringing Pinball Into the Future!

Brian Arment, Ryan Hunter, Aaron Shoaf

Williams® TouchdownWilliams® Touchdown

• Originally Produced November of 1967

• Electromechanical

• Solenoid and relay driven

• No solid-state devices

• Not in working order

Original InternalsOriginal Internals

Relays and solenoids controlling game play

Relays and solenoids controlling scoring

InspirationInspiration

• 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.

OutlineOutline

• Micro-Controller and Board

• Driver/Step-up Board

• Playfield Interaction

• A/V Controller

• Display

• Audio

Overview

User Input

Micro-controller Driver Board

Playfield

A/VController

Display

Power Supply

6 Vac

5 VDC

25 Vac

User InputUser Input• Two Flipper Buttons

• Start

Coin or Manual Operation

• MC 14043 Quad SR Latch – De-bouncing

RF LFSB

MC 14043

CR

4 line bus to MCU

Micro-ControllerMicro-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-ControllerMicro-Controller

MC68HC11

EPROM

RAM

SensoryInput

Driver Board

Game Option Switches

A/V Controller

Driver BoardDriver 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 BoardDriver 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 BoardDriver Board

Larger BJT’s (3-8 amps) for the coils

Smaller BJT’s (300 mA) for the lamps

Pull up resistors and latches

Logic-level input from MPU

To Solenoids To Lamps

6/24V AC

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 ControllerA/V ControllerContains 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 ControllerA/V Controller

Display Controller/Decoder -Probably an FPGA -Could also be a ROM -Can display customs graphics

Current Score

Score Display

Points Display

LED Bar Graph

Audio Controller -Several sound bits stored in flash memory -A programmable ROM selects the correct track -D/A converter outputs RCA

Play Select

Speaker System

DisplayDisplaySince 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

AudioAudio

• Two 4 inch car speakers

• Powered subwoofer

• Run off of A/V controller

• Speaker receives line level signal from A/V controller

A/VController

ScheduleSchedule

Division of LaborDivision 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

Questions?Questions?

Ask them meow!