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 Relays and solenoids controlling game play Relays and solenoids controlling scoring

Inspiration 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.

Outline Micro-Controller and Board Driver/Step-up Board Playfield Interaction A/V Controller Display Audio

Overview User Input Micro-controller Driver Board Playfield A/V Controller Display Power Supply 6 Vac 5 V DC 25 Vac

User Input Two Flipper Buttons Start Coin or Manual Operation MC Quad SR Latch – De-bouncing RFLFSB MC CR 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-Controller MC68HC11 EPROM RAM Sensory Input Driver Board Game Option Switches A/V Controller

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 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 different lamp circuits The pop-bumpers and kickout solenoids each need up to 3 amps.

Driver Board Larger BJTs (3-8 amps) for the coils Smaller BJTs (300 mA) for the lamps Pull up resistors and latches Logic-level input from MPU To SolenoidsTo Lamps 6/24V AC

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) 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 gauge copper wiring All contact switches are cleaned

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 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

Display 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

Audio Two 4 inch car speakers Powered subwoofer Run off of A/V controller Speaker receives line level signal from A/V controller A/V Controller

Schedule

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 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? Ask them meow!