Description
BS-285 MPU
This board is compatible with Bally MPU (AS-2518-17, AS-2518-35 and AS-2518-133) built between 1978 and 1985, the Stern MPU (M-100) built between 1978 and 1982, and also some Bell Games.
It uses classical IC components with no-proprietary chips.
The board remains very faithful to the original one. Obsolete or fragile components have been replaced by more reliable components while keeping the same behaviour. There is no emulation or proprietary component, this board can be repaired in the same way as the original one.
Main Features:
Unique eprom
It has one unique Game ROM that includes all Bally and Stern (and also some Bell Games).
Freeplay version for Bally is also included.
This board is still compatible with a 2764 ROM (dedicated Game ROM)
Voltage LED indicators
3 LED indicator show if the different Voltages (5V, 12V and 40V) are possible.
When the 40V LED indicator is OFF, the seventh flash will be missing and the game won’t start.
When the 12V LED indicator is ON and the 5V LED indicator is OFF, this shows a problem with 5V Regulator
Reset
The reset circuit is reduced to only one component.
Clock
The board uses the 6802 CPU with a quartz.
The 6810 RAM and the obsolete 9602 IC are useless.
Battery
The board uses either a CR2450 battery or a 1F Capacitor
Clear Memory
A special game program (Clear Memory) has been written in order to clear the Memory.
Credit, Coin and Test buttons
The board includes a Credit, two Coin and a Test push buttons.
This is very handy when you have doubts about the J3 connector or the coin doors cabling.
More realiable RAM
The fragile and hard to find 5101 sRAM has been replaced by a 6264 sRAM.
Compatible Games
Bally
$6 MILLION MAN
BABY PAC-MAN
BLACK JACK
BLACK PYRAMID
BMX
CENTAUR
CYBERNAUT
DOLLY PARTON
EIGHT BALL
EIGHT BALL DELUXE
ELEKTRA
EMBRYON
EVEL KNIEVEL
FATHOM
FIREBALL CLASSIC
FIREBALL II
FLASH GORDON
FREEDOM
FRONTIER
FUTURE SPA
GOLD BALL
GRAND SLAM
GRANNY GATORS
HARLEM GLOBETROTTERS
HOT DOGGIN’
KINGS OF STEEL
KISS
LOST WORLD
MATA HARI
MEDUSA
MONROE BOWL
MR & MRS PACMAN
MYSTIC
NIGHT RIDER
NITRO GROUNDSHAKER
PARAGON
PLAYBOY
POWER PLAY
RAPID FIRE
ROLLING STONES
SILVERBALLMANIA
SKATEBALL
SPACE INVADERS
SPEAKEASY
SPECTRUM
SPY HUNTER
STAR TREK
STRIKES & SPARES
SUPERSONIC
VECTOR
VIKING
VOLTAN
XENON
X’s & O’s
Stern 100
DRACULA
HOT HAND
LECTRONAMO
MAGIC
MEMORY LANE
NUGENT
PINBALL
STARS
STINGRAY
TRIDENT
WILDFYRE
Bell Games
Cosmic Flash
New Wave
Saturn 2
Space Hawks
Super Bowl
Tiger Rag
World Defender
