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JUMPER COMBINATIONS for STERN MPUs

From 1977 until 1984, Stern used only two circuit boards as the main processor unit (or MPU board) in every model of their pinballs. From 1977 through 1979, this board is designated the MPU-100 or 'early' board. All of these early games used a U2 & a U6 as GAME ROMS. The following games were shipped from the factory with early MPU boards:

These games can be made to run on any Stern or Bally MPU board, early or late.


Beginning in 1979, Stern expanded the capability of their MPU board and introduced the MPU-200 or 'late' MPU board. This board looks very much like the MPU-100, except that it has an additional 5101 RAM chip added at the bottom of the board. The MPU-200 board is capable of running every STERN game AND every BALLY game of that era, early and late.The following list shows the STERN 200 series games. These games all used 4 GAME ROMS labeld U1, U2, U5 and U6. THESE GAMES WILL ONLY RUN ON THE MPU-200 BOARD! THEY CANNOT BE MADE TO RUN on the early MPU board!

(This list is in alphabetical order):


Both the early and the late MPU boards use JUMPER wires which can be moved to change the way that the processor chip addresses the information contained in the ROM chips. These READ-ONLY-MEMORY chips contain the maps of the playfield and the switch matrix, the layout of the solenoid coils, as well as the 'rules of the game'. When these games were first produced, it was cost effective to have the ROMs produced in large numbers with the program imprinted permanently on the chip. These devices, called MASKED ROMS, can not be erased or re-programmed. They require a particular JUMPER combination to run. If any one of the jumpers is missing or misplaced, the board simply will not work. To confuse matters, it is now possible to purchase replacement ROMs on EPROM, or ERASABLE-PROGRAMMABLE-READ-ONLY-MEMORY. The only difference between the MASKED ROM and the EPROM is the ADDRESSING neccessary for the computer to read the chip. Therefore, it becomes neccessary to change the JUMPERS when changing chips, whether you are putting a different game on a particular board, or simply replacing failed original chips. The folowing JUMPER CHART explains how to get any particular device to run in any given MPU board. Note: Stern ROMs labeled "25A-ROMP#" are 9316A masked ROMs. Chips with a 'window' on top are 2716 EPROMs. Both chips contain the same program, but they are selected differently, requiring that the proper 'jumpers' be connected on the MPU board to match the device type.



STERN 'LATE' MPU-200:

Some interesting and little-known facts about the MPU-200:

If you power-up an MPU-200 with all 32 dip switches turned off (Open), it will flash 7 times and jump into self-test.To down-grade the MPU-200 to act like an MPU-100, remove jumpers 32-33 and 34-35 and pull the upper 5101.The MPU-200, when jumpered for 4 2716 EPROMS (U1, 2, 5 & 6), will run Bally (3) 2716 (U1, 2 & 6) games. To run Bally (2) 2716 games (U2 & U6), change 13-14 to 13-15 and change 5-7 to 1-5.


Pinball ROMs

Part number Description price comments location Open a picture
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BUY it NOW!
ROMProgrammed GAME ROM from our archives
$25. for any one chip
These are the 'personality chips' which contain the GAME PROGRAM
YOU NAME THE GAME!

Available for MPU boards, sound boards, displays, ANYWHERE a programmable device was used in your game:

WE KEPT A COPY FOR YOU IN OUR ARCHIVES!

ROMs
RM2Programmed GAME ROMs from our archives
$45. for two from the same game
set of 2
YOU NAME THE GAME!
ROMs
RM3Programmed GAME ROMs from our archives
$60. for three from the same game
set of 3
YOU NAME THE GAME!
ROMs
RM4Programmed GAME ROMs from our archives
$70. for four from the same game
set of 4
YOU NAME THE GAME!
ROMs
RM5Programmed GAME ROMs from our archives
$80. for five from the same game
set of 5
YOU NAME THE GAME!
ROMs

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