[Feb/25/98]


Game Name     Chip type   Position  Revision  Checksum  Notes
*----------------------------------------------------------------
Springer
               2732         3K                  0BD8    CPU OVG-51D Blank start.
               2732         3L                  5FD7    CPU OVG-51D
               2732         3N                  0DB8    CPU OVG-51D
               2732         3P                  9F72    CPU OVG-51D
               2732         3R                  774A    CPU OVG-51D
               2732         5C                  FD39    Video Board
               2732         5D                  331E    Video Board
               2732         6F                  B31B    Video Board
               2732         6K                  E179    Video Board
               MB7052       1C                  0169    Color Prom (read as 82S1
               MB7052       1B                  0120    Color Prom (read as 82S1





BOARD ID

2 boards, top board containing a custom CPU (Z80 derivative in a silver metal
case 3 by 4 inches) & AY-3-8910 measures 5.5 inches by 11.5 inches.  Bottom
board is 9 inches by 11.5 inches and connects to the top viva a 50 wire
ribbon cable.  The boards were  manufactered by ORCA with the logo  picture
of Orca the killer whale  - OVG-51D on the top board & OVG-54D on the bottom.
The Eproms are 2732s that have silver window label with numbers 1-9 for
relative position & the Orca name.

PINOUTS

                 Parts                       Solder

                    2P Down      1      2P Up
                                 2
                                 3
                   2P Right      4      2P Left
                                 5
                                 6
                    1P Down      7      1P Up
                                 8
                                 9
                   1P Right     10      1P Left
                                11
                                12
                                13      Coin Switch
                   2P Start     14      1P Start
                   2P Shoot     15      1P Shoot
                    +12 VDC     16      Speaker + (GND other side)
                     +5 VDC     17      +5 VDC
                     +5 VDC     18      +5 VDC
                        GND     19      GND
                        GND     20      GND
                 Video Blue     21      Video Sync
                  Video Red     22      Video Green

The security CPU module is in a tin shell about 3x4 inches which is filled with epoxy, removing the epoxy exposes a Nicad, a Z80, a 6116LP RAM, a 74LS32, a 74LS05 and a 4069 plus a few diodes & resistors.  The first ROM has a blank space and I assume that the RAM has program code stored in it to act as unaccessable ROM code.

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