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Document Title: [Space_Zap.txt (text file)]

Space Zap Midway, 1981
---------------------- 
 
The "Position on Motherboard" column refers to the fact that these boards
plug into a common motherboard much like ISA/EISA/VESA/PCI cards plug into
PC card expansion slots.
 
Legend:
PS = Power Supply
IB = RGB Interface Board
AA = Audio Amp Board
GB = Game Board
 
 
Motherboard (9-pos, 0.156") (outputs & inputs from power supply)
Pin | Definition
------------------
  1 | +5V
  2 | +5V
  3 | +12V
  4 | !Reset
  5 | -5V
  6 | Key
  7 | Gnd
  8 | Gnd
  9 | -Sense (Gnd)
 
P1 Game Board (13-pos, 0.100")
Pin | Definition
------------------
  1 | P2 Down
  2 | P2 Up
  3 | P2 Right
  4 | P2 Left
  5 | P2 Fire
  6 | Key
  7 | Gnd (P2 common return)
  8 | P1 Up
  9 | P1 Down
 10 | P1 Left
 11 | P1 Right
 12 | P1 Fire
 13 | Gnd (P1 common return)
 
 
P2 Game Board (16-pos, 0.100")
Pin | Definition
------------------
  1 | Coin #1
  2 | Coin #2
  3 | Test [to AA-1]
  4 | Door Slam
  5 | 1P Select
  6 | 2P Select
  7 | Gnd (common return for pins 1,2,4,5,6)
  8 | Audio [to AA-6]
  9 | Audio Common [from AA-2]
 10 | Coin Meter #1
 11 | Gnd [to PS]
 12 | Coin Meter #2
 13 | Gnd [to PS]
 14 | Key
 15 | Video Signal [to monitor]
 16 | Video Signal Gnd [from monitor]
 
 
Audio Amp Board (11-pos, 0.100"?)
(to & from Game Board)
Pin | Definition
------------------
  1 | Test (Test/Play SW1 located on Audio Amp Board) [to GB/J2-3]
  2 | Audio Common (common return from speakers)
  3 | Key
  4 | Audio In #2
  5 | V Audio (~13V) [from PS-1]
  6 | Audio In #1 [from GB/J2-8]
  7 | V Audio Return [to PS-11]
  8 | Speaker #1 [to Speaker]
  9 | Speaker #1 [from Speaker]
 10 | Speaker #2
 11 | Speaker #2
 
Notes:
1) For mono output, only 1 speaker output used
2) For dual-mono output, both speakers used and jumper JU1
3) For stereo output, both speakers used and no jumper on JU1
 
Power Supply (19-pos?)
1   +V Audio (~13V @ 1.5A)
2   -5V @ 0.45A
3   +V Independent [~10V @ 3.5A, to coin door and control lights?]
4   !Reset
5   V.Batt?
6   Key
7   +12V @ 1.45A
8   +12V @ 1.45A
9   -Sense
10  AC Sync?
11  -V Independent [Gnd, control lights return?]
12  -V Audio [Gnd for Audio circuit]
13  Gnd
14  Gnd
15  Gnd
16  Gnd
17  Coin Counter Drivers (~8V, unreg +5V) [from coin meter]
18  +5V @ 3A
19  +5V @ 2A regulated for logic
 
 
                    Strapping Chart
                    ===============
|-------------------------------------------------|
|             |JU1|JU2|JU3|JU4|JU5|JU6|JU7|JU8|JU9|
|-------------------------------------------------|
| Single +5V  |   |   |   |   |   |   |   |   |   |
| 2716 EPROM  | X |   |   | X |   | X |   | X |   |
|-------------+---+---+---+---+---+---+---+---+---|
| 2316E ROM   |   | X |   | X |   | X |   | X |   |
|-------------+---+---+---+---+---+---+---+---+---|
| 2332 ROM    |   | X |   |   | X |   | X | X |   |
|-------------+---+---+---+---+---+---+---+---+---|
| 2364 ROM    |   |   | X |   | X |   | X |   | X |
|-------------------------------------------------|
 
|--------------------------------------|
|                         | JU10 | JU11|
|--------------------------------------|
| Upright Cabinet         |  X   |     |
|-------------------------+------+-----|
| Cocktail                |      |  X  |
|--------------------------------------|
 
|--------------------------------------|
|                         | JU12 | JU13|
|--------------------------------------|
| U8,U9,U10 are 74LS08    |  X   |     |
|-------------------------+------+-----|
| U8,U9,U10 are 74LS32    |      |  X  |
|--------------------------------------|
 
The strapping chart above, I think, serves one of two purposes (or some
combination of these): 1) lets you identify certain properties of the
Game Board, or 2) allows you to change the properties of the Game
Board.
 
 
RAM-ROM Test
============
Placing the Test Switch (located on the Audio Amplifier assembly in the
coin box area) to "ON" performs the following functions:
   (1) Removes all accumulated credits
   (2) Tests the screen RAM
   (3) Tests the static RAM
   (4) Tests the game ROMs/EPROMs
   (5) Repeats all tests indefinitely
 
Placing the Test Switch in the "OFF" position returns the game to normal
operation after completion of the ROM test.  If you were to turn the test
switch off during the screen RAM test, it would take approximately 15
seconds before the game woule re-appear.
 
The game does a modified for of RAM test upon power-up or whenever the
door slam switch is activated.  If an error is found, the program
continues the test until the error is cleared.  Therefore, it is possible
that the game will never start and/or there may be no indication of
anything on the screen if there is a RAM error.
 
Error Indications
-----------------
If all RAMs and ROMs are good, the only indication will be an occasional
flash on the screen (approximately every 16 seconds).  This indicates that
it has passed all tests and is starting the test sequence over again.
 
If an error is found in the screen RAM, you will see the flash on the
screen followed by flashing random horizontal bars.  It will then cycle
through the test again until the error is cleared.
 
If an error is found in the static RAM, there will be short bursts of
flashing horizontal bars displayed on the screen.  It will then cycle
through the screen RAM test and the static RAM test again until the error
is cleared.  The cycle time is approximately 3 seconds.
 
A bad ROM or EPROM is indicated by a number "1" through "8" displayed on
the screen.  If more than one ROM or EPROM is bad, both numbers will appear
on the screen.
 
   Number Displayed   Bad ROM/EPROM in Socket
   ----------------   -----------------------
     (If you have eight 2k ROMs/EPROMs)
          1                     X1
          2                     X2
          3                     X3
          4                     X4
          5                     X5
          6                     X6
          7                     X7
          8                     X8
     (If you have four 4k ROMs/EPROMs)
          1                     X1
          2                     X1
          3                     X3
          4                     X3
          5                     X5
          6                     X5
          7                     X7
          8                     X7
 


}