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