Space Fortress (CVS)
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Display
Type: raster Vertical
Resolution: 240 x 248
Refresh: 50 Hz
Processors
Signetics 2650 @ 1.79 MHz
2x Signetics 2650 @ 894.9 kHz
Audio
Signetics 2636 PVI
Signetics 2636 PVI
Signetics 2636 PVI
8-Bit R-2R DAC
4-Bit R-2R DAC
Beep @ 0.6 kHz
Beep @ 0.1 kHz
Beep
TMS5100 @ 620 kHz
Channels: 1
Controls
Players: 2
Coin slots: 2
joy, 2-way, 2 buttons
joy, 2-way, 2 buttons
Components (from manual)
2K4003 IC1 · Microprocessor in main circuit
2K4005 IC2 · Support IC
74LS139 IC3 · Decoder
74LS174 IC4 · Hex D flip-flop
LM324 Quad op-amp in DAC converter section
2N3904 NPN transistor used in multiple locations
2N3906 PNP transistor used in multiple locations
LM324 Quad op-amp
LM358 Dual op-amp
74LS00 Quad NAND gate
74LS04 Hex inverter
74LS08 Quad AND gate
74LS74 Dual D flip-flop
74LS86 Quad XOR gate
74LS138 3-to-8 decoder
74LS244 Octal buffer
74LS273 Octal D flip-flop
PCBs (from manual)
DAC Converter
Digital to analog converter board for video output
Digital to analog converter board for video output
MT8V2
Main board section
Main board section
MT8V1
Secondary board section
Secondary board section
MT8V3
Lower board section
Lower board section
Fuses (from manual)
F1 3A
F2 1A
DIP Switch Settings
Data from MAME. On later hardware, game settings are typically in the Test/Service Menu, not DIP switches. Learn more
Physical switch positions not available for this machine in MAME. Check the service manual below for DIP switch details.
| Setting | Options | Default |
|---|---|---|
| Coin A | 4 Coins/1 Credit3 Coins/1 Credit2 Coins/1 Credit1 Coin/1 Credit ✱ | 1 Coin/1 Credit |
| Coin B | 1 Coin/2 Credits ✱1 Coin/3 Credits1 Coin/4 Credits1 Coin/5 Credits | 1 Coin/2 Credits |
| Lives | 3 ✱5 | 3 |
| Unused | Off ✱On | Off |
| Unused | Off ✱On | Off |
| Unused | Off ✱On | Off |
| Bonus Life | 100k only ✱150k only200k onlyNone | 100k only |
| Cabinet | Upright ✱Cocktail | Upright |
| Unused | Off ✱On | Off |