PARSEC Supergun v1.1 Instructions
Thank you for purchasing the Parsec Supergun.  It has been designed to offer high compatibility as well as good picture and sound quality.  The Parsec is safe to use with vintage arcade circuit boards, RGB video converters such as the XRGB mini and OSSC, and TVs / monitors.
POWER
The Parsec is merely a pass through connector for powering your arcade game PCB.  It is important to use a good quality power supply with ATX compatible connector.  Arcade power supplies can also be used by adding a jumper (fig. 2)  Most JAMMA arcade games use 3 - 10 amps at +5v. 
The yellow "STANDBY" led indicates the connected ATX compatible power supply is switched on and the arcade game may be powered up by pressing the push button near the coin & test buttons.  
It is strongly recommended to use a multimeter and take voltage measurements of the incoming +5v and +12v before and after connecting your JAMMA arcade game PCB.  There are labeled pins on the Parsec (near the ATX connector) for easy voltage measurment.  Measurement range listed below:
+5v measurement  =  5.0v - 5.15v
+12v measurement = 12.0v - 12.2v
CAUTION:  If voltages are higher than listed, damage could occur to a connected arcade game PCB.  If the +5v input is higher than 6v the Parsec will be damaged.  Immediately power down the system and locate the cause if the voltages are higher or lower than above specification.
The on-board -5v regulator is powered from the +12v supply and turned on/off by the large slide switch near the ATX connector.  This switch should be left in the "ON" position unless a particular JAMMA PCB is known to not require -5v, such as Neo Geo MVS.  Games requiring -5v but not receiving it will not produce audio or work at all.  On board LEDs indicate voltage present. Red = +5v,  Green = -5v,  Blue = +12v
VIDEO
Parsec has a built-in NTSC video converter with 75 ohm video driver  that provides composite, s-video, and RGB output.  For best video quality, use S-Video or RGB video outputs.
Parsec is compatible with all Genesis 2 A/V output cables.  A correctly wired RGB SCART cable will have 220uF capacitors and 75 ohm resistors in-line with the red, green, and blue wires.
A 10 pin header receptacle is provided for connection to a hat PCB to provide additional video output connections.  The "expanded RGB" hat has and XRGB mini compatible 8 pin mini din connector as well as a VGA connector for additional RGB output options.  This hat allows 2 different sync modes:  Mode 1 is the normal composite sync from the NTSC converter.  Sync mode 2 provides separate composite sync and vertical sync to the VGA connector from LM1881 sync cleaner.
AUDIO
Audio output is provided through either a 1/8" stereo line out jack or the Genesis 2 A/V connector.  The Genesis 2 audio is disabled when a cord is plugged into the "AUDIO LINE OUT"  jack.  Stereo sound is only supported on compatible Neo Geo boards.
Note: The "AUDIO LINE OUT" connector is not designed for headphones.
Leave the "STEREO/MONO" switch in "MONO" position unless using a compatible Neo Geo MVS.
Parsec has an isolated audio ground feature to eliminate interference from the main system ground.  The "AUDIO GND" switch is located between the composite video connector and audio output jack.  This switch must be in the "GND" position to use the Genesis 2 A/V connector for sound.  To use isolated grounding, plug an audio cable into the 1/8" "AUDIO LINE OUT" connector and move the "AUDIO GND" switch to the "ISO" position.
CONTROLS / KICK HARNESS
Parsec has two Neo Geo compatible controller ports for players 1 & 2.  In order to use Parsec with 6 button games, a correctly wired kick harness and compatible controller are required.  Refer to the partial wiring diagram on page 4 with the controller port wiring for each player.
A connector is included that can be soldered to a specific game's kick harness.  If additional connectors are needed, they are 0.1" (2.54mm) pitch molex 6 pin, Digikey part # WM3237-ND.   Standard Neo Geo controllers can only access buttons 1-4; if using the alternate mapping they can utilize buttons 1-5.
Credit and button 5 inputs can be swapped by using the "J1" jumper pins (figure 1.) Standard mapping has the insert coin input assigned to the select button on a standard Neo Geo controller.  Installing the jumpers in the "alternate" position will swap the button 5 and insert coin inputs for each player.

The four DIP switches connect / disconnect button inputs 4 and 5 from the JAMMA connector.  These switches can be left off for most games.  For Neo Geo MVS, switch these on.

JAMMA ARCADE GAME CONNECTION
CAUTION:  Check all connections and switch positions before powering on the PARSEC.
The actual JAMMA arcade game PCB should be connected last.  If the height of the two JAMMA connectors is off, use a spacer (such as a dvd case) to raise up the Parsec PCB to the same height as the arcade game.  When plugging in your JAMMA arcade PCB, use care to make sure the pins are properly aligned and fully inserted straight into the connector.  When unplugging the arcade PCB, use your thumbs on both sides of the connector and apply equal pressure to remove the Parsec straight out.
USER MODIFICATIONS  (experts only)
It is possible to modify the Parsec's video and audio output through the use of the on board jumper points.  For example, the 3 exposed traces on the video mod jumper (fig. 3) can be cut and a 1k potentieometer may be wired in series with the red, green, and blue signals for individual level adjustment.
CAUTION: if using the on-board -5v regulator, DO NOT connect the -5v jumper in fig. 2.

COMPATIBILITY
While the Parsec was designed for compatibility with the majority of the 1,000s of available JAMMA arcade games, it may not work with every game. Some JAMMA arcade games with non-standard RGB signals will not display a picture using s-video or composite video.