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Ultimarc J-PAC Jamma To PC Arcade Controls


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New version of the Jamma USB encoder for PC: J-PAC (JAMMA encoder for Pc to Arcade Controls) from Ultimarc. 


Order it before 11:00 on Monday and receive it between Tue 18 June and Thu 20 June with UPS EXPRESS SAVER

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  • 1 year warranty 1 year warranty
  • Shipments in 24h / 48h Shipments in 24h / 48h
  • 15 day return policy 15 day return policy

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Description - Ultimarc J-PAC Jamma To PC Arcade Controls

NOTE: This encoder does NOT convert your monitor's CGA signal to VGA. You need an ArcadeVGA card so your PC can read the Arcade monitor signal at 15kHz.

New version of the J-PAC (JAMMA encoder for Pc to Arcade Controls) from Ultimarc. The J-PAC is a board that allows you to connect a PC to an Arcade Machine through a USB port or through a PS/2 port. The J-PAC board has all the advanced features of the I-PAC2 board built-in plus 1 built-in JAMMA connector.

Thanks to the J-PAC board you won't have to change or modify anything inside your arcade cabinet in case you want to connect a PC to your arcade system inside your cabinet. The J-PAC is compatible with operating systems: Windows, Linux (Raspberry Pi) and MAC OS.

This board is designed for those who want to keep the beauty and originality of their original Arcade Machine but that at the same time want the advantages connecting a PC brings to the system, as for example being able to launch different emulators of hundreds of different platforms with an infinite number of retro games.

This new version of the J-PAC has fully protected connections against static discharge and reverse connection plus 3 extra JAMMA connections have been integrated in this version: Tilt, Service SW and Test. Undoubtedly a breakthrough for the user who wants to get the maximum benefit of his Arcade system. Among other new features we can enjoy 100% compatibility with 12V coin-operated Mechanisms. / Coin Doors.

When we connect the J-PAC for the first time we will notice that it is recognized as a keyboard, since this board emulates a USB keyboard. However, with the J-PAC we will not have the problem that USB keyboards have of not being able to press more than 6 keys at the same time. Nor will we have the problem called "Ghost Keys" (that occurs when pressing the same key repeatedly). This is thanks to the fact that the JPAC has built-in full native USB support, and does not rely on any additional adapters.

One of the most popular features of the I-PAC2, A-PAC and J-PAC board is the SHIFT function. With this function you will be able to assign any input as a shift key and access a set of alternate action keys thus doubling the number of input connections. 

Another great advantage of this encoder is that it has no LAG thanks to the fact that each action key / button input has its own dedicated connection that goes directly to the CPU of the PCB. We will execute Kicks, jumps, combos and other actions without any effort whatsoever.


The action keys of the MAME emulator are assigned by default in the JPAC, although it is not mandatory to use them and these can be reprogrammed freely to the user's taste. Here's an instruction manual where we go in depth into the different possibilities offered by this wonderful board In addition you can also check several links with direct downloads to various very useful programs that will help you configure the J-PAC. 

Instruction Manual

Configuration Programs

Windows / WinIpac

Linux / Raspberry Pi

MAC / Modern Intel MAC versions

MAC / Older PowerPC versions

Normal multi-mode

Mixed Multi-mode


  • NEW VERSION! Inputs protected against static discharge
  • Supports 3 extra JAMMA connections (Tilt, Service SW and Test)
  • Now supports 12 volt coin doors
  • Fully programmable key code set. Stored even after power off
  • Dual encoder USB or Keyboard
  • Supports I-PAC optional pre-assembled LED harness
  • Lead connections into keyboard socket on PC or USB port
  • Self-Test LED 
  • No separate power needed
  • No ghost keys
  • Shift functions
  • Plug & Play
  • Connector for VGA input from PC VGA card
  • On-board video amplifier boost signal 
  • Custom microcontroller for sync signals
  • JAMMA cabinet speaker routed to screw connectors 

Technical Specifications

Windows / Linux / MAC
14 x 5,2 x 1,5 cm
No. of players

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