About Ultimarc

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Ultimarc or (Ultimate Arcade Controls), Home of the J-Pac interface and Arcade VGA card that were used in my M.A.M.E cab project.

The J-Pac

The J-PAC has most of the inputs connected to it via an integral JAMMA edge connector and makes it easy to connect a standard JAMMA pre-wired cabinet by simply plugging the cabinet connector onto the board. The J-PAC also contains video circuitry for connecting the PC to the cabinet arcade monitor.

Besides amplifying the video level, the on-board video circuitry also synthesises composite sync from separate H-V sync from the VGA card. The J-PAC has a jumper which is set to the frequency that the monitor is designed for (most commonly 15Khz). The J-PAC will not pass the sync signal through unless it detects the signal is at the correct frequency for the monitor. Some older types of 15Khz monitor could be damaged if fed with a high sync rate. The J-PAC prevents this happening. If the sync rate is not in range, the monitor is still powered up and still has video passed to it but no damage can occur as the horizontal frequency cannot be driven too fast without any sync present. IMPORTANT: It is not a scan converter so you will have to configure the VGA card to send the correct sync rate for the monitor OR you can use our ArcadeVGA card which will drive a 15Khz monitor with no special configuration.

The Arcade VGA card

The Ultimate Video card for 15Khz Arcade Monitors
Connect your 15Khz arcade cabinet monitor to your PC with NO special configuration or special driver software in either DOS or Windows.

•   Displays all boot, DOS and Windows screens. Displays Windows desktop in a choice of resolutions including interlaced and non-interlaced.
  
•   Allows DOS MAME or MAME32 to run almost all games at their native resolutions without hardware stretching, scan converters or other degradation.
  
•   Emulates the original game board's graphics hardware as closer than has ever been possible before.
  
•   Contains 28 built-in 15Khz video graphics modes tailored specially for emulation.
  
•   All 240-line modes have an exact 60Hz vertical refresh rate for best performance in scrolling games.
  
•   Special 300 X 256 Mode timed at 53Hz vertical for games such as Mortal Kombat .
  
•   All video modes timed at 15.7 Khz horizontal frequency to eliminate picture shifting on mode changes.
  
•   Also contains all standard VGA graphics and text modes, running at 15Khz. Text screens display the full 25 lines without interlace using a special reduced-height font.
  
•   All special modes available in Windows XP, Windows 2000 and Windows 98 at all colour depths.
  
•   Desktop rotation supported in Windows for vertically-mounted monitors in Windows XP and 2000.
  
•   Choice of Windows desktop resolutions including interlaced and non-interlaced modes. Can be assigned hot-keys .
  
•   Virtual-desktop mode supported in XP and 2000, so you can run a desktop of 1024 X 768 and auto-pan.
  
•   No MAME monitor configuration necessary, no need even to tell MAME you have an arcade monitor.
  
•   Run any Windows application which can use 640X480 or 800X600 on your arcade monitor including 3D games.
  
•   All modes locked with vertical and horizontal negative sync for easy connection via a direct cable.
  
•   Choice of available connection methods, Via J-PAC, Via Video Amp, or Direct Cable connect.
  
•   Powerful ATI Radeon 9200 chipset for great performance in 3D games as well as emulation