Can DVI-D Accept 15 kHz Analog RGB Arcade Signals?

A DVI-D input cannot accept 15 kHz analog RGB signals from retro arcade boards under any circumstances. DVI-D is a purely digital interface that lacks the physical pins and internal hardware required to process analog video. Furthermore, standard arcade video operates at a low horizontal frequency of roughly 15.7 kHz, which modern digital displays cannot decode without active upscaling or line-doubling hardware.

The Physical and Electrical Incompatibility of DVI-D

The primary barrier to connecting an arcade board directly to a DVI-D port is the signal format. The "D" in DVI-D stands for "Digital."

  • Missing Analog Pins: While DVI-A (analog) and DVI-I (integrated digital and analog) include four analog pins surrounding a flat ground blade on the side of the connector, DVI-D omits these pins entirely. There is no physical pathway for analog Red, Green, Blue, or sync signals to enter a DVI-D port.
  • Passive Adapters Do Not Work: Passive adapters or breakout cables (such as VGA-to-DVI) are built for DVI-I ports. These adapters will either physically fail to plug into a DVI-D socket due to the pin layout, or if the adapter lacks the analog pins, it simply will not transmit the analog video signal to the monitor.

The 15 kHz Frequency Barrier

Even if a monitor features a DVI-I port that accepts analog signals, classic arcade hardware presents a second fundamental issue: horizontal scan rates.

  • Arcade Output: Most classic arcade systems (JAMMA standard) output standard-definition RGB (typically 240p or 480i) with a horizontal scan rate of approximately 15.7 kHz.
  • PC Monitor Standards: Computer monitors and standard flat-panel displays designed around DVI/VGA standards require a minimum horizontal frequency of 31.5 kHz (equivalent to 480p resolution). If a 15 kHz analog signal is passed to a non-compatible display, the screen will display an "Out of Range" or "No Signal" error.

Voltage Level Differences

Retro arcade hardware outputs video signals at a significantly higher voltage than consumer video equipment.

  • Arcade RGB: Typically outputs unattenuated signals ranging from 2.0V to 5.0V peak-to-peak.
  • Standard Consumer Video: Standard analog RGB/VGA inputs expect 0.7V peak-to-peak terminated into 75 ohms.

Connecting raw arcade video signals directly to standard consumer display inputs without proper attenuation resistors can overdrive the receiver circuitry and cause permanent damage to the monitor or converter.

How to Connect 15 kHz Arcade RGB to a DVI-D Display

To display a 15 kHz arcade signal on a DVI-D monitor, you must use an active converter, digitizer, or line doubler. The device must perform three distinct tasks:

  1. Signal Level Adjustment: Step down the high-voltage arcade RGB signal to standard consumer levels.
  2. Line Doubling / Scaling: Digitize the 15.7 kHz analog video and double the scan rate to at least 31.5 kHz (converting 240p to 480p or higher).
  3. Format Encoding: Output the processed video as a digital TMDS signal compatible with DVI-D or HDMI (which can connect to DVI-D via a simple passive adapter).

Common solutions designed for this purpose include specialized arcade-to-digital converters such as the Open Source Scan Converter (OSSC), RetroTINK series, and custom GBS-Control units. These devices accept the analog RGB and sync signals directly from an arcade supergun or JAMMA harness and produce a clean, low-latency digital signal that modern DVI-D inputs can display.