Reflex Prism - Digital Video to Analog Video Converter
This item is currently sold out. Get notified when it's back!
Pre-order units due in mid-February. Cases have arrived, now waiting on PCBs.
Features:
- Lag free 1:1 digital video to RGB, YPbPr, and S-Video conversion - no resolution (upscale/downscale), or crop/aspect ratio changes from input to output.
-
Reference quality dual, simultaneous video output (Mini-Din 10 simultaneous output requires special devices)
- HD15 (VGA) port:
- RGB or YPbPr (controlled by switch)
- Up to 1920x1200 (matches digital video resolution)
- Use this to convert 240p-1200p digital video to analog video for a high resolution monitor, PC CRT, etc.
- Mini-Din 10) (Sega Saturn) Port:
- RGB and S-video simultaneously
- Composite video is present, but not supported due to dot crawl
-
240p/480i only (~240p/15kHz HDMI special resolution required)
- Supported by MiSTer, but not modern PCs, consoles, etc.
- Most HDMI devices output separate sync (HV) and a minimum of 480p/31kHz so they won’t work with the Mini-Din 10 port.
- Pre-order Prisms will have an internal pin jumper to combine HV sync to composite sync. This should enable support for GCVideo and Raspberry Pi 240p output
- HD15 (VGA) port:
-
HiFi audio output
- Buffered stereo audio for independent/simultaneous 3.5mm and Mini-Din 10 audio output.
- The first batch of Prism requires a slim-profile 3.5mm audio cable with recessed outer jacket to clear the enclosure wall.
-
-
- This is the recommended audio cable (affiliate link): https://amzn.to/3Xk5ngt
-
Includes:
- Reflex Volt unit
- Due to improvements in the power filtering circuit, a specific power supply is no longer needed and isn't included, nor is a USB cable. Use pretty much any 5V USB power supply and cable.
Configuration:
-
MiSTer FPGA MiSTer.ini 240p/480i configuration:
-
direct_video=1
- direct_video=2 for MiSTer updates beyond 11/9/2025 will automatically work with HDMI displays or Prism without changing direct_video settings
-
vga_mode=rgb
- Prism requires RGB video as the input format. It converts from RGB to YPbPr, and S-Video.
- composite_sync=1
-
direct_video=1
-
MiSTer FPGA MiSTer.ini 480p+ configuration:
- direct_video=0
- vga_mode=rgb
- composite_sync=0 for PC CRTs that don’t support composite sync.
- video_mode=____
Officially Supported Resolutions (not including custom resolutions):
Tested Devices:
Geometry or aspect ratio adjustments may be required. No guarantee of compatibility with all of these devices as firmware is always subject to change.
-
Consumer CRTs and PVMs
-
MiSTer FPGA (RGB/YPbPr and RGB + S-Video)
- Groovy MiSTer
-
MiSTer FPGA (RGB/YPbPr and RGB + S-Video)
-
PC CRT / HDTV VGA
- MiSTer FPGA (Analog IO board to consumer CRTs + Prism to PC CRT)
- PC
- SteamDeck
- Mac mini
- GCVideo to RGB (note: regenerate csync in GCVideo might not work for YPbPr)
- Wii2HDMI
- Wii U
- Switch
- Switch 2
- PS3
- PS5
- Xbox Series X
- Dreamcast HDMI
- MiSTer FPGA (Analog IO board to consumer CRTs + Prism to PC CRT)
Peripherals:
- HD15 (VGA) to YPbPr cable
- HD15 (VGA) to SCART cable
- Mini-Din 10 to SCART cable
- Mini-Din 10 to RCA + S-Video cable (Universal)
- Mini-Din 10 to HD15 (VGA) cable for Extron and some video upscalers (RGBS and audio only)
- Slim Profile 3.5mm to RCA Audio Cable (Amazon Affiliate)
Troubleshooting
What video formats does Prism support?
Prism expects RGB formatted HDMI video and outputs the same resolution as input. Prisms delivered in 2026 include a composite sync combination circuit.
HD15 (VGA): RGBHV or YPbPr (use slide switch to select)
Mini-DIN-10: RGBs and S-Video
Does Prism work with Analogue products?
No. Analogue products require a specific EDID signature that Prism doesn't support.
Can I connect Switch/PS5/Steam Deck to my 240p/15kHz CRT?
No, that requires a downscaler. HDMI minimum resolution is 480p. You can use Prism to connect those consoles to a PC CRT.
Why do I see dot crawl in my composite video signal?
Composite video is not officially supported. It is affected by dot crawl. There's no technical solution to improve the composite video signal.
Reflex Prism - Digital Video to Analog Video Converter
Pre-order units due in mid-February. Cases have arrived, now waiting on PCBs.
Features:
- Lag free 1:1 digital video to RGB, YPbPr, and S-Video conversion - no resolution (upscale/downscale), or crop/aspect ratio changes from input to output.
-
Reference quality dual, simultaneous video output (Mini-Din 10 simultaneous output requires special devices)
- HD15 (VGA) port:
- RGB or YPbPr (controlled by switch)
- Up to 1920x1200 (matches digital video resolution)
- Use this to convert 240p-1200p digital video to analog video for a high resolution monitor, PC CRT, etc.
- Mini-Din 10) (Sega Saturn) Port:
- RGB and S-video simultaneously
- Composite video is present, but not supported due to dot crawl
-
240p/480i only (~240p/15kHz HDMI special resolution required)
- Supported by MiSTer, but not modern PCs, consoles, etc.
- Most HDMI devices output separate sync (HV) and a minimum of 480p/31kHz so they won’t work with the Mini-Din 10 port.
- Pre-order Prisms will have an internal pin jumper to combine HV sync to composite sync. This should enable support for GCVideo and Raspberry Pi 240p output
- HD15 (VGA) port:
-
HiFi audio output
- Buffered stereo audio for independent/simultaneous 3.5mm and Mini-Din 10 audio output.
- The first batch of Prism requires a slim-profile 3.5mm audio cable with recessed outer jacket to clear the enclosure wall.
-
-
- This is the recommended audio cable (affiliate link): https://amzn.to/3Xk5ngt
-
Includes:
- Reflex Volt unit
- Due to improvements in the power filtering circuit, a specific power supply is no longer needed and isn't included, nor is a USB cable. Use pretty much any 5V USB power supply and cable.
Configuration:
-
MiSTer FPGA MiSTer.ini 240p/480i configuration:
-
direct_video=1
- direct_video=2 for MiSTer updates beyond 11/9/2025 will automatically work with HDMI displays or Prism without changing direct_video settings
-
vga_mode=rgb
- Prism requires RGB video as the input format. It converts from RGB to YPbPr, and S-Video.
- composite_sync=1
-
direct_video=1
-
MiSTer FPGA MiSTer.ini 480p+ configuration:
- direct_video=0
- vga_mode=rgb
- composite_sync=0 for PC CRTs that don’t support composite sync.
- video_mode=____
Officially Supported Resolutions (not including custom resolutions):
Tested Devices:
Geometry or aspect ratio adjustments may be required. No guarantee of compatibility with all of these devices as firmware is always subject to change.
-
Consumer CRTs and PVMs
-
MiSTer FPGA (RGB/YPbPr and RGB + S-Video)
- Groovy MiSTer
-
MiSTer FPGA (RGB/YPbPr and RGB + S-Video)
-
PC CRT / HDTV VGA
- MiSTer FPGA (Analog IO board to consumer CRTs + Prism to PC CRT)
- PC
- SteamDeck
- Mac mini
- GCVideo to RGB (note: regenerate csync in GCVideo might not work for YPbPr)
- Wii2HDMI
- Wii U
- Switch
- Switch 2
- PS3
- PS5
- Xbox Series X
- Dreamcast HDMI
- MiSTer FPGA (Analog IO board to consumer CRTs + Prism to PC CRT)
Peripherals:
- HD15 (VGA) to YPbPr cable
- HD15 (VGA) to SCART cable
- Mini-Din 10 to SCART cable
- Mini-Din 10 to RCA + S-Video cable (Universal)
- Mini-Din 10 to HD15 (VGA) cable for Extron and some video upscalers (RGBS and audio only)
- Slim Profile 3.5mm to RCA Audio Cable (Amazon Affiliate)
Troubleshooting
What video formats does Prism support?
Prism expects RGB formatted HDMI video and outputs the same resolution as input. Prisms delivered in 2026 include a composite sync combination circuit.
HD15 (VGA): RGBHV or YPbPr (use slide switch to select)
Mini-DIN-10: RGBs and S-Video
Does Prism work with Analogue products?
No. Analogue products require a specific EDID signature that Prism doesn't support.
Can I connect Switch/PS5/Steam Deck to my 240p/15kHz CRT?
No, that requires a downscaler. HDMI minimum resolution is 480p. You can use Prism to connect those consoles to a PC CRT.
Why do I see dot crawl in my composite video signal?
Composite video is not officially supported. It is affected by dot crawl. There's no technical solution to improve the composite video signal.
