Unlock the analog potential of MiSTer FPGA with IO Direct! Boasting accurate analog video, crystal clear analog audio, soft power toggle, and compatibility with the incredible MiSTer passively cooled aluminum armor case.*

* Requires a new rear panel

Features

• Reference-quality analog video and audio via Sega Saturn AV port
• 99% accurate to specifications
• RGB
• YPbPr** with improved sync levels and correct 700mV Luma
• S-Video** (native YC support)
• Composite Video** (native YC support)
• 24-bit video depth
• Hi-Fi analog audio
• Mini TOSLINK digital audio
• USB-C power with soft power toggle
• ADC-In (integrated into the rear 3.5mm port)
• User port for SNAC and mt32-pi
• Analog video OR HDMI output
• Dual SDRAM support
• Looking for a single SDRAM IO board, for that sweet simultaneous HDMI and analog audio and video? Check out IO Analog Pro! No cores currently require dual SDRAM. Jaguar (alpha), Saturn (beta), and Williams Y/Z unit arcade machines (upcoming) all need or benefit dual SDRAM.

** Use alternate INI files to switch between analog video formats (MiSTer_xxxx.ini)

Video measurements

Note: All non-MiSTer Addons measurements were taken by Kuro Houou.

Included Accessories

• 40mm fan
• 20mm heatsink
• DC Power Jumper
• HDMI Jumper

Configuration

In order to use dual SDRAM, you need to toggle switch 3 like so:

The DE10-nano should be configured for different IO boards as follows:

MiSTer.ini Settings

This IO board can output several different analog video formats, but not all simultaneously. Use the table or text blocks below to configure the MiSTer.ini file on your micro SD card. For testing purposes, I have 4 separate .ini files on a single card that I can easily switch between using controller button combos. Most users will probably want to modify their single MiSTer.ini file according to their desired video format.

240p RGBs (also for HDRetroVision and RGC RGB to YPbPr cables)

[MiSTer]

direct_video=1

hdmi_limited=0

forced_scandoubler=0

vga_mode=rgb

composite_sync=1

480p RGBs (requires Saturn to VGA and a monitor that supports composite sync)

[MiSTer]

direct_video=1

hdmi_limited=0

forced_scandoubler=1

vga_mode=rgb

composite_sync=1

240p YPbPr/Component video (Turn on Sync on Green switch)

[MiSTer]

vga_mode=ypbpr

composite_sync=1

hdmi_audio_96k=0

hdmi_limited=0

direct_video=1

240p S-Video + Composite Video

[MiSTer]

vga_mode=svideo

ntsc_mode=0

composite_sync=1

hdmi_audio_96k=0

hdmi_limited=0

direct_video=1