Active quad RGB amplifier
A dedicated quad video amplifier boosts weak Atari analog color levels to a strong, consistent range before the monitor sees them.
ATARI ST
Active VGA adapter for early Atari ST machines, weak signals and jailbar-prone hardware. Quad video amplifier, analog filtering, buffered outputs. Micro-USB powered.
Compare ST2VGA models ↗
Active VGA adapter for early Atari ST or machines with weak video output
The ST2VGA Enhanced Adapter is the active sibling of the ST2VGA family. It plugs into the Atari monitor port and runs the RGB lines through a dedicated quad video amplifier, an analog low-pass filter and buffered outputs before they reach the VGA cable. The result is a stronger and cleaner image on machines that struggle with a passive adapter: early Atari ST boards without a +12 V rail on the video port, machines with weak or noisy color output, displays prone to vertical “jailbars” and long-cable setups that fail to lock on the signal. Powered by a 5 V micro-USB supply, so it works on Ataris that cannot feed a passive adapter at all.
From €25 plus taxes. Ships from Spain. Atari ST, STE, Mega ST, Mega STE.
Video Gallery
Key features
Analog low-pass filtering
Removes high-frequency noise outside the useful video bandwidth. Smoother colors, cleaner edges, less shimmer on modern LCDs.
Buffered RGB outputs
Isolates the Atari video circuitry from the VGA cable and monitor input. Better signal stability with long cables and picky LCD inputs.
Jailbar reduction
The buffered and filtered output reduces (and on many machines eliminates) the vertical "jailbar" pattern produced by digital noise coupling into the analog RGB lines.
Works on early ST without +12 V
External 5 V micro-USB power means the adapter does not rely on the Atari +12 V rail. The right pick for very early Atari ST boards that do not expose +12 V on the monitor connector.
Color/Mono slide switch
A slide switch toggles between color modes (ST Low/Medium) and mono mode (ST High) on the fly. No software, no jumpers.
Choose the right ST2VGA
Two adapters, same family, different jobs. Pick the one that fits your machine.
ST2VGA Enhanced Adapter
€25 plus taxes
- Early Atari ST with no +12 V on the video port
- Visible "jailbars", ringing or color noise on a modern display
- Long VGA cables or picky LCD inputs that fail to lock
- Restoration project where you want the cleanest possible image
ST2VGA Adapter
€17 plus taxes
- Healthy Atari ST, STE or Mega ST with a clean video output
- Machine already known to drive a passive VGA adapter
- Save €8 on a machine that does not need active conditioning
Specs
- Weight: under 50 g
- Dimensions: approximately 38 mm x 45 mm x 36 mm
- Power: external 5 V via micro-USB
- Atari connector: DB-13W3 (Atari monitor port)
- Output: VGA-compatible (multisync monitor required for color modes)
- Audio: 3.5 mm stereo jack (mono routed to both channels)
- Active stage: quad video amplifier with analog low-pass filtering and buffered outputs
- Horizontal sync: 15 kHz (ST Low / Medium), 31 kHz (ST High)
Frequently asked questions
Hardware & compatibility
What is the difference between ST2VGA and ST2VGA Enhanced?
The passive ST2VGA Adapter is the right pick for machines whose video output is already strong and stable. The Enhanced version adds an active RGB amplifier, analog low-pass filtering and buffered outputs, so it is better suited for early Atari ST boards, machines with weak or noisy signals, jailbar-prone hardware and long-cable setups.
Is the ST2VGA Enhanced useful for very early Atari ST machines?
Yes. It is especially useful for older Atari ST boards that do not expose +12 V on the monitor port, since the adapter carries its own external 5 V supply over micro-USB.
Is there a 3D printable enclosure?
Yes. Enclosure files and links for the ST2VGA family live in the ST2VGA family Enclosures/Cases page.
Can this damage my Atari?
No. The adapter is electrically safe and isolates the Atari video circuitry from the VGA cable through its buffered output stage.
Video & timings
Does this device upscale or scan-double the picture?
No. The Enhanced adapter preserves the original Atari timings and scan frequencies. A 15 kHz-capable VGA monitor is still required for color modes.
What video modes are available, and what monitor do I need?
Color modes (ST Low and ST Medium) require a VGA monitor that accepts a 15 kHz horizontal sync signal. Mono mode (ST High) works on any standard VGA monitor. The 15kHz reference list is the most practical starting point if you are unsure about a model.
How do I switch between video modes?
A slide switch on top of the adapter toggles between color modes (ST Low / Medium) and mono mode (ST High) on the fly. No software needed.
Does the Enhanced really get rid of jailbars?
On most machines, yes. The buffered output isolates the RGB lines from the monitor input, and the filtering removes the high-frequency components that show up as the vertical bar pattern on modern LCDs. On the most extreme cases the artifact is heavily reduced rather than eliminated, but the picture is always noticeably cleaner than with a passive adapter.
Power & audio
Why does the Enhanced version need external power?
The integrated video amplifier and buffering stage need a stable 5 V supply to operate correctly. They live outside the Atari video circuitry on purpose, so they cannot draw power from the monitor port.
Is a power supply included?
No. The Enhanced adapter ships without a power supply. You provide a reliable, well-regulated 5 V micro-USB charger and a good-quality cable.
How is audio handled?
The adapter includes a 3.5 mm audio jack. The Atari’s mono audio signal is duplicated on both left and right channels for easy connection to speakers, amps, capture devices or headphones.
Community & policy
Is this product for me?
Yes, if your Atari has weak or noisy color output, you see vertical “jailbars” on a modern LCD, your machine is an early ST board without +12 V on the video port, or you want the cleanest possible image out of a restoration project. It is a homebrew product built for hobbyists, not a sealed appliance.
Why can’t I access the store even though you ship to my country?
Access to our products and community spaces requires basic respect. We have zero tolerance for harassment, personal attacks, abusive behaviour or defamatory content toward our team or community. The principle is simple: don’t be abusive. If that principle is violated, access is revoked. We build for people who enjoy experimenting, not for people creating hostility.
Certifications & Compliance
This product has been assessed for European (CE) and UK (UKCA) conformity. Official Declarations of Conformity and EMC Assessment reports (ST2VGA-ENHANCED REV1.0.0):
