iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
On a MiSTer FPGA PSX core, first determine whether the symptom is a game-compatibility problem or a video timing and output-chain problem. Record the exact game release, core build, display path, and settings; then change one relevant option at a time. Fixed blanking and crop controls address sync and geometry changes, deinterlacing controls address interlaced scenes, and rendering options address color or texture appearance. Disable Fastboot and unsafe speed options before deciding that a game itself is broken, and keep the error overlay enabled so any fault code is available for diagnosis.
This guide is specific to the MiSTer PSX core. Other PS1 FPGA implementations may use different names, menus, or capabilities, so do not assume that a setting described here exists on another platform.
Start by capturing the setup
Do not begin by changing several switches at once. A before-and-after record is what lets you separate a core issue from a display issue and return to a known-good state.
- Game identity: write down the title, region (NTSC-U, NTSC-J, PAL, or another release), disc revision, and whether the problem appears on the first boot, after a save, or only in a particular scene.
- Core state: record the PSX core version or build date and the MiSTer system software version if known.
- Output path: identify the display, whether the signal travels over HDMI or an analog/VGA path, any converter or switch in between, and the cable type.
- Video settings: capture Fixed HBlank, Fixed VBlank, crop settings, deinterlacing mode, Sync 480i, dithering, 24-bit rendering, Texture Filter, and any scaling or aspect-ratio choices.
- Compatibility settings: note Fastboot, CD seek or CD speed options, and every other unsafe or speedhack option.
- Symptoms: describe whether the image loses sync, rolls, jumps, shakes, crops, flickers, bands in color, or shows incorrect textures. State whether the symptom follows a resolution change or remains constant.
Take a photo or capture of the problem if possible, but keep the written settings as the authoritative record. Change only one setting between tests and restore it before testing the next option when you need a clean comparison.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
Classify the symptom before touching options
| What you see | Most likely class to investigate first | First comparison |
|---|---|---|
| Display reports no signal, rolls, or loses lock when a scene changes | Timing, blanking, scaling, or the output chain | Fixed HBlank and Fixed VBlank; then Sync 480i for HDMI |
| Picture jumps vertically, is cut off, or changes position between scenes | Vertical or horizontal crop and blanking interaction | Fixed VBlank with the appropriate crop option |
| Interlaced scene flickers or has combing | Deinterlacing choice and display handling of 480i | Weave versus Bob; for HDMI, test Sync 480i |
| Checkerboard patterns, color bands, or a noticeably different texture finish | Rendering and post-processing choices | Dithering, 24-bit rendering, and Texture Filter separately |
| Hang, crash, missing graphics, or incorrect behavior tied to a title | Compatibility setting, BIOS, SDRAM, or a core/game issue | Disable Fastboot and unsafe speed or CD options; read the error overlay |
A PS1 game can deliberately move the image beyond the nominal screen area and can switch resolutions during play. Therefore, a symptom that occurs exactly at a resolution change is not automatically evidence that the game is unsupported or that the core has incorrect emulation.
Fix sync loss and resolution-change instability
MiSTer FPGA Documentation notes: If you experience problems with sync or the resolution changes don’t look right to you, give these options a try and see if that remedies the problem.
The controls below target different parts of that problem; use them as controlled comparisons rather than a universal preset.
Test Fixed HBlank first for horizontal timing
Fixed HBlank holds horizontal blanking at a stable value while the game changes modes. The documentation says it generally preserves the original 4:3 output and can improve stability when a title varies resolution or places the image outside the normal bounds. Enable it, return to the exact scene that caused the failure, and check whether the display remains locked and whether the left and right edges still look correct.
Recommended Free Tools
Do not judge Fixed HBlank solely by whether the image fills a modern widescreen panel. The useful result is stable timing with the intended 4:3 geometry. If the picture becomes stretched or gains an unexpected border, compare the display’s own aspect and scaling controls rather than compensating with an unrelated core option.
Use Fixed VBlank for vertical changes
Fixed VBlank stabilizes vertical blanking. It also enables vertical crop choices intended for common 224p and 216p material. If the image moves up or down between menus and gameplay, is clipped at the top or bottom, or changes apparent height in a PAL title, enable Fixed VBlank and compare the available vertical crop settings.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Crop is a geometry decision, not a compatibility fix. A crop that looks right in a 224-line game may remove content from a 216-line scene, and a setting that suits one title may be wrong for another. Record the title and region with the crop choice so you can revert it when changing games.
Consider horizontal crop for PAL-specific framing
The guide identifies horizontal crop as useful for some PAL games. Use it only after confirming that the problem is a consistent left/right framing issue in a PAL release. It is not a general remedy for every PAL timing change, and it should not be used to hide a cable, scaler, or display overscan problem.
The Tool Desk
Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →For HDMI, test Sync 480i when switching to 240p
Some displays take too long to accept a transition from 480i to 240p or briefly report no signal. On HDMI, the MiSTer option named Sync 480i can speed those resolution changes on many displays. Test it with a scene that reliably changes mode. A display that still blanks may be rejecting the timing, so test a different input or direct connection before labeling the core incompatible.
Use the documented screen-shake example correctly
Metal Gear Solid is the documentation’s example of a game whose deliberate screen shake can cause a modern display to lose sync. If the failure coincides with the shake effect, compare Fixed HBlank and Fixed VBlank before changing game-specific compatibility options. If only that effect fails while ordinary menus and gameplay remain stable, the pattern points toward timing tolerance in the display chain rather than a broad failure to run the game.
Choose a deinterlacing mode for interlaced scenes
Weave: the stable default
Weave is the default mode and is often preferred when you want a steady picture. It combines the two fields of an interlaced frame. On a modern progressive display, it can expose combing on motion, but it normally avoids the constant vertical jitter associated with Bob.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Bob: sometimes preferable on a CRT
Bob displays fields in succession and therefore looks jittery on many displays. Some CRT setups nevertheless look more natural with Bob because their motion and scanline behavior resemble the original presentation. Choose it only when that trade-off is intentional; a jittery result is expected behavior of the mode, not proof of a broken game.
Separate deinterlacing from sync
If an interlaced scene flickers, test Weave and Bob without changing blanking or crop at the same time. If the entire display loses lock during the transition into 480i, investigate Sync 480i and the HDMI chain separately. This two-part test tells you whether the issue is field reconstruction or the display accepting a new timing.
Diagnose color, dithering, and texture appearance
Dithering
PS1 games often rely on dithering to make limited color output appear smoother. The MiSTer dithering option can improve a checkerboard-looking image in some games, but it can also introduce color banding that you dislike in others. Treat it as a per-title visual preference. Compare a flat gradient, a dark shadow, and a bright sky rather than judging from one busy scene.
24-bit rendering
The 24-bit rendering option may smooth graphics in some games. Smoother is not automatically more accurate: it changes how the core presents the source image and may alter edges or gradients that were intentionally quantized. Test it with the same camera angle and lighting before deciding whether the result is an improvement.
Texture Filter
Texture Filter applies optional smoothing to 3D textures. It changes the visual style, especially on distant walls, floors, and large polygons. A sharper or blurrier texture after enabling it is an expected presentation change, not evidence of an emulation error. Keep Texture Filter tests separate from dithering and 24-bit rendering so you know which control produced the difference.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Do not confuse a preference with a fault
If a title is otherwise correct but its colors or texture edges look different after a setting change, restore the previous value and compare. Report a rendering bug only when the artifact remains with the documented visual options at their neutral or default values and can be reproduced in the same scene.
Remove compatibility risks before diagnosing a game
Turn off Fastboot for a clean test
Fastboot can cause bugs in a small number of games. If a title skips its startup sequence, displays incorrect early graphics, hangs during initialization, or behaves differently from a normal boot, disable Fastboot and repeat the test from a fresh launch. Keep the result tied to the exact region and release because startup behavior can differ between versions.
Disable unsafe speedhacks
Speedhacks can sacrifice compatibility. Faster CD seek or CD speed settings may shorten loading in some situations, but games that depend on original timing can hang or crash. Before reporting a title as broken, return these options to their safe or default values and reproduce the same steps. Only after the safe configuration fails should you compare one performance option at a time.
Keep compatibility and picture quality separate
Fastboot and CD timing options can change whether a game runs; dithering, 24-bit rendering, and Texture Filter change how it looks. Do not use a rendering option to fix a crash, or a speedhack to fix a color artifact. Separating those questions prevents a visual preference from masking a real compatibility regression.
Quick wins for a faster PC:
Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Read and preserve the error overlay
Leave the MiSTer error overlay enabled while diagnosing. Its code narrows the fault category and gives maintainers something more useful than a description such as “graphics glitch.” The official PSX guide lists these examples:
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
| Code or category | What it indicates | What to record |
|---|---|---|
| E3–E6 | GPU hangs | The exact code, scene, game release, core build, and settings at the moment of the hang |
| E9 | GPU FIFO overflow | Whether it occurs during a resolution change, effect, or ordinary gameplay |
| ED | CPU data or bus timeout | The code plus BIOS status, SDRAM presence, and whether the failure is repeatable from boot |
ED can also point to a missing or corrupt BIOS or absent SDRAM. Check those prerequisites before treating ED as proof of a game-specific defect. Photograph the overlay if the message disappears after a reset, and transcribe every character exactly.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check the physical and display path
Once core settings are controlled, isolate the output chain. Connect the MiSTer directly to the display if a switch, receiver, scaler, or converter is involved. Try a known-good cable and input, disable display-side “auto” processing when the display offers a fixed timing mode, and compare another monitor or television. A second display that remains locked under the same core settings is strong evidence that the first display or converter is the limiting component.
HDMI and analog output are not interchangeable tests. The analog I/O path has an 18-bit output limitation noted in the official documentation, and the related option affects VGA/analog output differently from HDMI. If you use analog, record the specific board revision and signal path; do not assume that an HDMI result predicts analog behavior. Check settings and cable compatibility before considering an accessory, and verify the exact hardware revision if you eventually need a replacement or expansion.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Use a repeatable troubleshooting procedure
- Reproduce from a clean boot. Start the same game release and return to the scene that demonstrates the problem. Note whether it occurs at boot, during a mode switch, or only after a specific action.
- Save the baseline. Record all core, MiSTer.ini, display, and output-path settings and capture the error overlay if present.
- Confirm the output path. Test a direct connection and a known-good cable before changing emulation settings.
- Classify the symptom. Choose timing, geometry, interlace, rendering, or compatibility as the primary branch.
- Apply the smallest relevant change. For sync, compare Fixed HBlank; for vertical geometry, add Fixed VBlank and the appropriate crop; for HDMI 480i transitions, test Sync 480i; for interlace, compare Weave and Bob; for appearance, test one rendering option.
- Repeat the exact scene. Do not judge a setting from a different level, camera angle, or display input.
- Return to safe compatibility settings. Disable Fastboot and unsafe speed or CD options, then reproduce any crash or hang.
- Check prerequisites for codes. For ED, verify BIOS and SDRAM; for GPU codes, retain the exact code and timing of the failure.
- Compare another display path. HDMI versus analog, or a second monitor, can reveal whether the core or the display is rejecting a mode.
- Document the winning combination. Write down the per-game settings and the trade-off, such as stable sync with a crop or a less-jittery Weave image.
When and how to escalate an unresolved issue
After safe settings and a controlled output path still reproduce the fault, check the upstream PSX_MiSTer repository and its issues for a matching report. An issue entry by itself does not establish that a game is unsupported or that a fix has shipped; verify the affected core build and the report’s reproduction details.
A useful report includes:
- Game title, region, disc or release revision, and the exact steps that trigger the symptom.
- MiSTer PSX core build and system software version.
- Display model or type, HDMI or analog path, cable or converter details, and whether another display was tested.
- Every relevant OSD or MiSTer.ini option, including Fixed HBlank, Fixed VBlank, crop, deinterlacing, Sync 480i, dithering, 24-bit rendering, Texture Filter, Fastboot, and CD or speed settings.
- The complete error-overlay code and a photo or capture when available.
- Whether the behavior changes when one named option is enabled or disabled.
This level of detail lets maintainers distinguish a timing negotiation failure from a core emulation fault and avoids turning a display-specific symptom into an unsupported-game claim.
Decision guide: which setting to test
| Symptom and setup | Test order | Trade-off to watch |
|---|---|---|
| PSX core loses sync during a resolution change on a modern HDMI display | Fixed HBlank, then Fixed VBlank; test Sync 480i for 480i-to-240p transitions | Stable lock may require title-specific crop or display scaling choices |
| MiSTer PSX screen shaking causes a blank or rolling picture | Reproduce the shake, compare fixed blanking, and test a direct HDMI path | Do not mistake a display’s sync tolerance for a universal game failure |
| Picture jumps or is cropped in a PAL game | Fixed VBlank, vertical crop, then horizontal crop if the left/right framing is the issue | Crop values that suit one line count or region can remove content elsewhere |
| Interlaced scene looks unstable | Compare Weave and Bob without changing other settings | Bob can be preferable on some CRTs but is visibly jittery on many displays |
| PS1 FPGA color banding or checkerboard texture | Compare dithering, then 24-bit rendering, then Texture Filter one at a time | Each changes appearance; none is a universal accuracy fix |
| Game has graphics glitches on MiSTer plus hangs or crashes | Disable Fastboot and unsafe CD or speed options, then inspect the overlay | Faster loading settings can break games that rely on original timing |
There is no documented aggregate percentage that describes PS1 FPGA compatibility or the frequency of these visual symptoms. Treat each result as a reproducible observation for the named title, release, core build, and display path rather than as a general compatibility rate.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
