Glossary · 56 terms

Handheld & Emulation Glossary

The vocabulary that actually changes a buying decision, defined plainly. If a spec sheet uses it, it is explained here.

PC Handhelds

TDP (Thermal Design Power): The wattage a chip is set to run at — the single biggest lever on battery and performance.
Sustained vs Peak TDP: The wattage a device can hold for a whole session, versus the number it hits for seconds.
APU (Accelerated Processing Unit): CPU and GPU on one chip — the heart of every x86 PC handheld.
SoC / Chipset: The system-on-a-chip at a device’s core — the thing that sets its ceiling.
SteamOS: Valve’s Linux-based, controller-first handheld OS — tuned, quiet, and battery-friendly.
Windows on a Handheld: The compatibility hammer — runs everything, but was never designed for a gamepad.
Anti-Cheat Compatibility: The reason some multiplayer games run on Windows handhelds but not SteamOS.
ARM vs x86: The two instruction sets behind handhelds — mobile-efficient vs desktop-compatible.

Emulation: Software that reproduces old hardware so a handheld can run its games — legally-owned ones.
RetroArch (RA): A single front-end that runs many emulators (“cores”) under one interface.
Core (libretro): An individual emulator running inside RetroArch — one core per system, sometimes several.
Frontend: The menu layer that organizes your library and launches the right emulator.
BIOS: Low-level firmware some consoles need to run — you must supply it from hardware you own.
ROM: A game’s image file — legitimate only when it is a copy of a game you legally own.
Chipset Tier: A band of roughly-equivalent silicon — the unit we shop emulation by.
Emulation Ceiling: The newest console generation a device runs well — the honest ceiling, not the marketing one.
Compatibility Band: Full-speed / playable / struggles — how we describe a chip’s reach honestly.
Per-Game Tuning / Overrides: Adjusting settings title-by-title to push a demanding game into “playable.”
Save State: A snapshot of the exact machine state — save and resume anywhere.
Shader: A visual filter — CRT scanlines, LCD grids — layered over an emulated image.

Cloud Gaming: Running games on a remote GPU and streaming the video — hardware-light, network-bound.
Local Streaming (Moonlight / Sunshine): Streaming from your own gaming PC over your home network — no subscription, low latency.
Input Latency: The delay between button and screen — the real bottleneck of any streaming setup.
Bitrate: How much data the video stream uses — the lever on streamed image quality.

OLED: Self-lit pixels: perfect blacks and per-pixel contrast — with a long-tail burn-in caveat.
IPS LCD: The backlit standard — no burn-in, often bright, at the cost of grey-black contrast.
Nits (Brightness): The unit of screen brightness — the number that decides outdoor and lit-room usability.
VRR (Variable Refresh Rate): The screen syncing its refresh to the frame rate — smooths handheld frame-rate swings.
Refresh Rate: How many times per second the screen updates — 60Hz, 90Hz, 120Hz.
PPI (Pixel Density): Pixels per inch — how sharp a screen looks, set by resolution and physical size together.
Resolution (720p / 1080p / 1200p): The pixel count — important, and the one screen spec marketing over-weights.
Burn-In: Permanent ghosting of static images on OLED over long exposure — the panel’s one long-tail risk.
Upscaling (FSR and friends): Rendering at a lower resolution, then intelligently scaling up to save performance.
Frame Pacing: How evenly frames are delivered — smoothness you feel even at the same average fps.

Hall-Effect Sticks: Contactless magnetic sticks with no wiper to wear out — the drift-resistant design.
Potentiometer Stick: The classic analog stick — cheap, proven, and the usual source of drift as it wears.
Stick Drift: A stick registering movement when untouched — the failure handheld owners regret most.
Deadzone: The central area where small stick movement is ignored — tuned to hide or expose drift.
Gyro Aiming: Motion-sensor fine aiming layered on stick control — precision without a mouse.
Ergonomics: How the device feels over hours — the spec no number captures and every owner feels.

UFS: Faster onboard storage with strong random I/O — fewer loads and stutters.
eMMC: Budget onboard storage — fine sequentially, weaker on the random reads that matter.
microSD Speed Class (A1 / A2 / U3 / V30): The ratings on a card — and which one actually changes handheld performance.
IOPS (Random I/O): Small-random-operations-per-second — the storage metric that actually drives game loads.
Counterfeit SD Cards: Fake high-capacity cards that fail on fill — the storage risk that costs real libraries.
NVMe (M.2 in Handhelds): The fastest storage tier — swappable in some PC handhelds, sized by the 2230 form factor.

Dock: A base that turns a handheld into a small console on a TV or monitor.
USB-C Hub: A compact multi-port adapter — a travel dock, only as good as its power passthrough.
DisplayPort Alt Mode: The USB-C feature that lets a device output video at all — not every port has it.

USB Power Delivery (PD) Wattage: The wattage a charger or dock can supply — must exceed what the handheld draws.
Battery Capacity (Wh / mAh): The size of the tank — meaningful only against the device’s watt draw.
Thermal Throttling: A chip cutting power to shed heat — the reason peak performance never lasts.

Firmware: The device’s built-in operating software — kept current for fixes and features.
Custom Firmware (CFW): Community-built replacement software that unlocks tuning and features — with real caveats.

Price per Performance: What a device delivers per dollar against the ceiling you want — the only honest value metric.
Refurbished & Used Handhelds: The secondhand lane — real savings, with stick wear and battery health to check.