Which Atari multicart? Every current option for the 2600, 5200, 7800 (and the 2600+/7800+ catch)

You want to put a stack of games on one cartridge. Which multicart do you actually buy? Here's every current option for the Atari 2600, 5200, and 7800 laid out side by side — what it costs, how it loads, what it works on — with no favorites, just the data. Plus one big warning for anyone who just unboxed a 2600+ or 7800+.

This isn't a "best cart" post. Everybody's needs are different — WiFi vs. SD card, one console vs. five, forty dollars vs. a hundred and thirty — so the goal here is just to put the current options next to each other and let you pick. Prices and firmware move, so everything below was checked in July 2026 and dated; when in doubt, click through to the maker.

How to read the compatibility marks:

• ✅ full support (menu and all)
• ◐ partial — works in a single-game "developer mode" only (no on-cart menu)
• ❌ confirmed it does not work
• ⚠️ not confirmed — couldn't verify it either way (treat as "unknown," not "no")

Read this first if you own a 2600+ or 7800+

The modern Atari 2600+ (2023) and 7800+ (2024) aren't original hardware — they're small emulation boxes (a Rockchip chip running Stella and ProSystem out to HDMI) that read a real cartridge by copying its ROM into memory and emulating it. Good news up front: both consoles play 2600 and 7800 cartridges.

Here's the part that trips people up. A normal multicart runs a little menu program on the console to pick games — and an emulator can't do that; it just wants one plain ROM to copy. So:

• Full-menu carts with no single-ROM mode — PlusCart+, UnoCart-2600 — don't work. (The makers say so themselves.)
• Menu multicarts that have a "developer mode" — Harmony/Encore and Concerto — do work, but one game at a time. Dev mode hands the console a single ROM; you lose the on-cart menu.
• The one purpose-built option is the UnoCart+, which gives you a proper on-cart game picker — and even on the 7800+ it plays 2600 games only.

Two things the forum veterans will remind you of, and they're right. First, it depends on your revision and firmware. The "+" line isn't one fixed machine — later 2600+ runs improved the cartridge socket and software, the 7800+ has revised chips, and the 2600+ Pac-Man Edition uses the 7800+'s internals. Second, it keeps improving: the console firmware (currently 2.0.1.6, Dec 2025) and a separate "dumper" that reads the carts are actively updated by the community, and dumper updates are exactly what add support for newer and homebrew carts. So a "no" today can flip to a "yes" after an update — every mark below is a snapshot, not a law.

Atari 2600 (original hardware)

Atari 5200 (original hardware)

Atari 7800 (original hardware)

Will it work on your 2600+ / 7800+?

Consoles are $129.99 each (Atari). Current console firmware is 2.0.1.6 (Dec 2025). Remember: these are emulators, so this is really "can the console read this cart's format," not "does the cart run."

My ✅/❌ marks above were tested on an original-model 2600+ running current (mid-2026) firmware; a later hardware run or a newer firmware could behave differently — that's the nature of these consoles. If you've confirmed any of the ⚠️ boxes on your own 2600+ or 7800+, leave a comment and I'll update the table and credit you.

A note on the used market

A couple of these are worth knowing about before you chase an eBay listing. The Dragonfly (7800) is discontinued — good hardware, but new units aren't made, so anything you find is secondhand. Older AtariMax carts for various systems have come and gone over the years; the 5200 Ultimate SD above is the current, in-production one. If a listing's price looks too good, check whether the thing is still supported before you buy.

The old guard (retired carts)

Before the current lineup, a handful of carts walked so these could run. None are made anymore — you'll find them used, if at all — but the names still come up in collector circles, so here's what they were. The most recent to join this shelf is the Dragonfly (7800), discontinued only a few years ago and listed in the 7800 table above.

If you spot any of these secondhand, confirm it still does what you need before you pay collector prices.

On the horizon

The one generating buzz right now is the Ocelot — a new Atari 7800 cartridge teased by RetroIO, out of Italy. As of July 2026 it's still pre-release: there's a Discord and some teasers, but no final specs, compatibility list, or price yet. That's exactly why it's not in the tables above — you can't order one today — but if the early word is anything to go by, it's the 7800 cart to keep an eye on. When it ships and I can put one on my own bench, it goes in the comparison.

A couple of open-source projects are worth watching too. On the DIY side, Otaku-Flash (2600/7800/2600+) and PicoA10400 (2600/7800) are newer homebrew flashcart projects you build yourself rather than buy boxed. The field moves fast, and this is where the next options are coming from.

Frequently asked

Which multicart works on the Atari 2600+ and 7800+?
The UnoCart+ is the one built for them, with a proper on-cart game menu (2600 games only, even on the 7800+). Beyond that, the menu multicarts that have a "developer mode" — Harmony/Encore and Concerto — will load a single game at a time, just not their full on-cart menu. Full-menu carts with no dev mode, like the PlusCart+ and the UnoCart-2600, don't work. Because these consoles copy the cart's ROM and emulate it, and their firmware and cartridge "dumper" get updated regularly, compatibility can improve over time — so check your console's current firmware.

Is there a UnoCart for the Atari 5200 or 7800?
No. Despite the name being everywhere, there is no UnoCart-5200 and no native UnoCart-7800. The original UnoCart is an Atari 8-bit computer cartridge. For the 5200 the current options are the Atarimax Ultimate SD and the BackBit Pro; for the 7800, the Concerto, BackBit Pro, and 7800 GameDrive (plus the discontinued Dragonfly, used only).

What's the difference between a WiFi cart and an SD-card cart?
A WiFi cart (the PlusCart+) streams games from an online library over your home network — and it also keeps a smaller set of "offline" games (about 896 kB worth) in its own onboard memory, so it still works without a connection. An SD-card cart (most of the others) plays whatever ROM files you copy onto a card yourself, with room for your whole library. WiFi means less day-to-day fuss; an SD card gives you the most local storage.

Does one cart cover the 2600, 5200, and 7800?
Yes — the BackBit Pro is a single cross-platform cartridge that works across all three (and many non-Atari systems) using a per-console adapter. The trade-off is price ($129, one adapter included) and that extra adapters require some soldering.

What is the Ocelot cartridge for the Atari 7800?
The Ocelot is a new Atari 7800 flash cartridge teased in 2026 by RetroIO, out of Italy. As of July 2026 it's been shown off with a Discord community but hasn't shipped — no final specs, compatibility, or price are public yet. It's the one drawing the most buzz among newer 7800 carts, but you can't buy one today, so it isn't in the comparison tables above. When it's released and I can test it, I'll add it.

Further reading / sources

• PlusCart+ (my build) — chicagolandretrotech.com/products/atari-2600-pluscart
• PlusCart project — github.com/Al-Nafuur/United-Carts-of-Atari
• UnoCart-2600 (The Brewing Academy) — thebrewingacademy.com
• Harmony / Harmony Encore — harmony.atariage.com
• BackBit Pro — store.backbit.io
• UnoCart+ (for the 2600+/7800+) — 16-32bit.eu/unocartplus
• Atarimax Ultimate SD (5200) — atarimax.com/5200sd
• Concerto (7800) — 7800.8bitdev.org/index.php/Concerto
• Atari 2600+ / 7800+ — atari.com