CatFlash Mittens (4Mbit GameGear Flash Cartridge)
Description
CatFlash Mittens is a 512 KB / 4 Mbit reprogrammable flash cartridge board compatible with the Game Gear.
It provides 512 KB of ROM space and includes an onboard CPLD mapper for Sega-style bank switching. This allows it to run games beyond the standard cartridge size limit. It's fully compatible with devkitSMS banked code.
Perfect for homebrew releases, demos, ROM hacks, and development builds.
Save data can be written directly to flash, so there is no coin-cell battery to die and need replacing. The board is designed to fit inside a standard Game Gear cartridge shell for a clean cartridge look.
It can be reprogrammed as many times as needed.
Manufactured by Two Black Cats.
A compatible cartridge flash programmer is required to write software to the cartridge. Tested options include:
- Sanni Open Source Cart Reader / Open Cart Programmer with RetroDumper GameGear to MD slot adapter (available in Amazon Japan) or other Master System to Gear adapters.
- Raphnet programmer with the Raphnet Game Gear adapter.
- 512KB / 4Mbit reprogrammable flash
- Compatible with Game Gear
- CPLD mapper with Sega-style banking (devkitSMS compatible)
- Flash-based saves possible
- Native 5 V operation
- Fits standard cartridge shells (shell not included)
Shipping
- EU: 3–7 business days. Free over €50.
- UK: 4–8 business days. Free over £45.
- US: 5–10 business days. Free over $75.
- Japan: 7–14 business days. Free over ¥8,000.
- Rest of world: 10–21 business days. Tracked international shipping calculated at checkout.
Returns
We accept returns within 30 days of delivery for unopened, unused items in original packaging. Buyer covers return shipping unless the item arrived damaged or defective.
See the full refund policy for details, or contact us if anything's wrong with your order.
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