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WonderSwan unofficial flash cartridge index

Comparison

Notes:

“Re-flashable?” terms:
- “Self” - the WonderSwan alone is sufficient to flash the cartridge. One can use BootFriend to reflash such a cartridge.
  - Be careful - if the cartridge is re-flashed without a valid cartridge header, the console will not turn on with it inserted again!
- “USB” - the cartridge includes a USB port which can be used for flashing.
- “External” - external device required. This does not include hardware which has an edge connector or pinout for manufacturing use only.
Cartridges marked in Bold are currently manufactured (as of writing).

Name	Flash chip	PCB marks	Flash size	Re-flashable?	SRAM Size	RTC	Mapper	Notes
Wonderswan 8MB, 32KB FRAM Flash Cart (InsideGadgets)	MX29LV640ET/EB		8 MB	External	32 KB (128 KB?)	No	2001
WS Flash Masta	JS28F00AM29EWHA	www.FlashMasta.com, WS Flash Masta USB	16 x 8 MB	USB, Self	512 KB	?	2003
WonderMagic Color	?		?	External, ?	?	?	?	The only console-contemporary flash cartridge. Rare.
WonderDog V1 (64Mbit)	?		8 MB	External, ?	512 KB	?	?
WonderDog V3 (64Mbit)	?		8 MB	External, ?	512 KB	?	?
WonderDog V3 (32Mbit)	?		4 MB	External, ?	?	?	?
WonderDog V3 (4Mbit)	?		512 KB	External, Self	256 KB?	?	?	WonderWitch (PTS-0101) clone
AliExpress bootleg (liulili_0421)	MX29LV640???	WONDERSWAN REPROGRAM CARTRIDGE DESIGN BY LIULILI_0421	8 MB	256 KB	?	?

The “Due to hardware limitations” compatibility list is outdated and inaccurate. Software flaws in the official menu software caused many of the incompatibilities.
Flash Masta rev4 uses a genuine Bandai 2003 chip, rev5 uses a re-implementation - details unknown.
Until August 2023, the price was $100 (with the occasional 10-20% off sale).
The SD card port available on the Flash Masta rev4 is non-functional - it's wired up to the AVR chip, but there is no way exposed to use it on production firmware.