Yes, its a Lynx Flash Card.
USB, 115200Baud, 512K Flash, compatible to Lynx I and II, 93C46 for High Scores (up/download via USB)
And its 100% made by the Lynxman.
The Hardware is 98% finished. The Software around 80%. I have to add a Bootloader for Firmware update.
The Card is controlled by a µCom.
It is (of cause) possible to load all kind of games, 128/256/512K.