Nope.I'm still puzzled. You want to use a GoPro as the camera but you also want a 'small' portable recording system to go with it - non-PC based to keep the size down?
Let's start from the beginning. I make it short:
A camcorder like the Sony VX1000, that records onto tape, used to be connected to a VCR through RCA or S-Video cables to transfer footage onto a VHS tape. Later, with the advent of PCs, Firewire became the preferred method for connecting the camcorder to the computer. Firewire facilitated the easy transfer of data, allowing users to transfer footage from the camcorder to the PC seamlessly.
The Sony VX1000 is highly regarded as a great camera, and its Firewire OUT port opens up the possibility of using devices like the Sony HVR-MRC1 memory recorder to record directly onto a memory card instead of using tape. Unfortunately, these recorders have not been in production for over two decades, and although they can still be found, they come with a hefty price tag of $400 due to their outdated status.
To address this issue, an alternative idea was to connect a Firewire card to a GoPro camera. The plan was to solder the Firewire cable to the GoPro's motherboard, enabling the GoPro to record the incoming signal directly. However, it turns out that this process is not as straightforward as initially anticipated and requires more complex steps than originally thought.
EDIT: The idea is to "build" something like the HVR-MRC1...