To quote from the manual" The Acorn Replay DIY kit allows anyone to capture colour video and stereo audio at low-cost onto hard disc using standard equipment. Hardware on the expansion card reduces the video and audio bandwidth to allow capture in real-time from ordinary domestic VCRs, camcorders and videodiscs." 
 
"The hardware was designed for the A5000(with standard IDE disc drives) and A540. However the hardware may work successfully on previous Archimedes models providing you have 2MB RAM (4 MB for compression), a fast hard disc and ARM3."

The card can be fitted with an sVHS or S-Video connector fitted. This card does not have either of these connectors (see hole in the backplate between the Audio inputs and composite video connection).

Here is the Acorn Replay DIY capture system  manual.

Here is the Acorn Replay DIY capture system  application.