Sony EIAJ Portable AV3400
The 3400 took the portable concept from the CV2200 machines
and brought the performance up to a full-field EIAJ standard format.
The 3400 was capable of full recording and playback functions
including playback to the companion camera's viewfinder or an external
monitor or TV. This machine became extremely popular in schools and
the vast majority of 5" videotapes were probably made with one of them.