TASCAM's 8 track reel tape is 1/2" (80-8 model). The cassette tape multi-track is called L-Cassette which was not successful at all. The 8 track looped tape is the one popular among jeepneys and buses. Those are consumer playback systems. The pro ones are 1" (that's why the better sounding 16 trackers are the 2" ones).
Wait a minute, he said his 8 track tape is 1/2", so could be the TASCAM 80-8 format. I used to have this machine but was bought by some Guamenian long time ago. I dunno of anybody whose got it presently. Maybe some old radio studios? Veritas, perhaps? Or that studio of Father Reuter?
FWIW