[ARC Tech-109]

Unfortunately I don't have any hard docs, I worked as a "golfer" at a boutique audio store in the 1980s and remember the products well but didn't save any of the sales rep stuff. There's some stuff floating about the internet but like my 54 year old memory it's not perfect. I believe the AFM stereo was around the early days of 1985 and digital just before the holiday shopping season, the demo tape I have has the A-Ha video of Take On Me and that album was released October of 85, the video was in MTV rotation that late summer. Wikipedia has some historical evidence that seems to align with what I remember but it also contradicts other timelines.
120 min tapes came about with Hi8 as that required a metal particle spec. Digital audio was a dumbed down version of the Sony PCM-F1 that was mated to a Sony SL-2000 but as I understand the sample & depth was limited due to bandwidth to keep it out of the AFM allocation.