I found this video on YouTube, it’s a “B” roll of news footage from a Target in Minnesota. Filmed in 1986, the first few minutes of the video feature the checkout area. This particular store was using IBM 3653 cash registers, assumedly in production for several years at this point. Target was using a mix of technology in the mid 1980s; newer stores used IBM 3683 cash registers at the time.
Watching the operator guidance panel when the cashier starts a new transaction. I’m assuming the user is cashier #16, then enters a “1” for “Cash Sale”, and then enters six digit SKUs and the price of each item.