I went scrounging today and found this. I can't use it but it's too good to waste so I thought I'd see if anyone here could use it. It's on a small tape spool and is marked "4010A01 Plot 10(R) Terminal Control System Level 5.01 (C)Copyright Tektronix Inc 1988 Format IBM ASCII 1600 BPI Label: None Serial No. B074512 Record: 80 Block: 800 Option: 08". Joe