>IIRC, there was also a "head of string" 3350 that would act as a controller.
No, the HOS (A-unit) was required to connect to the 3880. B-units were the next in line. I think the last was a C-unit, but that might have been on for 3330's. (That last part is an entry in my dimmer parts of my own memory) - Too busy driving to stop for gas! ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html