[GreenKeys] AB Drums

[Jones, Douglas W]

On Oct 28, 2015, at 2:44 PM, teletypeparts at comcast.net wrote:

> ...  There should be an uncoded AB drum in any 33 that was used with a computer.

On the MTS system (Michigan Terminal System, the best OS ever written for the IBM 360/67), the answer-back drum was routinely used during login.  Each terminal had a unique ID programmed into its drum, and the computer triggered the answer-back to get the user's location before the user logs in.

-- https://www.youtube.com/watch?v=cO6asQjQmPM

It's not an ASR-33 (it has a type-box like a Model 35, with a dial-up UCC that looks like it would fit on a Model 33, and in a narrow case like a model 33).  It uses the answer-back drum at 2:08 minutes into the video.

		Doug Jones
		jones at cs.uiowa.edu