You're viewing a comment by Ollie Jones and its responses.

Ollie Jones Permalink
March 09, 2012, 19:31

For three bonus points ... what does the HERE IS button do?

Comment Responses

March 09, 2012, 19:42

Can't figure it out. Tell us! :)

Ollie Jones Permalink
March 09, 2012, 21:16

I guess the teletype interface is truly in the dustbin of history (where it belongs, no doubt).

Pressing HERE IS causes a teletype device (the ADM3A is one) to send its station identification, if equipped with an answerback option. The reception of an ENQ (CTRL-E) character from the far end also causes the device to transmit its identification.

I never saw an ADM3A that actually had an answerback option. The Lear-Seigler folks must have imagined they were going to sell this baby as a glass telex. Then Bill Joy developed vi, and business took off.

http://www.classiccmp.org/dunfield/altair/d/adm3a.pdf page 3-8.

Gunner Permalink
March 09, 2012, 21:23

Mr. Jones didn't reply so I looked it up:
http://en.wikipedia.org/wiki/Teleprinter#.22Here_is.22_key

Not as interesting as I had hoped... maybe someone can offer some context.

anon Permalink
March 09, 2012, 20:56

Perhaps it is to print the working directory; $ pwd.

Mikael Permalink
March 09, 2012, 21:16

It does make the cursor blink, maybe?

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