[GreenKeys] M28 Label

[David I. Emery]

On Tue, Jul 30, 2019 at 11:18:53AM -0400, Peter Gottlieb wrote:
> It was 9960 in Westchester County NY. 
> 
> I had them install a DAA so I could play. The tech that showed up had no idea how to set the levels so we went through the BSP together and figured it out between us and the CO, who had never installed one either. It was a day of fun for me as a teenager. 

	Back then very few modems that had the line control logic and
firmware and analog interfaces to work on dial up lines had anything BUT
DAA interfaces.... so you actually HAD to have a DAA (or some home grown
equivalent).  Modems didn't just have a RJ jack with the two wires of
the line on it.

	I spent more time than I like to remember making software
control of dial up modem connections work with that antique DAA based
hardware (including relay based AT&T dial pulse dialers that weighed
about 35 lbs - of solid iron and copper - containing  literally several
dozen telco wire spring relays) when I was at Data General in the mid
70s - just before DAAs were finally eliminated (and the US Robotics AT
command set became the standard for modem interfaces).

	Back then and earlier, there were telco offices (office codes)
in most places called the Official Office... with a standard set
of about 100 line numbers usually starting with 00 or 99 (99xx) that
had all those test capabilities including pairs of numbers that
would loop back what was on one number to a second one, allowing
one to measure what a modem was sending and feed it it test tones via
its interface... and all kinds of other magic things old phone freaks
remember.


-- 
  Dave Emery N1PRE/AE, die at dieconsulting.com  DIE Consulting, Weston, Mass 02493
"An empty zombie mind with a forlorn barely readable weatherbeaten
'For Rent' sign still vainly flapping outside on the weed encrusted pole - in 
celebration of what could have been, but wasn't and is not to be now either."