11 Oct
2010
11 Oct
'10
1:33 p.m.
A bit more on the shorting switch on your tester.
It's called an "exclusion key switch" and is used to prevent an
attached device from connecting to the line. Take a look at page 17
ff. in the UDS 208 modem manual:
http://www.arcelect.com/208A-B_manual.PDF
Thanks. Yes, that makes a lot of sense.
As an aside, I am not sure how off-topic this instrument is. OK. it's not
a classic computer, but I intend to use it for testing classic computer
peripherals (modems, of course). It is, iteself, over 20 years old, and
while it is not user-programmable (AFAIK), it does contain _6_
microprocessors (3 off 8085, an 8049, an 8041 (display driver, that one I
can see the purpose of) and a 32C010 DSP).
-tony