[GreenKeys] ASR33

[Anthony Vallot]

Don:

I worked for many years in teletype repair for the USAF.  I know that an
ASR33 does produce spikes; that is the reason for the RLC filters in the
signal line.  You would need to look at the signal with an oscilloscope
before you can tell if it is clean enough for the PDP-11.

Tony

-----Original Message-----
From: greenkeys-bounces at mailman.qth.net
[mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Don Robert House
Sent: Friday, September 18, 2009 11:29 PM
To: B M
Cc: David Weil; greenkeys at mailman.qth.net; Christian R. Fandt
Subject: Re: [GreenKeys] ASR33

You need to contact someone else who has already done what you are  
attempting.
I no longer have any of the Classic Computer guys in my email address  
book.

I will copy a couple of men who might be able to steer you.

Guessing is not the best solution.  The smoke is hard to get back into  
the unit.

Don
K9TTY


On 18 Sep 2009, at 6:49 PM, B M wrote:

Is the ASR33 capable of generating voltage/current spikes via the 20mA
connection?  I realize the connection is passive, but what exactly is
the 20mA connection driving? Should I be concerned about connecting
the ASR33 directly to my old PDP-11's?  I am more concerned about
ensuring the PDP-11 will be ok and not as concerned if something bad
happens to the ASR33 since the TTY is much easier to fix/replace :-)

Is there any tests I could perform before hooking the TTY to my  
computer?

Many thanks for any information.

--barrym
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