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From: cs161fhn@sdcc10.ucsd.edu (Dennis Lou)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Wanted: Amiga 1000 power supply and what is the "tick" line???
Keywords: Needed A1000 Power Supply!!!
Message-ID: <17442@sdcc6.ucsd.edu>
Date: 13 Mar 91 07:46:00 GMT
References: <58@swpyr2.sbc.com> <1991Mar13.003325.1993@ux1.cso.uiuc.edu>
Sender: news@sdcc6.ucsd.edu
Organization: University of California, San Diego
Lines: 31

In article <1991Mar13.003325.1993@ux1.cso.uiuc.edu> dvsg0223@uxa.cso.uiuc.edu (David Salamon) writes:
>ammrk@swpyr2.sbc.com (Mike R. Kraml) writes:
>
>>Wanted: Amiga 1000 power supply.  Also,  what is the "tick" line coming out 
>>of the A1000's power supply?  There is +5, +12, Gnds, and "tick".  What is 
>>the "tick"?  
>
>The "tick" signal is a TTL square wave signal at 60 Hz, synchronized with the
>AC power line.  The A1000 power supply uses an optoisolator and some diodes
>and RC components to pull this signal directly from the AC 120V line (in the
>US and Japan that is).  I'm not sure what this signal is used for on the
>motherboard, but I'm told by my dealer that the machine will not run without
>it.
>
>My dealer also mentioned that many PC/Clone power supplies also supply this
>signal.

I doubt it.

The lines coming out of a PC/Clone supply are : 
+5
-5
+12
-12
and "power good"

-- 
Dennis Lou           || "But Yossarian, what if everyone thought that way?"
dlou@ucsd.edu        || "Then I'd be crazy to think any other way!"
[backbone]!ucsd!dlou |+====================================================
dlou@ucsd.BITNET     |Steve Jobs and Steve Wozniak went to my high school.