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From: dvsg0223@uxa.cso.uiuc.edu (David Salamon)
Newsgroups: comp.sys.amiga.hardware,comp.sys.amiga.marketplace,misc.forsale.computers
Subject: Re: Wanted: Amiga 1000 power supply and what is the "tick" line???
Keywords: Needed A1000 Power Supply!!!
Message-ID: <1991Mar13.003325.1993@ux1.cso.uiuc.edu>
Date: 13 Mar 91 00:33:25 GMT
References: <58@swpyr2.sbc.com>
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Organization: University of Illinois at Urbana
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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.

David