Path: utzoo!attcan!uunet!cbmvax!daveh
From: daveh@cbmvax.commodore.com (Dave Haynie)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Can an IBM power supply live on an Amiga 2000?
Message-ID: <15799@cbmvax.commodore.com>
Date: 12 Nov 90 16:21:17 GMT
References: <7652@cica.cica.indiana.edu>
Reply-To: daveh@cbmvax.commodore.com (Dave Haynie)
Distribution: na
Organization: Commodore, West Chester, PA
Lines: 26

In article <7652@cica.cica.indiana.edu> graham@venus.iucf.indiana.edu writes:
>In article <90313.094443MBDZM@ROHVM1.BITNET>, MBDZM@ROHVM1.BITNET writes...
>>Can I hack an IBM a/t supply (about $50) to work?

>Yes you can.  I've done it.

>>The voltages seem to
>>be ok +5, -5, +12, -12, but there is a line marked "TIC". That is the one
>>I can't figure out.  Is it there on the IBM supply? Can I fake it?

>Darn! Wish I had my notes with me.

The TICK line is a 50/60Hz output clock from the line.  Since in most areas,
the power line frequency is regulated for use with clocks, the Amiga's
run-time clock gets its timebase from this.  It is possible to run an A2000
using the VSYNC line (which is a tad under 60Hz on an NTSC system) instead
of TICK by changing the J300 jumper, which is between the U300 CIA chip and
the Paula chip on the motherboard.  The A500 always uses this for its
timebase, and it works, its just not as accurate as the line voltage.



-- 
Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests"
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	Standing on the shoulders of giants leaves me cold	-REM