From: ghazi@wizofhoz.uucp (Ozzie)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Flicker Fixer
Date: 20 Nov 1992 01:13:50 GMT
Organization: Not an Organization

In article <charro.722046978@ee.ualberta.ca> charro@ee.ualberta.ca (Dan Charrois) writes:
>I have a couple of questions regarding a flicker fixer for an A500:
>
>1.  I have heard conflicting reports about the ability of a flicker
>fixer to fit in an A500 case with a CSA MMR accelerator.  I am
>interested in hearing from people who either have both co-existing in
>their 500 (with no problems), or from those who know for a fact that
>they cannot fit together.  (I have a 32 bit daughterboard as well with

	I have a VXL with daughter board, which is about the same size,
occupies the same area as a MMR and an ICD Flicker Fixer 2 on my 500. The
ICD unit is quite small, but even then it will not fit into the 500 with
the VXL or MMR, or not very easily. The VXL/MMR hang over the socket a
Flicker Fixer normally occupies in a 500. You remove the Denise and put it
onto the ICD FF which then goes into the Denise socket, the whole assembly
is about 3/4-1" high, the VXL sits about 1/2" off the motherboard. As you
can see it will not work easily.
	What I did was take 4 24 pin sockets and 6" of a 48 pin ribbon
cable and made an adaptor which brought the Denise Socket out from under
the VXL(the Denise is a 48 pin chip, hence 2(2x24) sockets to make one 48 
pin socket and one 48 DIP adaptor).
	This allowed me to bring the socket out and use the ICD FF 2, but
even then the space in the 500 is too crowded to allow the FF2 assemble to
stay in the 500 without touching something else. But the 6" ribbon cable is
enough to allow this assembly to hang out the back of the 500 case, just
over the RGB Socket. It can be protected by a simple case made of plastic
or heavy cardboard covered in a fine wire mesh(the mesh is a radiation
shield, more to protect other things like TV's from interference).
	Hanging out the back of the 500 doesn't seem to bother it nor is
it unstable, as a matter of fact it makes it easier to do fine tuning to
the FF 2 this way. 

>2.  If the flicker fixer does fit in the A500 with an MMR, does the
>standard A500 power supply have enough juice to power everything?

	Cann't help you here, I use a 150 watt power supply, but it does
not appear to a big power drainer, so it should work with the standard
power supply as long as you aren't at the limit already, like extra
floppies, HardDrives etc..

>3.  I'm a bit confused about what the flicker fixer does with various
>monitor refresh rates.... Would a flicker fixer work fine with my
>existing 1084 monitor?

	I'm fuzzy on this too, but a standard Amiga frame(NTSC) is 262.5
scan lines down, to display a frame with more then this you need to use
interlace. In interlace you get two consecutive frames, one is a half scan
line down from the other during the next scan. What happens is the first
half scan starts to fade before the second starts, so that annoying flicker
when your in interlace. A Flicker Fixer converts two a field interlaced
frame into a single frame with a video signal at 31.5 Khz, twice the scan
rate of your 1084, thus you need a new monitor to use a flicker fixer, one
that scan from 15.75 to 31.5Khz, at least.
	Maybe some of the more knowledgable people reading can expand and
correct me on what really happens.

>If you can offer insight into any of these questions, I'd love to hear
>from you.  Thanks a lot!   Dan
>-- 
>Dan Charrois - University of Alberta, Electrical Engineering
>INTERNET: charro@bode.ee.ualberta.ca 

	Hope this helps you somewhat.

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