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From: erd@tut.cis.ohio-state.edu (Ethan R. Dicks)
Newsgroups: comp.sys.amiga
Subject: Re: making composite video better...?
Message-ID: <682@tut.cis.ohio-state.edu>
Date: Mon, 26-Oct-87 00:09:49 EST
Article-I.D.: tut.682
Posted: Mon Oct 26 00:09:49 1987
Date-Received: Thu, 29-Oct-87 05:18:19 EST
References: <1312@atkins.munsell.UUCP> <2590@cbmvax.UUCP> <1709@charon.unm.edu>
Organization: The Ohio State University Dept of Computer and Information Science
Lines: 40


-------- eat me ----------

I have such a product, but I do not have the installation instructions as
of yet :-(

The solution that I bought, long ago, is the board and cable from Digitek,
a purveyor of C-64 hardware.  I have not installed it yet, because I bought
it from a friend who had a 1701, but never installed the board.  I have a 1702
and the monitor circuit boards are different.  With the Digitek board, you
solder a cable with a DB9 on one end through a hole in the monitor to their
board, and then solder some wires to the circuit board in the monitor.  I
checked the cable from the computer to the board and apparently, the intensity
signal is not wired, giving 8 colors, not 15.  There are two other hitches with
their product.  The first drawback is that in the ORIGINAL instructions, the
installation procedure instructs you to remove one of the RCA style jacks from
the panel on the back of the monitor.  This disables the CHROMA-LUMA data input
set and the switch on the monitor switches back and forth between NTSC and
RGB inputs.  Digitek's technical support number provided me with an alternate
set of installation instructions which permit, with some restrictions, all
THREE input sets into the monitor.  The other drawback is the sync signals are
inverted from the Amiga.  One looks for negative logic sync and the other looks
for positive logic sync.  If you look on the back of a 1080 monitor, there are
switch positions for both.  I have built a DB23 to DB9 converter box with
optional sync logic inverters (switch selectable), but after a month of
waiting, I still have no installation instructions.  I will post on the net
the results of my efforts, if this topic generates any interest.

For specific product detail, contact Digitek at (813) 933-8023 (in Tampa FL)

Disclaimer:  I am not even happy with them and I still am recommending them.
		(with a capital CAVEAT EMPTOR)

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...cbosgd!tut!erd
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