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From: dca@kesmai.COM (David C. Albrecht)
Newsgroups: comp.sys.amiga
Subject: Re: TTL -> Amiga
Keywords: hardware, monitors, TTL, interlace
Message-ID: <210@kesmai.COM>
Date: 28 Apr 89 21:13:57 GMT
References: <11373@well.UUCP> <10471@cit-vax.Caltech.Edu>
Distribution: na
Organization: Kesmai Corporation, Charlottesville, VA
Lines: 36

In article <10471@cit-vax.Caltech.Edu>, bdiscoe@tybalt.caltech.edu (Ben W. Discoe) writes:
> In article <11373@well.UUCP> jimbo@well.UUCP (Jim Bolton) writes:
> >
> >[Stuff about wanting to use a TTL level monitor to the Amiga]
> 
>    There (is/may be) a commercial product that not only will connect your
> Amiga to such a monitor but remove interlacing as well!  They also claim
> it passes the RGB port and works on any Amiga.  The weird thing is, although
> they:
>      Hypertek/Silicon Springs        (the makers of GOMF)
>      205-2571 Shaughnessy Street
>      Port Coquitlam, B.C. CANADA
>      V3C 3G3
> 
> have advertised this "TTL monitor interface" with a price of $99 for a LONG
> TIME in Amazing Computing, I fear this product remains VAPORWARE.  I wrote
> them a list of questions about the device, and received a "thank you for
> your interest in our product" letter, which basically admits it didn't
> exist at that time.  (3-4 months ago)
As far as I know of the product does exist.  But then it isn't much.
It doesn't de-interlace the signal going to the monitor it uses a
TTL monitor which has long persistence phosphors which makes the
flicker much less noticeable.  However, it requires a specific monitor,
a Commdore 1090 I believe (not included in the price),
which you then have to go inside and hack so
that it can be driven by a RGB analog type signal rather than by the
digital values.  Other than that, it is mostly a cable.  Any amiga has
digital RGBI coming out the back so you can hook up a TTL monitor directly
but getting something that produces readable output for your typical
4 level monitor is a little iffy.  I also had to go inside the monitor
and adjust it to get reasonable height since the scan rates differ
between normal TTL and the Amiga's CGA rates.  Be forewarned, the signal
voltages inside a video monitor are nothing to mess with if you aren't
pretty savvy about electronics and servicing.

David Albrecht