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From: hdw@mhtsa.UUCP
Newsgroups: net.micro.cbm
Subject: C64 Ghosts and Audio Input
Message-ID: <355@mhtsa.UUCP>
Date: Thu, 11-Aug-83 10:29:53 EDT
Article-I.D.: mhtsa.355
Posted: Thu Aug 11 10:29:53 1983
Date-Received: Thu, 11-Aug-83 19:21:40 EDT
Organization: Bell Labs, Murray Hill, NJ
Lines: 26


	I have two questions regarding the C64:

1)	I have noticed that when I use certain color combinations
(character and background), I get a ghost of the character immediately
afterwards.  This occurs even with color combinations that are supposed
to be good according to the color combination chart in the PROGRAMMERS'
REFERENCE GUIDE.  An example is using red characters (color code 2) on
a white background (color code 1).  I am using a video monitor.

	Does anyone know if this is the infamous "video sparkle" effect,
a defect in my C64, my monitor, or if it is just something I have to live
with?

2)	In the process on connecting my C64 to a monitor, I noticed that
one of the leads on the audio/video DIN plug is labeled as "audio input".
Checking the schematic in the PROGRAMMERS' REFERENCE GUIDE (Is there
anyone out there actually attempting to use a C64 without the aid
of this document?) I determined that this line is an input to the SID
(synthesizer) labeled "external input".  According to the SID data sheet,
this input is mixed with the output.  Has anyone had any experience
using this feature?  Is it useful?

			Harlan Worchel
			Bell Labs - Murray Hill, N.J.
			mhtsa!hdw  7E-306  582-5411