Re: Chroma/Luma (or s-video) Problems on 128DCR

From: Mia Magnusson <mia_at_plea.se>
Date: Wed, 2 May 2018 22:03:55 +0200
Message-ID: <20180502220355.00001669@plea.se>
Den Wed, 02 May 2018 16:02:13 +0000 skrev Terry Raymond
<traymond160@gmail.com>:
> Hi,
> 
> I hooked an older Bread Bin up to my Theatre view TV, only on the
> front panel has the RCA connectors for video and sound.
> 
> If you have just the C64 user manual it has the Video connector
> pinouts, of course use the:
> Video out and Audio out pins, using a multimeter double check which
> pins and the other end is the RCA connectors, see which one is video
> or audio.

The C64 manual, at least the older ones, only has 5 of the 8 pins
documented...

> If you're Monitor cables aren't marked, if you plug Video into Audio
> etc you will blow up the VIC and SID chips.

No way. As long as ground is on the correct pin, VIC can of course
withstand the higher impedance / lower load of an audio input. I don't
think a SID chip would die by loading it with 75 ohm either.

What can kill stuff is connecting and disconnecting stuff while a
ground loop forms between the monitor and the computer (directly on a
C128/C128D with it's grounded PSU, via the disk drive on a C64 with
it's ungrounded PSU). The crappy RCA connectors usually makes contact
with the signal before the ground.

Disconnect all power leads for the computer and all accessories like
disk drives before connecting or disconnecting any cables to be on the
safe side, or run all stuff via a power strip (and don't connect
anything else like a cable TV aerial cable).

> I believe you may only be using the RF anntenna connection but it's
> not very good.
> 
> Use a Commodore monitor cable.

For composite video and audio, any adapter cable intended for hooking
up old european 5-pin DIN audio equipment works fine as long as you use
the correct leads. Those have four RCA connectors and they will be (in
some order) audio out, audio in (don't use this unless you know what
you're doing), composite video out and monochrome video out.

For S-Video which this thread really is about, you need an 8-pin DIN
connector. Make sure to get the right one, there are two different
kinds of 8-pin DIN connectors. One where the pins form a perfect circle
except one pin is missing. The other has five pins in a perfect half
circle but the outer two pins (6 and 7) "sags" outwards. Can't remember
which one C64 uses. IIRC only one of theese two are truly a DIN
connector according to the (west) german DIN standard.

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Received on 2018-05-02 23:00:02

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