ScuzzBlog: Diaries September 2021
Entry 16th September 2021: Post 1: C64 Luma Chroma 1701 TTL RGB CVBS LCA 1081.
C64 Luma Chroma 1701 TTL RGB CVBS LCA 1081.
Well this is embarrassing. I took the first part of this image set
over three months ago in answer to a query regarding Luma and Chroma.
The guy was trying to establish the pin-outs on the C64 video socket
and what the respective colours of the cables meant. This lead to
a discussion about CVBS and LCA modes as found on various monitors
of the day produced by Commodore/Philips.
I had dragged out this old banged up C64 to show the 8 pin connector
on the back of the C64 plus some monitor manuals to show the type
of connectors and the specific pin references. I also show the
connector for the Commodore 1701 which splits off the luma and the
chroma to the back of the monitor. This identifies the colours of
the various individual connectors/cables.
So when I returned to this image set I had forgotten completely the
purpose of the exercise, and I am still baffled. I just used the
pictures to show the various connectors on Commodore monitors and
the front panel to the 1701. Somewhere in the muddle there was a
discussion about CVBS and LCA and 8 pin TTL RGB, but honestly it
has been so long ago I forget. All the information is on the pages
shown so its all there for the reading.
I dragged out this banged up very old Amiga 1081 monitor which best
shows all the various connectors available in the day. Fortunately
it has a SCART which connects very nicely to the C64. This monitor
was covered in tape and had the button rammed in with a bit of wood
and stuck down. I've cleaned off most of the tape but the button is
well and truthfully stuck. To get this monitor to work requires a
clever 'jiggle' of the left most knob on the front of the monitor.
It really is a skill to get her working. I didn't fiddle with the
colours but she can look a lot better than shown.
Shame she's so banged up in truth, always been like it. Sad really.
Under the monitor is this strange gizmo that arrived with one of the
VIC 20 machines. The owner had rigged up the video to serve the VIC
and another bit of kit. Seems that the box takes the RF TV connector
and I assume acts as a modulator. My guess is that it has the VIC
modulator inside. Never taken it apart.
Anyhoo that was a blog loosely about how to connect a Commodore 64
to a Commodore monitor. Or not.... probably not. Going now.
C64 Luma Chroma 1701 TTL RGB CVBS LCA 1081.
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