CRTC 6545/6845 information

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  2013-11-02 Moved the description of the different modes of operation from the diffs page to the CRTC operation page. Added the C64 80 column card and hires mode descriptions to the CRTC system integration page.
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  2013-05-02 Added the Colour PET description
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  2011-04-25 Added a link to the 8032-SK page.
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  2010-12-20 Reorganized the CRTC pages, added the systems integration page (separated from the CRTC operations page, and moved the composite video signal generation here to a separate page.
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  2007-02-02 Added information on the CRTC status register.

• General operation This document describes the general CRTC operation, as well as the register file.
• CRTC differences This document describes the differences between a number of CRTC implementations from Rockwell, MOS, and others.
• CRTC system integration This page describes how the CRTC is integrated into the system, how memory is connected, video output is shifted out and so on.
• CRTC internals This document describes the internal structure of the CRTC. I.e. it tries to show the internal CRTC counters, compares, etc. It explains in greater depth how the CRTC works.
• Composite video signal generation Generate composite video signals from the CRTC output, to use as input for a normal TV set.
• Test programs This page shows a number of test programs and the results that they produce on a Commodore PET. The test programs create "raster-effects" by using the CRTC interrupt in the PET to dynamically change the register values.
• CS/A VDC An example of a CRTC-based video card. Also contains schematics to create PAL composite video from the board's output.
• Creative use in a 8032-SK An example of a creative use of the CRTC, by connecting some otherwise unused video RAM address lines with the character generation ROM.

Here are links to CRTC-related projects.

• NO PETs Allowed demo!