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Dive into the retro feeling and build yourself a Commodore PET replica

Need more speed? Speed up your 6502 computer with this 10 MHz 6502 CPU replacement board

Interested in electronics design? Look at the design lesson I got from Bil Herd, the hardware designer of the C128

CRTC 6545/6845 information

The pages linked here describe the operation of the CRTC 6545/6845 chips.

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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 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.
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.

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