Description:
IC5 generates RS-170
NTSC synch. IC1, IC2, and IC3 make up the red, green, and blue video signals that drive
the video encoder section of IC6 to make up the color bars. IC3 is an a divide 2 counter
that drives 4-bit counter IC1. Gates IC2a through IC2b form the R, B, and G, video
signals. IC6 encodes these, plus synch, to form an NTSC video output signal, which appears
at TP12 (Reprinted with permission from Radio Electronics, 7/89, p. 41. Copyright
Gernsback Publications, Inc., 1989.) From figure FD95-7 of Encyclopedia of
Electronic Circuits on CD-ROM Vol. 1.
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