The following text was copied from the C=Hacking magazine, issue 20.

................................... Jiffies ..................................

$01 Not _too_ long ago, an effort was made to write down the pin assignments
    for the video port of all the major C= computers.  The result, as compiled
    by William Levak <wlevak@cyberspace.org>, is:


            8              7
Commodore          6           Video Connector
            3              1
 
              5         4
                   2
                                                    Plus4     C16/C128
     CBM-II      VIC20     VIC20CR    C64     Pin C64A/SX64   C64B/C/E
    --------- ------------ ------- ---------- --- ---------- ----------
(R) Luminance +5 V         +5 V    Monochrome  1  Monochrome Monochrome (Y)
    Ground    Ground       Ground  Ground      2  Ground     Ground
(B) V. Sync.  Audio        Audio   Audio       3  Audio      Audio      (W)
(W) Video     50 Ohm Video Video   Video       4  Video      Video
(Y) H. Sync.  Video        Video   Audio In    5  Audio In   Audio In
                                               6  Chroma     Chroma     (R)
                                               7
                                               8             +5 V