Local copy of http://www.c64.priv.no/c64/files/repair_pinouts.txt

made 2 Dec 2001.


           latest corrections and/or additions: 01-21-99


Here is the A/V connector pinout for the VIC20. It is shown facing
the rear of the computer:

           audio out -----3         1----- + 5 volts 

 comp video out (high)-----5       4----- comp video out (low)
                               2----- ground

Notice that the video output is on two pins. They are the same (wired
together inside the computer) on some versions, and output a slightly
different signal level in others. Use pin 4 for interfacing a video 
monitor such as the 1702. 
Note: be careful of the +5 volt line! It's there to source power to 
the -external- RF monitor used with the VIC20. 


Here is the pinout for the C128 computer power connector. It is shown
facing the rear of the computer. The C128 supply is a switcher and has
two outputs: 5 volts DC at 4.3 Amps, and 9 Volts AC at 1 Amp. Note: the
metal shell of the plug is also a ground.

       GROUND -------4         3----- 9VAC
                          5---------- 9VAC

           +5VDC -----1       2----- NO CONNECTION


C64 A/V Connector

Here is the A/V connector of the C64 and C128 shown facing the rear of
the computer. Note that early versions of the C64 have a 5 pin DIN 
connector while later versions have an 8 pin. The two are wired exactly
the same, except that the 8 pin connector has a separated chroma (color)
output... earlier C64's couldn't do separate Y - C video. Note the "U"
shape of the connector pins. It's different than the circular pattern
of the RGB connector on the 1902A monitor, for example.

  see note below -----8             7-----no connection
                             6---------chroma out
       audio out -----3             1----- luminance (B & W signal)

          audio in -----5         4----- composite video out
                             2----- ground

Important note: the later C64C and the C128 both have a power supply
line going to one of the "unused" pins: pin 8. Be careful!!!


The power connector pinout for the C64 is shown facing the right side
of the computer: 

         9VAC -----7         6----- 9VAC

      ground -----3           1----- ground

        +5VDC -----5         4----- +5VDC or no connection
                        2----- ground

Note: although only four pins are actually used, the power connector 
is a 7 pin DIN, as shown. 


The 1902A monitor has several connectors: an 8 pin DIN (like the C64
power connector) for RGBI (80 columns), a 6 pin DIN (like the C64
serial connector) for Y/C video, an RCA jack marked CVBS for composite
video, and an RCA jack for audio. The pinouts of the DIN jacks are
viewed facing the rear of the monitor. The first one is the RGBI
connector for TTL 80 column color (or 80 column monochrome video).
Notice the circular arrangement of the pins. It's different than the
"U" shape outline of pins on the C64/128 A/V connector.

     mono (80 columns) -----7         6----- ground
                                 8------------- no connection
                green -----3           1----- no connection

             intensity -----5         4----- blue
                                 2----- red

To interface the above connector to your C128, the pinout for the other 
end of the cable is a 9 pin D, as follows. It is shown facing the rear 
of the computer:

1 ground                  \  5  4  3  2  1  /
2 ground                   \               /
3 red                       \  9  8  7  6 / 
4 green                      "-----------"
5 blue
6 intensity
7 monochrome (composite) video
8 horiz. sync
9 vertical sync

            * * * * * * * * * * * * * * * * * * * * * * * * 

The pinout for the monitor Y/C DIN connector is shown facing the rear
of the monitor:  

         no connection -----5         1----- no connection

                                 6--------luminance and sync (Y signal)
    chroma (c signal) -----4           2-----audio

                                 3----- ground

To interface this to a C128 or a C64, you need an 8 pin DIN connector, 
on the other end of the cable, wired as follows (shown facing rear of

    no connection -----8           7----- no connection
                             6--------- chroma (C signal)
        audio out -----3           1----- luminance and sync (Y signal)

           audio in -----5       4----- composite video

Note: this DIN connector has a "U" shaped arrangement of pins. Don't 
confuse it with the alternate "circular" 8 pin arrangement as used on 
the CBM 1902A monitor. 


S Video

This is the pinouts for an SVHS (also called S-video) connector. It is
shown facing the rear of the monitor/TV or VCR. The connector is a four
pin mini DIN. Note the "keyway" at the bottom.

   CHROMA (C) IN/OUT -------4       3-------- LUMINANCE (Y) IN/OUT

      CHROMA GROUND--------2         1-------- LUMINANCE GROUND
The luminance is the black and white information with sync. The chroma is
the color information. Separated Y and C produces a better picture on the
monitor screen than composite (single wire) video. To connect the Y/C
output of a C64 or C128 to a Y/C monitor or TV, take the Y output of the
computer (see 8 pin DIN AV output diagram) and connect it via a shielded
cable to pin 3 of the miniDIN connector. Take the C output of the
computer and connect it to pin 4 of the monitor. Don't depend on the
metal shell as a ground connection between devices... some cables do not
use the shell as a shield. Use the Y and C grounds, pins 1 and 2
respectively for the grounds on your shielded cable(s). Of course, audio
should be included in your hookup from the computer to the monitor. 


This is the pinout the 1581 power connector. It is shown facing the
rear of the drive. Note that the same power supply is used for the
1541-II and the 1571-II. The supply puts out two voltages: 5 volts DC
at 1 Amp and 12 volts DC at 1/2 Amp. 

          +12VDC -----O       O----- +5VDC

    no connection -----O     O----- GROUND