C64/C128/VIC-20 ProtoCart board notes v0.1 05/24/2011
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The VIC-20 Expansion port edge connector at one end of the board also serves as a C64/C128/VIC-20
 User Port connector when a suitable female edge connector is soldered to it.  However, to avoid
 short-circuiting certain signals, it was necessary to isolate the +5v power rail from one end of
 the VIC 20 Expansion/C64 User Port edge connector.

First, place the board with the top side of the board facing up, and the VIC 20/User Port card edge
 to the left (C64 Expansion card edge to the right, DSUB connector at the far edge).

Locate pins 1 and 2 (at the edge closest to you), and pins 21 and 22 (far edge).


To use on the VIC 20 Expansion Port:
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Looking at pin 22, you will find the pin number written next to it, then an arrowhead to the right
 of that, and to the right of the arrowhead is a via (among many obviously).  This via is the +5v
 power rail on the board, which you can confirm by looking at the bottom side of the board.  Simply
 run a jumper wire from pin 21 to this via.  If you look at the bottom, you will also note that this
 rail leads to pin Y - this is due to a layout error, but that pin is not connected in the VIC-20.


To use with the VIC, C64, or C128 User Port:
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Locate pins 1 and 2, and note on the top of the board how pin 2 has a thick trace leading to a via
 near pin 1.  This is the User Port's +5v rail.  To the right of that via is another via, which is
 the +5v rail on the prototyping board (again, you can confirm this by looking at the bottom of the
 board).  In order to supply power to that rail, you will need to connect a short jumper wire between
 these two deliberately-separated vias.

Once this wire is added, you will need to solder on an appropriate female edge connector to the edge,
 starting at pin 1.


To use with the C64 Expansion Port:
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Another layout error was made here, where the C64's expansion connector is a little too short to reach
 all the way into a C64/C128, though it works fine in a Cartridge Port expander such as the XPansion-3.
 If, however, you wish to use this directly in a C64/128 Expansion Port, and you didn't opt to have
 the board trimmed, doing so is fairly straightforward.

First, locate the top-right corner of the board, immediately to the right of the DSUB connector. Along
 the right edge, leading from this corner to C64 Expansion Port connector, there are four columns of vias
 situated between the edge and the DSUB connector.  You will need to cut the board parallel to the edge,
 along the space between the 2nd and 3rd columns, essentially trimming off the power rails.  Then clip
 the piece off flush with the C64 Expansion connector(http://www.c64world.com/protocart/img8.jpg green rectangle).