Help with a Pac PCB hack..need some splaining.

[WunderCade]

Can someone decipher the PCB shorthand used in bold for me. I am undertaking this hack, turning my Pacman pcb into a 4 in 1 and don't know what it to make of the abbreviations and explanation. I've bolded the parts I don't understand:

# Modify the board.
You can be as fancy or sloppy as you want. You can stack sockets or make a daughter board or whatever. I simply plugged 28 and 32 pin sockets into the motherboard and bend the legs of the sockets and solder right to them. Then I insert the EPROMs into the sockets.

Also, I did all wire jumps on the component side of the pcb. It's a lot easier to do it on this side of the board, as everything is labeled. Working on the solder side is much more difficult.

   1. Row 6 mod.
      The 27020 is a 32 pin DIP. The socket I used was 6J and is 24 pins. Bend up pins 1, 2, 3, 4, 22, 24, 25, 28, 29, 30,31, and 32. Place the new ROM socket in the pcb socket so that the bottom of the chip (opposite side from the notch) lines up with the bottom of the socket. This means that pin 16 of the chip should go into pin 12 of the socket. If you had not bent up pins 1 through 4 and pins 29 through 32, they'de be hanging off. The actual pcb socket you use isn't important (as long as it's not 6K or 6L). We could use 6E, 6F, or 6H, but the daughterboard in 6D gets in the way.
         1. Connect pins 24 (OE\) and 22 (CE\) to 7N pin 12.
         2. Connect pin 25 (A11) to 7L pin 9.
         3. Connect pin 28 (A13) to 7N pin 14.
         4. Connect pin 29 (A14) to 6B pin 5 (test connector 8th "finger" from the bottom component side). I tapped into it at this side edge connector.
         5. Connect pin 4 (A12) to 7J pin 6.
         6. Solder the wire between pins 1 (Vpp), 31 (PGM\), and 32 (Vcc) to +5 volts. You can tap into this in a number of places. Pin 24 of every ROM socket has 5 volts on it.
         7. NEW: Connect pin 3 (A15) to 8K pin 11.
         8. NEW: Connect pin 2 (A16) to 8K pin 10.
         9. NEW: Connect pin 30 (A17) to 8K pin 9

   2. Row 5 mod.
      The 27128 is a 28 pin DIP. Bend up pins 1, 2, 20, 22, 23, 26, 27, 28 on a 28 pin socket. Put the new socket into the pcb socket at 5E or 5F. Again, it doesn't matter which.
         1. Connect pins 22 (OE\) and 20 (CE\) to GND. You can pick up GND at pin 12 of any of the ROM sockets. You can also use pin 14 of the 27128 or pin 16 of the 27010. GND is always the top right pin of the EPROM (if you are facing the component side of the pcb with the edge connector towards the ceiling).
         2. Connect pin 23 (A11) to 4F pin 1.
         3. Connect pin 26 (A13) to your game select switch or pin 2 of the added 27020.
         4. Connect pin 2 (A12) to 5L pin 5.
         5. Connect pins 1 (Vpp), 27 (PGM\), and 28 (Vcc) to +5 volts. I just connected pin 1 to pin 28. I then globbed solder between pins 27 and 28. Then, I soldered another wire from the glob to pin 24 of another ROM position (5H).

   3. Check your work, and fire it up!

[RetroACTIVE]

OE/ is Output Enable NOT (active low)...
CE/ is Chip Enable NOT (active low)...
A11 is Address bit 11
A13 is Address bit 13
A14 is Address bit 14

I believe the test connector is the connector on the side of the pacman pcb... (not the connector the cabinet connects to)

Vcc is your +5 volt logic supply voltage
PGM/ is program NOT.... active low program enable.
Vpp is the programming voltage for the device (usually > 5 volts and not generally used by the pcb but by device programmers)

The schematic \ datasheet will have these clearly labeled so you can cross reference them... see pic below of what they would look like on the schematic.