Piggyback-socket.txt Guest on 6th April 2021 09:36:57 AM
  2. -----------------------------------------------------------
  4. These instructions give a method of installing a UNIVERSE BIOS that is alot easier than
  5. installing a socket directly to the PCB, soldering is still required though. To do
  6. this you will need the following before you start;
  8.  - A Philips screwdriver.
  9.  - A 40pin DIP Socket.
  10.  - A soldering iron and solder.
  11.  - A 15K 1/4 watt carbon resistor.
  12.  - A small piece of wire.
  14. NOTE. You can also do permanent damage to your NeoGeo if you damage the PCB in any way.
  15. Only do this if you are confident you can do it correctly, I take no responcibility
  16. for damage caused to your AES by following these instructions.
  18. -----------------------------------------------------------------------------------------
  20. Read through the following instructions a few times so you are sure you understand them
  21. before you start the process,
  24.  - Remove the AES's protective casing (4 screws, 3 are located under the rubber raisers).
  26.  - Locate the BIOS chip (it will either be above left or below right of the cart socket).
  27.    The chip will normally have '531024' written somewhere on it.
  29.  - Look at the chip carefully, you will notice a half circle cut into the side of it. Use
  30.    that notch and the picture below to understand the numbering of the pins (pins 1 to 20
  31.    on bottom counting left to right, 21 to 40 on top counting right to left).
  33.        40                                     21
  34.         n n n n n n n n n n n n n n n n n n n n
  35.         ---------------------------------------
  36.         |                                     |
  37.         |                                     |
  38.          >                                    |
  39.         |                                     |
  40.         |                                     |
  41.         ---------------------------------------
  42.         u u u u u u u u u u u u u u u u u u u u
  43.        01                                     20
  45.  - Carefully cut pin 2 of the BIOS already attached to the PCB as close to the board
  46.    as possible and bend the pin out straight parallel with the PCB. Be careful not to
  47.    damage the PCB in this process.
  49.  - Bend Pin 2 of your 40pin DIP socket out also in the same manner, remember to have
  50.    the socket the correct way around (notch on the left).
  52.  - Place the 40pin DIP socket on top of the existing bios chip and make sure all pins
  53.    are aligned correctly and overlapped. If done correctly pin 2 on original bios and
  54.    socket will be straight out and not touching each other.
  56.  - Using your soldering iron go around and solder all 39 of the 40pin DIP socket to the
  57.    39 pins of the original BIOS. Do not use to much solder and make sure you don't join
  58.    neighboring pins.
  60.  - Take the resistor and solder one end to pin 2 of the original BIOS (the bottom one).
  61.    Bend the resistor around and solder the other end to pin 40 of the stack (this pin
  62.    is already soldered to the pin under it, just solder anywhere here to join it).
  64.  - Use a small length of wire and solder one end to pin 2 of the 40pin DIP socket. Then
  65.    solder the other end to pin 20 of the stack (this pin is already soldered to the pin
  66.    under it, just solder anywhere here to join it).
  68.  - Now push the Universe Bios into the socket making sure its the correct way around.
  70.  - In theory as long as you made no mistakes the installation is now complete. As a quick
  71.    test you can power on the unit with no game inserted, if all is correct you will be
  72.    presented with a blue screen. If there is a problem you will probably get some sort of
  73.    screen with garbled flickering graphics. If this is the case then go through these
  74.    instructions again double checking everything.
  76.  - Reassemble the system.

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