Piggyback-bios.txt Guest on 6th April 2021 09:36:14 AM
  2. ----------------------------------------------------
  4. These instructions give a method of installing a UNIVERSE BIOS that is alot easier than
  5. installing a socket, soldering is still required though. To do this you will need the
  6. following before you start;
  8.  - A Philips screwdriver.
  9.  - A soldering iron and solder.
  10.  - A 15K 1/4 watt carbon resistor.
  11.  - A small piece of wire.
  13. NOTE. If you follow this installation method you will void your UNIVERSE BIOS upgrade
  14. option if you have one. You can also do permanent damage to your NeoGeo if you damage
  15. the PCB in any way. Only do this if you are confident you can do it correctly, remember
  16. I take no responcibility 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 UNIVERSE BIOS out also in the same manner, remember to have the
  50.    chip the correct way around (notch on the left).
  52.  - Place the UNIVERSE BIOS chip on top of the existing bios chip and make sure all pins
  53.    are aligned correctly and overlapped. If done correctly pin 2 on both chips will be
  54.    straight out and not touching each other.
  56.  - Using your soldering iron go around and solder all 39 of the UNIVERSE BIOS to the 39
  57.    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 UNIVERSE BIOS (the top
  65.    one). Then solder the other end to pin 20 of the stack (this pin is already soldered
  66.    to the pin under it, just solder anywhere here to join it).
  68.  - In theory as long as you made no mistakes the installation is now complete. As a quick
  69.    test you can power on the unit with no game inserted, if all is correct you will be
  70.    presented with a blue screen. If there is a problem you will probably get some sort of
  71.    screen with garbled flickering graphics. If this is the case then go through these
  72.    instructions again double checking everything.
  74.  - Reassemble the system.

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