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Thread: Neo Geo unibios install issue

  1. #1
    Krauser's Shoe Shiner
    Evan's Avatar
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    Neo Geo unibios install issue

    I was trying to install a unibios using the piggyback method. When I was done the screen showed a garbled mess with one screen with different colors. There is also a slight popping sound when it is running. It seems to be resetting itself. If anyone could have a answer to this it would be appreciated.
    https://drive.google.com/file/d/1tlK...w?usp=drivesdk
    https://drive.google.com/file/d/12tX...w?usp=drivesdk
    https://drive.google.com/file/d/1_-L...w?usp=drivesdk

  2. #2
    drunk downunder!
    aka. Muff Diver.
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    You really should just get yourself an inexpensive solder pump and remove the old chip...



    !!

  3. #3
    Somewhere in Europe.

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    Quote Originally Posted by Evan View Post
    I was trying to install a unibios using the piggyback method.
    Out with the BIOS, in with a socket. From this angle it's hard to see what exactly could be wrong, but seeing as the soldering is a bit messy, maybe there's a short?

  4. #4
    Krauser's Shoe Shiner
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    Yeah, I ordered a socket and this weekend I should have time to remove the bios. After that I will instead just install a socket.

  5. #5
    Divine Hand of the UniBIOS
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    The screens show something went wrong with the install. Below might help you if its still not working after socket install. Also, once you got the bios off the PCB take some photos so you understand where traces go that were under the bios.

    Code:
    This info is taken from NEO-AES3-6 and NEO-AES3-4 revision boards
    and should be valid for all boards that have the bios to the right
    of the cart slot. The older board NEO-AES which has the bios
    above the cart slot is partly different.
    
    * The 43256 (work RAM) closest to P1 joystick port
    
    1----5V
    2----GND
    3----68000-12 (54), LSPC2 (21), NEO G0 (50)
    4----68000-12 (55), LSPC2 (20), NEO G0 (49)
    5----68000-12 (56), LSPC2 (19), NEO G0 (48)
    6----68000-12 (57), LSPC2 (18), NEO G0 (47)
    7----68000-12 (58), LSPC2 (16), NEO G0 (34)
    8----68000-12 (59), LSPC2 (15), NEO G0 (33)
    9----68000-12 (60), LSPC2 (14), NEO G0 (32)
    10---68000-12 (61), LSPC2 (13), NEO G0 (31)
    11---GND
    12---68000-12 (62), LSPC2 (10), NEO G0 (18), 43256* (19)
    13---68000-12 (63), LSPC2 (09), NEO G0 (17), 43256* (18)
    14---68000-12 (64), LSPC2 (08), NEO D0 (03), 43256* (17)
    15---68000-12 (01), LSPC2 (07), NEO D0 (02), 43256* (16)
    16---68000-12 (02), LSPC2 (05), NEO D0 (01), 43256* (15)
    17---68000-12 (03), LSPC2 (04), NEO D0 (64), 43256* (13)
    18---68000-12 (04), LSPC2 (03), NEO D0 (63), 43256* (12)
    19---68000-12 (05), LSPC2 (02), NEO D0 (62), 43256* (11)
    20---NEO E0 (59)
    21---68000-12 (29), NEO E0 (64), 43256 (10), HC259 (01)
    22---68000-12 (30), NEO E0 (01), 43256 (09), HC259 (02)
    23---68000-12 (31), NEO E0 (02), 43256 (08), HC259 (03)
    24---68000-12 (32), NEO E0 (03), 43256 (07), HC259 (13)
    25---68000-12 (33), NEO E0 (04), 43256 (06)
    26---68000-12 (34), NEO E0 (15), 43256 (05)
    27---68000-12 (35), NEO E0 (16), 43256 (04)
    28---68000-12 (36), NEO E0 (17), 43256 (03)
    29---68000-12 (37), NEO E0 (18), 43256 (25)
    30---GND
    31---68000-12 (38), NEO E0 (19), 43256 (24)
    32---68000-12 (39), NEO E0 (20), 43256 (21)
    33---68000-12 (40), NEO E0 (21), 43256 (23)
    34---68000-12 (41), NEO E0 (31)
    35---68000-12 (42), NEO E0 (32)
    36---68000-12 (43), NEO E0 (33)
    37---68000-12 (44), NEO E0 (34)
    38---5V (N.C. on NEO-AES3-4)
    39---5V
    40---5V
    
    Fault checking.
    
    
    If for some reason the system no longer works then obiously some traces
    have broken, check everything.
    
    If the Bios is working but you get a memory card error on power up if a
    memory card is inserted and a card protected error while trying to format
    a memory card then one or more of the socket to NEO E0 traces have
    broken (pin 20 to 37).
    THE UNIVERSE BIOS ( MVS / AES, and now also for CD )
    www.universebios.com. Also on facebook, please like http://www.facebook.com/UniverseBios.

  6. #6
    Krauser's Shoe Shiner
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    When I was desoldering the bios, I messed up and desoldering some of these small holes. I was wondering, does that mean anything and is there a picture to see how they should be?IMG_20180223_193415.jpg

  7. #7
    Crossed Swords Squire

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    Those are vias. The ones that would have had solder in them will still have a bit of solder left. You wouldn't have been able to remove it all. Honestly though you could solder any of the open vias without concern.

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