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Thread: Neo Diagnostics ROMs

  1. #226
    Kuroko's Training Dummy

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    Quote Originally Posted by Razoola View Post
    The bios is failing its self check.

    Raz
    Any ideas of the cause? BIOS itself works fine in other systems, so it's a failure in the MVS hardware. Just not sure where it is...

  2. #227
    Divine Hand of the UniBIOS
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    Quote Originally Posted by Kujako View Post
    Any ideas of the cause? BIOS itself works fine in other systems, so it's a failure in the MVS hardware. Just not sure where it is...
    If your sure the EPROM is not failing then its either going to be the 68k or something interfering with the data lines. Do you have known working game carts. If so get to the UniBios main menu, hilight the game cart check then hold start and press the A button. This will test the bios again with a stronger check. See if it always passes or sometimes fails. Then do the same check with a game cart and see if that sometimes passes and then other times fails.
    THE UNIVERSE BIOS ( MVS / AES, and now also for CD )
    www.universebios.com. Also on facebook, please like http://www.facebook.com/UniverseBios.

  3. #228
    Kuroko's Training Dummy

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    Quote Originally Posted by Razoola View Post
    If your sure the EPROM is not failing then its either going to be the 68k or something interfering with the data lines. Do you have known working game carts. If so get to the UniBios main menu, hilight the game cart check then hold start and press the A button. This will test the bios again with a stronger check. See if it always passes or sometimes fails. Then do the same check with a game cart and see if that sometimes passes and then other times fails.
    Well that's just it, all carts work. I see this error about 75% of the time, but if I just hit <A> to resume, it carries on and everything works. Once I bypass the error, there is no sign that there's any problem. Unless I allow the hardware test to complete, then it's bricked. So to avoid that I have the battery pulled and UNIBIOS defaults to not running the tests.

  4. #229
    JammaNationX
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    Quote Originally Posted by Kujako View Post
    Well that's just it, all carts work. I see this error about 75% of the time, but if I just hit <A> to resume, it carries on and everything works. Once I bypass the error, there is no sign that there's any problem. Unless I allow the hardware test to complete, then it's bricked. So to avoid that I have the battery pulled and UNIBIOS defaults to not running the tests.
    He's not telling you to test the carts, the test he's telling you to do is to test the bios itself which uses the CRC check that is normally used for checking the game carts.

  5. #230
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    Quote Originally Posted by Xian Xi View Post
    He's not telling you to test the carts, the test he's telling you to do is to test the bios itself which uses the CRC check that is normally used for checking the game carts.
    Yes. And the BIOS works fine in other MVS boards. I have tested with UniBIOS 3.3 that I burned, UniBIOS 4 which I purchased, and and a backup copy of UniBIOS 4 that I burned. All work the same, failing at times in this system and working perfectly in others. Unfortunately, I do not have a copy of the original 1FZ BIOS or I would test with that as well. I had hopped that the NeoDiagnositcs BIOS and cart' would tell me something, but they say that everything is working... I THINK that the problem is with the watchdog timer. But at a loss as to how to confirm that.

  6. #231
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    You have not read properly my post properly and your also going off the premise that if the game looks to run fine then it runs fine. That is not a good way to check that faults of this nature. Read my post again and do the checks I suggest in the way I suggest using the gamecartcheck menu. Well unless your happy with the fault as it is now and simply skippig it every time it happens.
    THE UNIVERSE BIOS ( MVS / AES, and now also for CD )
    www.universebios.com. Also on facebook, please like http://www.facebook.com/UniverseBios.

  7. #232
    Kuroko's Training Dummy

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    Quote Originally Posted by Razoola View Post
    You have not read properly my post properly and your also going off the premise that if the game looks to run fine then it runs fine. That is not a good way to check that faults of this nature. Read my post again and do the checks I suggest in the way I suggest using the gamecartcheck menu. Well unless your happy with the fault as it is now and simply skippig it every time it happens.
    You are correct, I missed your recommendation for a more detailed check of the BIOS. Will do so when I get the chance.

  8. #233

  9. #234
    Kuroko's Training Dummy

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    Quote Originally Posted by Xian Xi View Post
    Check if the bios on the motherboard has 38,39 and 40 connected to +5v, if not, connect them. That sometimes helps.
    I shall add that to my to do list, which grows faster than it shrinks.

    Back on topic, should I be able to use a neo diagnostics MVS cart on an AES with a converter? Don't have a spare AES cart to swap out the M1 chip on...

  10. #235

  11. #236
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    Quote Originally Posted by Xian Xi View Post
    Of course
    Yup, seems to have worked. However it found no problems. Hurmph, guess I have to break out the logic probe and check traces.

  12. #237
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    neo-batteries.jpg

    This batch of unfriendly venom spewing batteries has given me a headache recently, but nothing that can't be overcome. However, I do have a Z80 COMM issue that I can't seem to get to the bottom of on an MVS2F.

    Using NEODIAG and the Z80 test cart, I get 'EXPECTED C3, ACTUAL 53' - Unexpected IRQ Error 13.

    When booting the Z80 cart it plays the beeps during the NEO GEO splash screen and the built in ROM will plays the sound test OK. However, no sampled sounds are generated in-game.

    Whenever a sound should be played SDW is pulsed, but NMI is not. I've replaced what seems like every chip (Z80, C1, D0, E0, YM2610, 6116)
    this made a difference, but didn't fix the issue.

    I've checked continuity between what seems like every trace.

    Z80 D0..D7 -> NEO-C1 SD0..SD7
    Z80 IORQ (20) -> NEO-D0 IORQ (37)
    NEO-D0 SDZ80R (41), SDZ80W (43), NEO-C1 SDZ80R (84), SDZ80W (85)
    68000 Data Lines -> NEO-C1 SD0~SD7

    I'd like to say thank you to GadgetUK, SMKDan & Furrtek for all of the progress I've made on the other boards so far.

    Is there any chance the firmware to NeoDIAG can be open sourced? I'd like to get an understanding as to exactly what is going on, so I can troubleshoot further.
    Last edited by xterc; 03-21-2019 at 10:50 AM.

  13. #238
    Robert Garcia's Butler
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    I was going to suggest the DAC, until I noticed your earlier point that its showing C3 vs 53 and an unexpected IRQ. Have you tried the SM1- or tried an SM1 bypass to rule it out at least.

    EDIT: Also, is there by chance a G0 connected to that Z80 stuff on that board?
    Last edited by GadgetUK; 03-30-2019 at 03:06 PM.
    My YouTube channel contains some MVS repairs and stuff:-
    http://www.youtube.com/user/GadgetUK164

  14. #239
    Member xterc's Avatar
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    I've replaced the DAC, changed SM1, swapped an E0, G0, C1 & a 257. The Z80 and SM1 have been socketed.

    The BIOS test sounds do play. I'm at a loss with this board.

  15. #240
    Member xterc's Avatar
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    Sound Restored

    Never-mind I figured it out...

    The HC259 addressable latch that drives the OE (output enable) of the NEO-257 needed replacing. It is located in a completely different part of the board than the rest of the Z80/YM stuff.

    The NEO-GEO development Wiki helped again with the following statement 'Multiplexer slot selection from NEO-F0, /OE from NEO-D0 and OE from 74HC259 to NEO-257. The 257 must only output to Z80 when it is trying to read ROM (NEO-D0) and the cart M1/S1 is selected (74HC259).'

    I've highlighted the reference chips in the attached image in case it helps anyone else out.

    HC259-SOUND.jpg

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