Recent content by ack

  1. ack

    AES backup ram mod?

    Has anyone heard of such a thing? The diag bios docs make reference to it, but I don't recall ever seeing anything about one. I'm not even sure why someone would do such a thing.
  2. ack

    Force hard reset of z80 cpu on neogeo

    Assuming the z80 is defunct and not being responsive to REG_SOUND commands (0x01/0x03) is they any way to force a hard reset of it? I would have thought the 68k's RESET instruction would do it, since it suppose to reset external devices, but testing it on hardware it resets the whole board. thanks
  3. ack

    WTB: Broken CPS1 boards

    I started working on getting scans of the different cps1 a/b/c boards. https://www.mvs-scans.com/index.php/Main_Page#CPS_1 I'm hoping to get the bulk of them via non-working boards to save $$. If you have any non-working a/b/c boards you wanna get rid of hit me up. thanks
  4. ack

    REG_PALBANK0/1 register mapping

    I've been working on a project disassembling some neogeo code and came across an inconsistency in documentation with the memory locations that REG_PALBANK0/1 map to. The dev wiki and a lot of example code out there have $3A000F = REG_PALBANK1 $3A001F = REG_PALBANK0 Where as snk docs are the...
  5. ack

    SP-U2 bioses

    I'm looking for 10 to 20 original SP-U2 bioses. If you have 5 or more you can sell I'm willing to offer $3-4 per plus shipping.
  6. ack

    FS: 4 and 6 slot MVS boards

    I got another batch of multi slot boards available. Prices do not include shipping and assume paypal friends&family. If you have any questions or would like a shipping estimate please let me know. MV4 #3 - $135/SOLD MV4 #4 - $135 MV4F #3 - $135/SOLD MV4F #4 - $135/SOLD MV6 #2 - $235/SOLD...
  7. ack

    FS: 4 slots boards and a 6 slot board

    I have 5 fully functional multislot boards for sale. Prices do not include shipping and assume paypal friends&family. If you have any questions or would like a shipping estimate please let me know. MV4 #1 - $135/SOLD MV4 #2 - $135/SOLD MV4F #1 - $135/SOLD MV4F #2 - $135/SOLD MV6 #1 -...
  8. ack

    FS: 2 and 4 slot mvs boards

    I have 4 fully functional multislot boards for sale. Prices include shipping within the USA. MV2-01 - $135/SOLD MV2-01 - $135/SOLD MV4 - $145/SOLD MV4 - $145/SOLD Each board has had some minor repair done to it. If you would like specifics about what was done lmk. All board have Licensed...
  9. ack

    capacitor replacements for mvs boards

    So its trivial to get the needed uF capacitance and voltage rating of the existing capacitors on mvs boards. However what about the other qualities of the capacitor? For example Nichicon caps www.paullinebarger.net/DS/Nichicon/Nichicon%20Series%20Chart.pdf Getting high temp and longer load...
  10. ack

    NeoGeo ROM Preservation Society thread.

    Heres a pic of the 4slot v2 bios. I ended up having 2 of them, both were from MV4 boards. -ack
  11. ack

    WTB: multi slot mvs boards

    Hi I'm looking to purchase the following multi slot mvs boards MV2B MV2FS MV4 MV4F MV4FS MV4FT MV6T The boards need not be working but need to be in decent physical condition (ie no trace patches or other mods). The battery being removed is fine and a little battery damage is ok. Its fine...
  12. ack

    NeoGeo ROM Preservation Society thread.

    Heres a pic of the bios chips. -ack
  13. ack

    MVS carts with frankenstein daughter boards

    Hi I think I got these back in 2011 time frame and kinda forgot about them. I originally thought they were hacks, but re-examining them recently I'm not sure. I have 2 of them and unfortunately both give crosshatch screens Both have the same daughter board which is labeled as "PERFECT LOCK...
Top