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  1. Nebula

    Asayuki's logic comparator Clone

    Unfortunatelly, logic comparator doesn't work with ICs with bidirectional pins (i.e. pins that are changing between acting as input or output over time). That's why you are getting inconsistent results, because the instant when some pin is acting as an input (and thus produces an output at the...
  2. Nebula

    Capcom CPS1/1.5: Regional Differences in Games

    Also in SF2CE and SF2HF japanese version there is a dip switch setting to allow "versus" play (1p vs. 2p) with only one coin. The game is over after battle ends, even for the winner. Only present in japanase versions
  3. Nebula

    Fixed! - Was: Need a ROM file to repair a Super Contra...

    Congrats! That was a hard one… again, Fujitsu curse on those Konami boards
  4. Nebula

    Have you seen this little daughter board on a cps2?

    That's simply a rom board to extend the Q-Sound rom space, because there is only 2 slots in the main B board dedicated to that. Some games use that to allocate more sound data space.
  5. Nebula

    Help identifying a coil on Nanao MS9 board

    This is what appears in the manual for Coil L504: EDIT: I see you already look at it on the manual... Unfortunately, there is no additional info for that...
  6. Nebula

    Modifying a 92631C-6 (Battery-less B-21 C-Board) to work like a 90631C-5 (Battery Backed B-21 C-Board)

    They are probably 0.1u, as any other decoupling cap along the other pcbs. There is nothing silkscreened on them, just brown color.
  7. Nebula

    Part identification please...

    They are 32k x 8 SRAMs in dip28 package
  8. Nebula

    Need an answer

    it is a modified MVS system dedicated to be installed into photo booths. It also has their own cartridges to be used into it. One of them is the one you show in pictures. More info here: and here...
  9. Nebula

    Need an answer

    It's a neo print cartridge, probably undumped yet
  10. Nebula

    Yoke and tube specs for monitors

    You can use a 3.3 Ohms 1W for that. But only if you plan to use the MS9 chassis. I don’t really know about Toshiba PB chassis
  11. Nebula

    Yoke and tube specs for monitors

    Comparting that with the values of that resistor in the MS9 paired with Toshiba tube, and the one paired with Hitachi tube, that doesn't make much sense... I presume it should be: Brn-Grn-Gold-Gold, that is 1.5 Ohms, and that matches with the resistor in MS9 paired with Hitachi tube (KSA), so...
  12. Nebula

    Yoke and tube specs for monitors

    I was checking my old notes and I saw that the heater voltage is different between tubes A68KSA30X and A68KJU96X and therefore there is a different heater resistance in the chassis paired to each tube. Really don't know about the Matsushita one, but you could check the value of R532 in your...
  13. Nebula

    Yoke and tube specs for monitors

    As far as I know, each one uses a different heater resistance, so apart from yoke specifications, also take care of that.
  14. Nebula

    Big Jamma Sale - Everything must go.

    pm for Extreme Downhill pcb
  15. Nebula

    PGM single game PCB assembly and troubleshooting

    yeah, I understand it but, how bad is it considering there are also ROHS DIP Sockets with round holes?: Are those also not recomented for EPROMS and GALs?
  16. Nebula

    PGM single game PCB assembly and troubleshooting

    Uhm this is interesting. What's the cause? Do they end up to make poor contacts in the EPROM legs after some time?
  17. Nebula

    PGM single game PCB assembly and troubleshooting

    Thanks @Mrhide . I'm Europe based, so Digikey is not suitable only for this. But I found those ones that maybe fit for this also. They are really low profile:
  18. Nebula

    PGM single game PCB assembly and troubleshooting

    Hi guys, Could someone point me up a website or shop to buy those low profile sockets I saw you used for the CHAR board? Those rounded ones that allow the cartridge case be closed without problems. Thanks in advance.
  19. Nebula

    Jaleco Mega System 1, testmode?

    I managed to spot the faulty component. It was a LS374 in the middle of Sprite/Object RAM and Palette RAM custom, as @Hammy said. Thanks! Replacement manufactured back in the day by our dear Iberian neighbours :D: And now works fine!