JVS Emulator

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    • @Dion This is a little bit of information about the setup:

      Computer working: Macbook Pro 2015 (Mac OS Mojave)
      Computer not working: Raspberry Pi 2 (Ubuntu Mate)
      Arcade Platform: Sega Naomi
      Game: The Maze Of The Kings
      USB to RS485 Converter: amazon.co.uk/DSD-TECH-Converte…ds=usb+to+rs485+converter

      Below is the trace of bytes (in decimal not hex as its a bit easier to read):

      Source Code

      1. ON MAC
      2. ===================================================
      3. GAME NOT YET RUNNING:
      4. SYNC (The Sync Packet)
      5. length 9 (This is the length)
      6. byte 32 (First Data Byte)
      7. byte 2
      8. byte 2
      9. byte 33
      10. byte 2
      11. byte 34
      12. byte 4
      13. byte 37
      14. byte 1
      15. check 158 158 (Checksum check)
      16. GAME RUNNING:
      17. SYNC
      18. length 12
      19. byte 50
      20. byte 1
      21. byte 0
      22. byte 32
      23. byte 2
      24. byte 2
      25. byte 33
      26. byte 2
      27. byte 34
      28. byte 4
      29. byte 37
      30. byte 1
      31. check 212 212
      32. ON RASPBERRY PI
      33. =================================================
      34. GAME NOT YET RUNNING:
      35. SYNC (The Sync Packet)
      36. length 9 (This is the length)
      37. byte 32 (First Data Byte)
      38. byte 2
      39. byte 2
      40. byte 33
      41. byte 2
      42. byte 34
      43. byte 4
      44. byte 37
      45. byte 1
      46. check 158 158 (Checksum check)
      47. GAME RUNNING:
      48. SYNC
      49. length 9 <- This is wrong so the rest is garbage.
      50. byte 50
      51. byte 1
      52. byte 0
      53. byte 32
      54. byte 2
      55. byte 2
      56. byte 33
      57. byte 2
      58. byte 34
      59. CHECK FAILED.
      Display All
      Thanks for looking - Now looking at it I'm wondering if its anything to do with initialisation of variables being different on arm?
    • New

      Little project update / milestone.

      OpenJVS now works successfully with a linux computer, and mostly successfully with a Raspberry Pi. Some games such as Crazy Taxi work with OpenJVS on a Pi, and others like The Maze Of The Kings don't. I think this is due to the fact that the USB bus on the Pi is used for everything, and so I don't think it is replying fast enough to the arcade system.

      The project code is here: github.com/bobbydilley/OpenJVS

      It currently supports a keyboard as the only input device, and reads the keyboard -> JVS input settings from a map file. Now that the project mostly works, I will focus on adding in more input devices (mouse, aimtrak, wheel, joystick) and getting more map files for different games added. Once joystick and mouse have been added, I will make a video detailing how to get it up and running.

      It would be great if someone could give it a go (might have to be a technically minded person, as will require you to setup a Raspberry Pi with linux) and give me feedback on the setup process. I've got a Lindbergh coming soon, so will be good to test it out on that and see if it supports it properly.
    • New

      Would a more powerful mini PC like an Odroid XU4 possibly be able to keep up with the USB traffic maybe? I would not be opposed to even using an actual mini PC.
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    • New

      I'm not that familiar with the RPi architecture, but are the GPIO pins on the USB bus as well? Would there be any benefit to driving the JVS serial communication over GPIO (aren't there a couple of serial-specific pins at GPIO14 and 15?) and reserve USB for input devices? You'd probably have to use some kind of TTL to RS455 (ttl->RS232->RS455?) translator circuit, but it's probably not that complicated. Perhaps there's a simple way in your code to direct the serial traffic to this port?



      In my experience with MEGA JVS, various JVS motherboards didn't like the amount of time it took me to reply to all 6 channels of analog values. I implemented a means of reading analog inputs faster than I was and got all channels working successfully on all JVS motherboards I have access to. I'm guessing if you're playing CT, that you've implemented analog. I'm not sure what your method for analog reading and replies is, but perhaps you can cut down on analog read times. CT would be using 3 analog inputs and Maze of Kings would be using 4 if you've implemented 2 player controls, correct? Does MOK work if you only read and report the values for the P1 controls and just zeroes for the rest?
    • New

      The idea of using the GPIO pins has been mentioned before - I think @invzim (phone isn’t showing user list so can’t work out if that’s the username I mean) has a board that fits to the top of a Pi zero tha uses the GPIO. It’s a good idea and would be cool if someone could try it and send back the results!

      That’s very interesting, thanks for the heads up. OpenJVS has one thread which replies analogue values strait from an array, so I’m not sure if I can make it any faster but I’ll have a try zeroing everything and see if that helps it.

      While we are here, you don’t happen to have made a list of which analogue channels/button channels are used for each game? Instead of everyone doing some JVS thing, maybe we could try and create a public document with all the info about which games require what?
    • New

      bobbydilley wrote:

      While we are here, you don’t happen to have made a list of which analogue channels/button channels are used for each game? Instead of everyone doing some JVS thing, maybe we could try and create a public document with all the info about which games require what?
      I'm mainly focused on driving games and they all use channels 1-3 and map up the same for wheel, accelerator, and brake.

      There is a list somewhere... @twistedsymphony, am I remembering a list you have?

      Edit: an exception to the driving game rule is that F-zero has an added channel for the yolk up/down movement. It's on channel 4, IIRC, and I can't remember if everything else maps up the same as the other drivers.
    • New

      You're probably thinking of this: NAOMI Net-Boot BIOS and I/O Board Compatibility Chart

      but there isn't anything that compares analog channels.

      while there is a lot of similar mapping between games, there's just as many differences.

      for instance Club Kart I think has inverted steering and uses twice as many bits for it's analog steering signal, making it mostly incompatible with other driving setups.

      Gun games usually map the X and Y the same but the trigger/screen out/alt fire functions aren't always mapped to the same buttons.

      for analog stick games you have Zombie Revenge which has an analog stick and 3 buttons, the you have a baseball game which has an analog stick mapped the same but an extra analog "bat" control on the 3rd channel but it only has 2 buttons which means you can't use a baseball panel for Zombie Revenge. then there's Monkey ball with no buttons , but the axis are inverted.
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