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jamma again

Discussion in 'General Tech Help & CD Burning Help' started by Xavier, Mar 14, 2002.

  1. Xavier

    Xavier Mid Boss

    ok i would like to know more about the wiring directly to buttons that somebody said somebody else did , ill use this untill I get the $50 for controllers .

    DO you just use a 5v to power he controller then soder to the open part of the board where it goes back to the cable?

    Also this one websight says that if you plug the r-g-b syn ground all into one and plug that into an rf modulator that migh work . What do hink?
     
  2. IceDigger

    IceDigger Founder Staff Member

    You don't use 5V at all. one side of all buttons and directions is connected to GND, you connect that to GND on the jamma harness. the other side is connected to the correct pin on the jamma harness for each button.

    that's gonna give you a nice short and possibly a dead videochip. DON'T.
     
  3. ExCyber

    ExCyber Staff Member

  4. Xavier

    Xavier Mid Boss

    hmm computer to hdtv

    close but no cigar

    thanks for tring though
     
  5. ExCyber

    ExCyber Staff Member

    It at least confirms my suspicion that RGB -> YUV/YIQ can be handled by some op amps plus a bit of logic to inject sync. I haven't really analyzed the circuit, but there's a couple issues that need to be looked at if you'd want to apply it:

    1) Ensure that the sync generation works for an interlaced signal.

    2) Ensure that the reference levels are correct (I don't think this is critical but the picture would suffer without it)

    Anyway, this is the closest thing I've found so far... what I'd really need now is a circuit to convert from YIQ/YUV to Y/C (S-Video), because I don't really understand quadrature modulation...
     
  6. Xavier

    Xavier Mid Boss

    ok I went out and got an old 9 pin sony rgb monitor for $30 at a used computer store hopefully this'll work , I also went to local arcade parts/sales store and got a used up 2 player 14 button controll panel for $25 . Now its got 3 switches on it . I know you put the proper ones on the NO part of the switch which part do you put the ground to ?(nc) Which ground of the jamma harness do you use for the ground ?(last 4)

    I bought a jamma harness with all the wires already on it , to some parts of the power supply there are 4 cables going to it , that should work the same though right ?

    because in all the diagrams they had one without wires and soldered the two pins together then soldered those two wires together .

    Also on my pc power supply I noiced on one of the main ones I get most of my power from that there are two ground instead off feeding all the ground to one like everybody else did I split them up between the 2 .

    But Ill probably have to take some off once you tell me which ones to use if I had to guess id say the last 2 to the last 4 depending on how many controllers you had
     
  7. IceDigger

    IceDigger Founder Staff Member

    it doesn't matter which pin of the button is hooked up to GND, and it doesn't matter which GND you use (as long as it's not video or audio GND).

    you can use one of the GND lines alone, that'll suffice. just make sure you solder the top and bottom pins for each power line together, i.e. the first 2x2 for GND, the next 2x2 for 5V, etc. also, you usually don't need to connect the last 4 GND pins, since 99% of the boards link the first 4 and last 4 anyways.
     
  8. Xavier

    Xavier Mid Boss

    ok I plugged it in and turned it on

    Got power :)

    Got sweet sound :)

    Got no picture :(

    its all scrambled

    Im using a 9-pin adapter sony multiscan using the specs from cps-2 build a jamma

    now it says ground to 1&2 unfort. the cable that came attached to my harness only has a few metal wires coming from it maybe if I cut of the head of the connector and splice all 3 of these cables together thatll work better . Im also off to see If i can find these specs of apple rgb monitors to jamma I fond before , maybe its an apple monitor .

    Its called a Sony Trinitron Multiscan HG Super Fine Pitch . Its calls the input in the back RGB INPUT and has three colrs red green and blue on the front , thats why I got it . It was manufactured in 1990 .

    Im off also to see if I find any info on it on the net , let me know if you can think of anything .

    Thanks
     
  9. Xavier

    Xavier Mid Boss

    Sony CPD-1304 Specifications

    Looks like this mointor wont work :(

    Bastards hope they give me an exchange or a different monitor .

    Screen Attributes

    14" Trinitron

    13.0 viewable image

    .25 mm dot pitch

    Input Signal

    Video Signal : Analog

    H Frequency : 28-50 Khz

    V Frequency : 50-87 Hz

    Sync Signal : Composite, Green

    Video Bandwidth

    50 Mhz

    Input Connector

    DB-9 to HD-15

    Maximum Resolution

    Maximum : Up to 1024x768

    Macintosh : 832x624, 75 Hz

    Flicker free :

    Power Use

    Power Supply : 100 watts

    Consumption :

    Compatibility

    Mac Adapter : Mac PnP; Mac Sync

    PC Adapter :

    User Controls

    Analog controls

    BR, CT, VE, VS, HZ, HS

    Plug and Play

    Dimensions and Weight

    Height : 13.7

    Width : 13.9

    Depth : 16.2

    Weight : 28.6

    Regulatory Compliance

    EMS EMI :

    Safety :

    X-Ray :

    Radiation :

    Power Saving
     
  10. IceDigger

    IceDigger Founder Staff Member

    eh, yeah, that won't work.. that's a VGA monitor.

    go for an amiga monitor, such as the 1084 series, or an atari 1435.
     
  11. Xavier

    Xavier Mid Boss

    ok i got the ad724 chip and ad725 chip in the mail today , (we were dicussing in an earlier thread )hopefully I can get one of these to work if you go to there main websight theyll overnight you a sample of these chips for free .(please dont ask them for this if you dont have a purpose for it or even know what it is) Im sure this costs them about $20+

    Anyways if anyone can help me decipher the schematics quicker id appreciate it .

    I think I have them figured out except

    1 hows many amps can this chip handle ?( because i see itll take +5 volts will I need to attach another fuse if II power from my pc power supply )

    2. There arnt any other extenal parts I need are there ?

    3. do you think these will synch low enough ?

    heres the links .

    http://www.analog.com/productSelection/pdf/2302_0.pdf

    http://www.analog.com/productSelection/pdf/AD724_b.pdf

     
  12. ExCyber

    ExCyber Staff Member

    1 hows many amps can this chip handle

    Depends on what you're talking about. The appropriate values should be in the "absolute maximum ratings" section of the datasheet.

    There arnt any other extenal parts I need are there

    Yes, there are. Most importantly, you need a clock source. IIRC, the AD72X series will take either 4x or 1x the frequency needed and can be connected directly to a crystal, but I'd need to check. You'll probably also need various bits to condition/terminate the signals, but nothing heavy AFAIK (unlike some encoders that require a delay line and other stuff).

    3. do you think these will synch low enough

    Yes. They're designed for NTSC/PAL, so there should be no problem with sync rates on standard res games. Meidum-res and High-res games are another story (though I think a standard VGA monitor will handle high-res).
     
  13. mal

    mal Member

    The Data Sheet for the AD725 has an example circuit, but it refers to displaying VGA on a TV rather than RGB.

    I'm sure it could be adapted for RGB easily enough.

    Presently I'm considering cannibalising a defunct Saturn for the Sony CXA1645M on the main board. :)
     
  14. Xavier

    Xavier Mid Boss

    >>>Depends on what you're talking about. The >>>appropriate values should be in the "absolute

    >>>maximum ratings" section of the datasheet.

    I didnt see it there thats why I asked
     
  15. ExCyber

    ExCyber Staff Member

    You're right; apparently this isn't something they evaluate. However, I doubt it's much of a problem unless you directly connect the outputs to ground, and maybe not even then (seems to me they would want to design it to be tolerant of a short in the TV or cable).
     
  16. Xavier

    Xavier Mid Boss

    ok well Ive got video I went out and bought this monitor for $35 :

    Magnavox CM1352 Specifications

    Screen Attributes

    14"

    13 viewable image

    .42 mm dot pitch

    Input Signal

    Video Signal : Digital

    H Frequency : 15.7 Khz

    V Frequency : 47-62 Hz

    Sync Signal : Separate

    Video Bandwidth

    Mhz

    Input Connector

    9 pin

    Maximum Resolution

    Maximum : 640x200

    Macintosh :

    Flicker free :

    Power Use

    Power Supply :

    Consumption :

    Compatibility

    Mac Adapter : None

    PC Adapter :

    User Controls

    Analog controls

    Plug and Play

    Dimensions and Weight

    Height : 15.5

    Width : 14.5

    Depth : 15.4

    Weight :

    Regulatory Compliance

    EMS EMI :

    Safety :

    X-Ray :

    Radiation :

    Power Saving

    I used the specs floating around on the net for rgb 9 pin , cept it didnt work

    So I took off the cync and put ground on pin 7 alone

    and that worked wonders !!!!!!!!!!

    Now I gotta hook up my controll panel :) :) :,)
     
  17. ExCyber

    ExCyber Staff Member

    I wonder what possessed them to spec it at 200 lines... you might want to check and make sure that the top/bottom aren't getting cut off (standard res games are 224 lines if I'm not mistaken), but I suspect that this spec is just wrong.
     
  18. Xavier

    Xavier Mid Boss

    http://www.ionpool.net/arcade/tech/monitor...nch.pdf

    loist of other monitors i think would work
     

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