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New screen

stevenmess2004stevenmess2004 Posts: 1,102
edited 2008-04-28 13:33 in Propeller 1
Well I just got a 7in monitor from Big W for $49 Aus

Seems to work alright. NTSC comes out as B&W but the colour works on PAL.

Now I will be able to test stuff without having to wait for the TV hop.gif

And for the required pic. Sorry its not great but its inside with bad light from the camera in my laptop.
Photo 66.jpg
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Comments

  • stevenmess2004stevenmess2004 Posts: 1,102
    edited 2008-04-02 07:31
    And yes the picture is mirrored when the laptop takes the picture because that's the way it looks when looking in a mirror...
  • DroneDrone Posts: 433
    edited 2008-04-03 01:08
    I got a DVD player with what looks to be an identical screen, speakers and all, for about $50 USD. It does PAL only. I wish it did NTSC. PAL has been an issue with respect to colors but I think someone sorted it out recently. Good luck - David.
  • stevenmess2004stevenmess2004 Posts: 1,102
    edited 2008-04-03 01:16
    Yeah, I just downloaded the patched tv.spin that Baggers and Coley did and it works a lot better than the standard one. The colours are a bit different though. It does do B&W NTSC, just not colour NTSC.
  • BaggersBaggers Posts: 3,019
    edited 2008-04-03 09:41
    hey stevenmess is my NTSC colour not working? does it work on other tv's / lcd's you have? it works all the ones we tested it on.

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  • stevenmess2004stevenmess2004 Posts: 1,102
    edited 2008-04-03 10:13
    No, the NTSC in the patched TV.spin doesn't work but it does come out in a nice grey scale (Maniac Miner does the same thing). In the spec for the display it says it only does PAL so any NTSC support was a bonus. The patced PAL is a lot steadier though but there is still a small amount of shimmering on a diagonal and it gets worse on the top right of the screen. And the normal NTSC in the normal tv.spin works fine on the other tv in the house.
  • BaggersBaggers Posts: 3,019
    edited 2008-04-03 10:18
    ok, strange, as it's not really changed for ntsc from the parallax driver.

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    http://www.propgfx.co.uk/forum/·home of the PropGFX Lite

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  • stevenmess2004stevenmess2004 Posts: 1,102
    edited 2008-04-03 10:29
    Whats strange? The fact the colour NTSC doesn't work at all even when the display is only specified for PAL or the fact that its not spec'd for NTSC?
  • BaggersBaggers Posts: 3,019
    edited 2008-04-03 14:04
    oh, is the display PAL only? that'll explain why it doesn't do NTSC in colour, cos it's not doing the phase alternating [noparse]:)[/noparse]
    sorry, thought it was PAL & NTSC display [noparse]:D[/noparse]

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    http://www.propgfx.co.uk/forum/·home of the PropGFX Lite

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  • stevenmess2004stevenmess2004 Posts: 1,102
    edited 2008-04-03 19:51
    Yeah, the display is PAL only so like I said, any NTSC is a bonus.
  • BaggersBaggers Posts: 3,019
    edited 2008-04-04 12:58
    excellent then [noparse]:)[/noparse]

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  • Peter JakackiPeter Jakacki Posts: 10,193
    edited 2008-04-28 03:02
    I picked up one of those displays too the other day although they are not on special any more cry.gif

    I did a quick hack of the graphics demo to turn the prop into a TV clock, looks great.
    From now on I will make sure that I have TV output option from my boards and not just VGA. Another connector perhaps lthough it is possible I guess to borrow some of those vga lines and feed a TV option out. It probably won't hurt to feed composite video out on pin 9 of the VGA connector which is normally a key pin.

    *Peter*
    PROPCLOCK.jpg
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  • stevenmess2004stevenmess2004 Posts: 1,102
    edited 2008-04-28 05:18
    Are you in Australia Peter or somewhere else?

    I wonder if it is possible to figure out a system where either VGA or TV can be used from the same pin group. Maybe just a couple of groups of the resistors and some dip switches?
  • Peter JakackiPeter Jakacki Posts: 10,193
    edited 2008-04-28 05:58
    Steve,

    I'm in Brisbane. There should be no problem in paralleling resistors for the TV with the VGA signals directly from the Propeller I/O which is what I am changing on my designs.
    If I want TV output then I simply use pin 9 of the VGA connector and set the Propeller to generate TV rather than VGA signals of course. I might even get rid of the bulky VGA connectors and just go RJ-45 with an external adapter lead, it simplifies case metalwork.

    *Peter*
    VGA+TV.png
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  • stevenmess2004stevenmess2004 Posts: 1,102
    edited 2008-04-28 11:11
    Won't the extra resistors muck up the VGA signal? Also, won't using P19 muck up the 270 ohm resistor?
  • Peter JakackiPeter Jakacki Posts: 10,193
    edited 2008-04-28 13:33
    All the prop pins are low-impedance outputs, it makes no difference as long as they stay outputs and that they handle the load. If this was not the case then there might be problems but that is far from the case. None of the I/O pins can affect any of the other I/O pins as they are not directly coupled and are outputs, not inputs.

    Take the case of VGA generation, the only difference is that the P16,P17,P18 are also connected to other resistors, but there is nothing in that setup that can affect the VGA signal. The resistors would have to be really low values and the I/O pins would have to be really weak outputs for there to be a problem.

    Conversely, in the case of TV generation there is nothing that the VGA resistors can do to affect the TV signal. So just imagine that the I/O pins are low resistance switches to VDD or GND which effectively they are and you will see that this is so.

    Of course in this circuit I would add the extra resistor to P19 for the sound anyway, whether it's used or not.

    *Peter*
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