Adding an external monitor to a Rev c CRT iMac?

Discussion in 'Graphics' started by Jamie Kahn Genet, Jun 4, 2008.

  1. Talk in other threads reminds me - my previous gaming iMac is a Lime Rev
    c 266MHz G3 iMac upgraded with 512MB RAM, a 140MB HD and a 500MHz G3 +
    Firewire Sonnet HARMONi upgrade card. Sadly the monitor is dying - it's
    getting slowly darker and darker as the months go by. It still kicks the
    arse of my fallback classic gaming Mac - a Rev a Bondi iMac upgraded
    with a Rev d's daughterboard to give it a 333MHz G3.
    What I'd like to do is save the Lime iMac by hooking up an external
    monitor - thoughts? Shouldn't be too hard, right? I'll just need to cut
    a hole in the case for the video cable, yeah? What adaptor would I

    Jamie Kahn Genet
    Jamie Kahn Genet, Jun 4, 2008
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  2. If I remember well, when I opened mine (333 MHz) to change the HD I saw
    a simple VGA connector. So a normal video VGA cable should do, no

    Xavier Llobet, Jun 4, 2008
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  3. Ah, so I'm shit out of luck? Nothing can be done? Oh well... I didn't
    think I remembered seeing a standard VGA connector last time I opened
    her up. Sad. I spent WAY too much money fixing and upgrading this iMac.
    Plus I'd be lying if I said I wasn't fond of the first Mac I ever bought
    with my own money.

    Jamie Kahn Genet
    Jamie Kahn Genet, Jun 4, 2008
  4. The tray-loading iMacs had their CRTs connected internally by Apple's
    traditional DB-15 display connector. A cheap adapter will let you plug a
    VGA monitor into it.
    Gregory Weston, Jun 4, 2008
  5. So... hope again! :-D Ok, I guess I need to pop the case and check for

    Jamie Kahn Genet
    Jamie Kahn Genet, Jun 4, 2008
  6. Certainly looks and sounds like it. Ok, I'm going to give this a try!
    :) I'll report back.

    Jamie Kahn Genet
    Jamie Kahn Genet, Jun 5, 2008
  7. Haha! I found an old Apple Multiple Scan 15av out back and it works
    GREAT! :) Now I just need to find a decent LCD screen that will work
    with the iMac's Rage Pro. What resolutions can the Rage Pro support?
    ATI's site is useless.

    Jamie Kahn Genet
    Jamie Kahn Genet, Jun 5, 2008
  8. Nah, they only tell me what resolutions the iMac can support with it's
    built in monitor. In fact the Rage Pro supports others as I can see
    after hooking up the external display.

    Strange that a list of resolutions supported by the Rage Pro should be
    so hard to find. Cheers anyway :)

    Jamie Kahn Genet
    Jamie Kahn Genet, Jun 5, 2008
  9. Jamie Kahn Genet

    David Empson Guest

    MacTracker doesn't know either.

    1024x768 at 75 Hz will work fine.

    A little back of the envelope calculation suggests that it can't go much
    larger than that with only 6 MB of VRAM. It would need 3 MB of VRAM to
    do millions of colours at 1024x768. 4.8 MB gets you to 1280x960, but it
    wouldn't be able to manage 1680x1050 (typical 20" widescreen) without
    dropping to thousands of colours.

    The Rage Pro might reach its limit at a lower resolution, if it can't
    handle the bandwidth. It can do 1024x768 at 75 Hz (58.98 Mpix/s), but
    might not be able to keep up with 1280x960 at 60 Hz (73.73 Mpix/s).

    There is also the question of whether it supports the DDC mechanism for
    identifying the video modes supported by a connected monitor, or whether
    it is hardwired to the capabilities of the internal display. What
    options did it offer with the Multiscan 15AV?
    David Empson, Jun 5, 2008
  10. Yeah, I reckon I'll be happy with 1024x768 in millions on an LCD. Thanks
    for that :)
    10 'recommended' choices plus another 10 not recommended. Most worked
    despite a warning, a few didn't at all.

    Jamie Kahn Genet
    Jamie Kahn Genet, Jun 5, 2008
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