Reply To: OSSC + Pentium 233 MMX (VGA)

NewHome › Forums › OSSC, OSSC Pro and DExx-vd isl › OSSC – Discussion and support › OSSC + Pentium 233 MMX (VGA) › Reply To: OSSC + Pentium 233 MMX (VGA)

July 28, 2018 at 9:14 PM #22633
root42
Participant

    So I tried your timings, but they lead to no sync at all when in text mode. Since the DOS text mode is also 400 lines, I do not see an option to use those settings, apart from loading a preset when running a game, which I find inconvenient. I use these settings in VGA text mode (720×400@70 Hz) on my 286 PC (currently with Trident 9000, but also with ET4000):

    H. samplerate 874
    H. synclen 104
    H. backporch 51
    H. active 741
    V. synclen 2
    V. backporch 32
    V. active 405

    This is obviously the same settings that is used for 320×200 games under DOS.

    Windows runs in 640×480@60 Hz using these timings:

    H. samplerate 850
    H. synclen 59
    H. backporch 56
    H. active 720
    V. synclen 2
    V. backporch 30
    V. active 480

    This leads to a good picture, although 2 lines or so at the bottom are missing. But so far I am not bothered.