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R. Belmont
Cuckoo for IGAvania
Reged: 09/21/03
Posts: 9716
Loc: ECV-197 The Orville
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Re: How to change refresh rate in MAME drivers?
01/27/11 12:56 AM
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> > > MCFG_SCREEN_REFRESH_RATE( (XTAL_14MHz / 2) / (446 * 286) )
> >
> > That's showing you how it's calculated: 7 MHz pixel clock divided by 446 horizontal
> > pixels (including hblank) times 286 vertical scanlines (including vblank).
>
> It looks like it's integer arithmetic though, so it's only getting 54.0 instead of
> the proper 54.879.

Good call. If you make it use FP math it does match the measured 54.87.






Entire thread
Subject Posted by Posted on
* How to change refresh rate in MAME drivers? caius 01/26/11 01:23 AM
. * Re: How to change refresh rate in MAME drivers? 9ofzeven  01/27/11 11:44 AM
. * Re: How to change refresh rate in MAME drivers? caius  01/27/11 12:21 PM
. * Re: How to change refresh rate in MAME drivers? 9ofzeven  01/28/11 11:33 AM
. * Re: How to change refresh rate in MAME drivers? R. Belmont  01/26/11 06:17 PM
. * Re: How to change refresh rate in MAME drivers? caius  01/26/11 09:40 PM
. * Re: How to change refresh rate in MAME drivers? couriersud  01/26/11 09:45 PM
. * Re: How to change refresh rate in MAME drivers? caius  01/26/11 10:49 PM
. * Re: How to change refresh rate in MAME drivers? R. Belmont  01/26/11 10:52 PM
. * Re: How to change refresh rate in MAME drivers? drewcifer  01/27/11 12:35 AM
. * Re: How to change refresh rate in MAME drivers? caius  01/27/11 01:10 AM
. * Re: How to change refresh rate in MAME drivers? AWJ  01/27/11 01:15 AM
. * Re: How to change refresh rate in MAME drivers? caius  01/27/11 01:53 AM
. * Yeah, operative words: in a frame (nt) mogli  01/27/11 07:49 AM
. * Re: How to change refresh rate in MAME drivers? AWJ  01/27/11 02:30 AM
. * Re: How to change refresh rate in MAME drivers? caius  01/27/11 01:09 PM
. * Re: How to change refresh rate in MAME drivers? R. Belmont  01/27/11 12:56 AM
. * Re: How to change refresh rate in MAME drivers? AWJ  01/27/11 01:01 AM
. * Re: How to change refresh rate in MAME drivers? mogli  01/27/11 12:18 AM
. * Re: How to change refresh rate in MAME drivers? R. Belmont  01/27/11 12:59 AM
. * Re: How to change refresh rate in MAME drivers? mogli  01/27/11 06:13 AM
. * Re: How to change refresh rate in MAME drivers? R. Belmont  01/31/11 11:27 PM
. * Re: How to change refresh rate in MAME drivers? mogli  02/04/11 07:58 AM
. * Re: How to change refresh rate in MAME drivers? Vas Crabb  02/02/11 11:39 AM

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