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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
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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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