MAMEWorld Forums - EmuChat - Re: zoo keeper refresh rate change?

> Actually, the MCFG_SCREEN_RAW_PARAMS in qix.c are noted in a comment as being
> arbitrary junk that will get overwritten at runtime (qix hardware uses a MC6845
> CRTC).

Here's the line...

Code:

MCFG_SCREEN_RAW_PARAMS(QIX_CHARACTER_CLOCK*8, 256, 0, 256, 256, 0, 256)	/* temporary, CRTC will configure screen */

Are you saying that these numbers are made up?

Here's how this ends up in the listxml output...

Code:

{display tag="screen" type="raster" rotate="0" width="256" height="256" refresh="76.293945" pixclock="5000000" htotal="256" hbend="0" hbstart="256" vtotal="256" vbend="0" vbstart="256" /}

(substitute the normal less-than and greater-than in place of the curly brackets)

The main problem is the refresh rate... 76.293945 Hz
Which like I said above, I'm not sure that's even valid for a 15KHz arcade monitor.

How does the refresh rate get calculated from the MCFG_SCREEN_RAW_PARAMS ?

> For other drivers that use a programmable CRTC but all the games in the driver
> are known to program it the same way (e.g. twincobr.c or the various TMS340-based
> Midway boards) we generally set the parameters to match what the games actually use.

So you're saying that all games in this driver do not program it the same way, unlike the other drivers you mention.

GroovyMAME support forum on BYOAC

Edited by krick (07/07/12 08:17 AM)