03597: outrun, outrunra, outruno, outrundx, outrunb: Incorrect vsync speed on Outrun

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
03597	Original Reference	Minor	N/A	Dec 24, 2009, 02:07	Dec 24, 2009, 03:34

Tester	Machone	View Status	Public	Platform
Assigned To	Tafoid	Resolution	Fixed	OS
Status [?]	Resolved			Driver	sega/segaorun.cpp
Version	0.135u4	Fixed in Version	0.136	Build
		Fixed in Git Commit		Github Pull Request #

Summary	03597: outrun, outrunra, outruno, outrundx, outrunb: Incorrect vsync speed on Outrun
Description	Outrun is using the wrong crystal to determine the pixel clock speed. Thanks to Guru's notes in 0.135u4 we can see that vsync should be 60.0543 Hz, whereas MAME is currently at 47 Hz. Needs following line change: MDRV_SCREEN_RAW_PARAMS(MASTER_CLOCK/8, 400, 0, 320, 262, 0, 224) to: MDRV_SCREEN_RAW_PARAMS(MASTER_CLOCK_25MHz/4, 400, 0, 320, 262, 0, 224) to bring it up to 60.0543 Hz (same as Super Hang-on is using). Also, the following line: #define MASTER_CLOCK_25MHz (XTAL_25_1748MHz) /* super hang-on only */ needs to be changed to reflect the fact that Outrun also uses the 25 MHz clock, as noted in Guru's readme as well as http://arcade.ym2149.com/pcb/sega/outrun_video_pcb_partside.jpg (video board pic).
Steps To Reproduce
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	outrun, outrunra, outruno, outrundx, outrunb

Attached Files

No.05302 Tafoid Administrator Dec 24, 2009, 03:34	The clock readings are close, but not precise due to variations of the osc speeds, but you are correct - when I changed the main cpu, I didn't think to check the video. Thank you.