06868: dkong: Video rendering is not cycle accurate or accounting for all bus factors.

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
06868	Graphics	Minor	Always	Feb 6, 2018, 05:55	Apr 8, 2018, 17:09

Tester	-Misc Reporters-	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows 10 (64-bit)
Status [?]	Acknowledged			Driver	nintendo/dkong.cpp
Version	0.194	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	06868: dkong: Video rendering is not cycle accurate or accounting for all bus factors.
Description	Simply put, the video output for this game, which also effects many different machines' emulated output, alters the way the game is presented on screen at a frame by frame level. A specific and easily visible issue is that the latest version of MAME emulates this scan from right to left instead of from left to right like an actual arcade Donkey Kong does, so the timing information is opposite. Further details are available as tests were done from MAME recordings, Arcade PCB output sources. http://donkeykongforum.com/index.php?topic=2055.msg33395#msg33395
Steps To Reproduce
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	dkong

Attached Files

No.14933 smf Developer Apr 8, 2018, 17:09	0.196 swaps the orientation to match the default setting for original boards (it's possible to modify an original board to match the previous MAME behaviour http://www.brasington.org/arcade/tech/flip/dk.shtml) Bus contention is still not emulated, so the screen transitions are still wrong.