06701: pce [shingen, shingen1]: Extended/Unexpected periods of Black Screen

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
06701	Gameplay	Minor	Always	Oct 6, 2017, 00:30	Oct 11, 2017, 13:09

Tester	Tafoid	View Status	Public	Platform	MAME (Official Binary)
Assigned To	Kale	Resolution	Fixed	OS	Windows Vista/7/8 (64-bit)
Status [?]	Resolved			Driver	nec/pce.cpp
Version	0.190	Fixed in Version	0.191	Build
		Fixed in Git Commit		Github Pull Request #

Summary	06701: pce [shingen, shingen1]: Extended/Unexpected periods of Black Screen
Description	The game, Takeda Shingen, no does not start properly. It instead has a long periods of black screen waiting before the title screen starts. Same type of extended black screen when you hit RUN button to start as well when introduction symbols scroll right to left on screen. There is no delay for earlier versions and I presume is that way on original hardware.
Steps To Reproduce
Additional Information
Github Commit

Flags
Regression Version	0.148
Affected Sets / Systems	pce [shingen, shingen1]

Attached Files

No.14217 B2K24 Senior Tester Oct 6, 2017, 00:44	I noticed on my end If you wait about 25 - 30 seconds of black screen (can also fast foward), you're then able to press Run and start a game after seeing title screen.
No.14224 Tafoid Administrator Oct 6, 2017, 21:53	Updated description to better suit. I did not run the game for over 20 seconds to see if there was some odd delay which appears there is now and can confirm the change in behavior from previous versions.
No.14250 Kale Developer Oct 11, 2017, 04:09	Culprit is VRAM-VRAM DMAs, it sets up multiple transfers with 1 byte length at POST. Currently huc6270 does one DMA for each vblank (which is wrong, but I don't know the exact timing?).