06608: nms8255, nms8250, expert20: MSX2/2+ Screen issue

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
06608	Graphics	Minor	Always	Jun 6, 2017, 14:59	Jun 16, 2017, 02:10

Tester	daneman	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows 10 (64-bit)
Status [?]	Confirmed			Driver	msx/msx.cpp
Version	0.185	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	06608: nms8255, nms8250, expert20: MSX2/2+ Screen issue
Description	Hello, MSX 2/2+ screen is not covering entire display as it can. The upper and lower borders of the screen are wrong and consuming too much display area. I'm comparing with other emulators which can fully emulate MSX2/MSX2+ screen accordingly. Sretching options on Mame only stretchs left and right borders. Tried with MSX 2 nms8250, nms8255 and expert20. If you compare MSX 1 emulation (any system) on MAME you can see a proper use of display and borders. Attached zip file with MSX1 print running on mame accordingly and MSX2 print with excessive border usage, for comparison.
Steps To Reproduce	Run MSX2/MSX2+ emulation
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	nms8255, nms8250, expert20

Attached Files	msx_screens.zip (3,794 bytes) Jun 6, 2017, 14:59 Uploaded by daneman msx 1 and 2 screens

No.13898 Haze Senior Tester Jun 8, 2017, 12:41	since MESS is no more, is there any point in having the 'mess_specific' flag here? I notice MASH keeps bumping posts to set it, when really these days it's all just MAME and doesn't need setting.
No.13900 Tafoid Administrator Jun 8, 2017, 14:33	I'm keeping it until it is no longer a valid SUBTARGET=mess. The system is set up for it and there are still users of it separately, as well. Yes, eventually all bugs will need to be changed to MAME but you have to remember that there are Devs who are not interested in arcade hardware and other Dev not at all interested in what MESS brought to the table. The bumping is an unfortunate side effect of making any change to a bug, but as a moderator/admin this can be done without bumping which I do to a LOT of bugs. MESS stays for now.
No.13901 Tafoid Administrator Jun 8, 2017, 14:44	I'm confirming this based on a video here: Where Vampire Hunter appears to hit near top/bottom of the screen on real hardware The emulation, using example from softlist, has sizable empty areas on top and bottom: mame nms8250 vampkill
No.13912 daneman Tester Jun 16, 2017, 02:10 edited on: Jun 16, 2017, 09:26	If you see 05623 seems like this bug was saw and fixed on MESS 0.166.