06496: All set in vamphalf.cpp (except aoh): Visible area too small

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
06496	Graphics	Minor	Always	Feb 7, 2017, 10:31	Feb 9, 2017, 02:38

Tester	haynor666	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	No change required	OS	Windows Vista/7/8 (64-bit)
Status [?]	Closed			Driver	misc/vamphalf.cpp
Version	0.182	Fixed in Version	0.183	Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	06496: All set in vamphalf.cpp (except aoh): Visible area too small
Description	During changes in driver and/or chips visible area gets shrinked from 320x240 to 320x236. This way graphics are not shown correctly.
Steps To Reproduce
Additional Information
Github Commit

Flags
Regression Version	0.146u2
Affected Sets / Systems	All set in vamphalf.cpp (except aoh)

Attached Files	dtfamily-combined.png (137,718 bytes) Feb 7, 2017, 10:31 Uploaded by haynor666
Attached Files	jmpbreak-combined.png (137,184 bytes) Feb 7, 2017, 10:32 Uploaded by haynor666

No.13606 Haze Senior Tester Feb 7, 2017, 23:13 edited on: Feb 7, 2017, 23:34	it's correct, the hardware cuts off at that point, it was tested extensively, it simply doesn't output anything valid beyond that point some games are also coded around that assumption and the scrolling glitches in the bottom 4 lines if you draw it. it's bad design, but the visible area being used is actually correct. why I can't tell you, it's a weird resolution and I would have expected the opposite with the scroll glitches happening on the PCB, but what I found, after asking 3 different people to play with the stretch controls etc. on their screen is that that those lines never appear, something on the PCBs kills the video output at that point, at the very best we got what seemed like a repeat of the line above 4x but with broken x-offsets like the sync signals were completely wrong at that point.
No.13608 haynor666 Tester Feb 8, 2017, 21:44	Strange but if that's how it works then ok :)
No.13611 Robbbert Senior Tester Feb 9, 2017, 02:38	Since we're all agreed, let's close this.