08618: megatech: Display for Master System games shrinks if there's a Mega Drive game in another slot

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08618	Interface	Minor	Always	Apr 29, 2023, 18:53	May 2, 2023, 11:48

Tester	ICEknight	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows 10/11 (64-bit)
Status [?]	Acknowledged			Driver	sega/megatech.cpp
Version	0.254	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08618: megatech: Display for Master System games shrinks if there's a Mega Drive game in another slot
Description	If there's a slot with a Mega Drive game in it, the Master System games will be displayed in a smaller and uncentered window.
Steps To Reproduce	-Load megatech and choose mt_aftrb or another Master System game from its software list. The game screen will look fine. -Go to File Manager and load a Mega Drive game on any empty cart slot (for example, slot2 mt_beast). Now the game screen for the Master System game will shrink.
Additional Information	This is not a regression, it already happened in previous main builds.
Github Commit

Flags
Regression Version
Affected Sets / Systems	megatech

Attached Files	mt_aftrb1.png (96,000 bytes) Apr 29, 2023, 18:53 Uploaded by ICEknight
	mt_aftrb2.png (79,892 bytes) Apr 29, 2023, 18:53 Uploaded by ICEknight
	mt_aftrb3.png (79,862 bytes) Apr 29, 2023, 18:53 Uploaded by ICEknight
	mt_aftrb4.png (96,694 bytes) Apr 29, 2023, 18:53 Uploaded by ICEknight
	outrun_megatech.png (20,605 bytes) Apr 30, 2023, 12:43 Uploaded by ICEknight
	outrun_megatecbug.png (21,232 bytes) Apr 30, 2023, 12:43 Uploaded by ICEknight

No.21375 ICEknight Tester Apr 30, 2023, 19:42 edited on: May 1, 2023, 01:24	Also... This bug made it apparent that MAME actually does render the full border but then crops it, so this might be a good opportunity to kill two birds with one stone and leave the default view uncropped, since it happens to be another one of those systems with visible colored borders around the screen (and was up to the user to hide them if the monitor allowed them to):
No.21386 Robbbert Moderator May 2, 2023, 07:38	I tested with After Burner and with Altered Beasts. Only After Burner was affected - Altered Beast was properly centered. Then I tried with Altered Beasts and Crack Down - both displayed ok. Then I added After Burner as cart3 - it showed the problem again. It seems the issue may be limited to After Burner. You might want to do some more testing, and correct the Summary.
No.21390 ICEknight Tester May 2, 2023, 11:46	Mega Drive games (such as Altered Beast) look fine, this report is about the Master System games.