Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
06892 Graphics Minor Always Feb 27, 2018, 09:10 Mar 28, 2018, 02:09
Tester ICEknight View Status Public Platform MAME (Official Binary)
Assigned To Resolution Open OS Windows 10 (64-bit)
Status [?] Acknowledged Driver
Version 0.194 Fixed in Version Build 64-bit
Summary MESS-specific 06892: megadriv.cpp, sms.cpp, segapico.cpp and related: Display is cropped
Description MAME isn't rendering the full output of the Mega Drive and crops the borders that can be seen on real hardware (and other emulators such as Exodus or BlastEm).

Attached is a comparison of the border-less MAME output and BlastEm's more accurate display with the full borders changing colors mid-screen.

Said borders are also present in the Master System, Game Gear (when connected to a TV through official means:, Pico (seen here:
) and other related hardware such as the SEGA Radica systems (seen here:
Steps To Reproduce Most games (such as Sonic The Hedgehog) will show a colored border right at the title screen.
Additional Information MAME already renders the full display area with borders for computer emulation (fmtowns.cpp, amstrad.cpp), but other consoles and arcade systems may be sharing this problem as well.
Flags Verified with Original
Regression Version
Affected Sets / Systems megadriv.cpp, sms.cpp, segapico.cpp and related
Attached Files
png file icon sonic2 mame blastem.png (61,445 bytes) Feb 27, 2018, 09:10 Uploaded by ICEknight
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Senior Tester
Feb 28, 2018, 19:00
I guess it should be an option at least, the problem is most people consider the borders being present to be a bug, so we probably need to cater for both.
User avatar
Mar 2, 2018, 12:45
Perhaps an adjustable "Crop overscan" option would make those people happy and also "fix" #06878 (and other similar Neo Geo "issues") in the process.
User avatar
Mar 11, 2018, 20:26
Dullaron has just pointed out at MAMEWorld ( that VS Excitebike is missing a colored border at the bottom. so this may also extend to other NES-based hardware as well.

(close up at 2:10:35)
User avatar
Mar 28, 2018, 02:09
Mega Drive should at least have the border as a display option (e.g. via the artwork system) similar to the 304-wide Neo-Geo games, if it's there on the real thing e.g. when messing with the horizontal hold on a CRT TV it should at least be possible to show it in MAME. Same goes for NTSC NES games where the top 16 pixels aren't normally seen.

The (unrelated) Excitebike border problem (the border around the Nintendo logo on the wall, not the screen itself) is most likely just a video timing bug, Super Mario 3 had similar problems with the HUD on older emulators which used exactly 60Hz instead of 59.94 or thereabouts.