Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
08422 Graphics Minor Always Sep 25, 2022, 20:51 Sep 27, 2022, 20:44
Tester ICEknight View Status Public Platform MAME (Official Binary)
Assigned To Resolution Open OS Windows 10/11 (64-bit)
Status [?] Acknowledged Driver
Version 0.247 Fixed in Version Build 64-bit
Fixed in Git Commit Github Pull Request #
Summary 08422: nes and clones, famicom and clones [opaopa]: Fantasy Zone II: HUD shows a line of garbage
Description The bottom line of the in-game HUD shows garbage pixels that scroll along the main screen. Recordings of real hardware show that the garbage should be limited to a few pixels on the right and change constantly, as can be seen in the following videos:

Interestingly, the area showing the garbage may differ slightly between NES/Famicom models (or when using flashcarts?).
Steps To Reproduce Just start a game or wait for the demo to start.
Additional Information This is also one of the NES games that show a noticeable colored border framing the screen, as reported here:
Github Commit
Flags Verified with Original
Regression Version
Affected Sets / Systems nes and clones, famicom and clones [opaopa]
Attached Files
png file icon mame.png (16,254 bytes) Sep 25, 2022, 20:51 Uploaded by ICEknight
MAME 0.247
png file icon famicom.png (721,135 bytes) Sep 25, 2022, 20:52 Uploaded by ICEknight
png file icon nes flashcart.png (740,898 bytes) Sep 25, 2022, 20:52 Uploaded by ICEknight
NES? with flashcart
There are no relationship linked to this issue.
User avatar
Senior Tester
Sep 26, 2022, 21:17
Another one of the many cartridge IRQ timers that don’t work well. I updated the Sunsoft-3 code previously, so it will take someone fixing the PPU. Still it’s good to know what the aberrations look like on real hardware.

Side note: the other Sunsoft-3 game (mitokom) doesn’t use the IRQ as far as I could tell.
User avatar
Sep 27, 2022, 20:44
edited on: Sep 29, 2022, 17:09
Can confirm that the NES + flashcart combo indeed shows the effect as in the second video:

The difference seen is likely caused by the flashcart's mapper emulation but, sadly, I don't have a real cartridge to confirm that it behaves as in the first video.