Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
07802 Gameplay Minor Always Nov 28, 2020, 07:22 Nov 30, 2020, 02:13
Tester Alex7 View Status Public Platform MAME (Official Binary)
Assigned To Resolution Open OS Windows 10 (64-bit)
Status [?] Confirmed Driver toaplan1.cpp
Version 0.226 Fixed in Version Build 64-bit
Fixed in Git Commit Github Pull Request #
Summary 07802: zerowing, zerowingw: [possible] Can't Shoot Stage 5 Boss Up and Down Sides
Description You can't shoot stage 5 up and down sides meaning you can't destroy certain parts of the boss because your bullets doesn't do any damage to said parts
but you can still hit it on the center it will take a lot more hits that way....
Steps To Reproduce Get to Stage 5 Boss
Additional Information

This is a video showing how it should be
Github Commit
Flags Possible
Regression Version 123u1 (feb 13 2008
Affected Sets / Systems zerowing,zerowingw
Attached Files
png file icon 0000.png (35,694 bytes) Nov 28, 2020, 07:22 Uploaded by Alex7
Stage 5 Boss
There are no relationship linked to this issue.
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Senior Tester
Nov 28, 2020, 20:27
edited on: Nov 29, 2020, 08:24
Bug in MAME (video recorded 6 months ago)

How it should work:
This video belongs to the 1 player version of the game anyway, where the bug is not present.
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Senior Tester
Nov 28, 2020, 20:28
edited on: Nov 29, 2020, 08:25
User avatar
Nov 29, 2020, 04:17
Yeah i finished testing and i found the game is glitched since it was added in (mame 123u1) a mame version between 123 and 124
also the sets affected are the 2players sets only
(1p version is working like it should)

Sets Affected
 (zerowing) Zero Wing 2Player Version
 (zerowingw) Zero Wing 2Player (Williams Version)
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Senior Tester
Nov 29, 2020, 08:26
edited on: Nov 29, 2020, 09:49
I'm adding again the "possible" flag. The bug is only present in 2 players version. It could be a design decision to make that boss more challenging considering 2 players were allowed. But I've checked it also ocurrs on easy mode.

I've found out that all the videos on youtube without the bug belongs to the 1 player version of the game. This can be checked just by watching the positions of the number of lives of the player (right side of the screen). In the 2 players versions of the game the number of lives for p1 are indicated on the left side.

I bet this is a BTANB. Unluckily there's no pcb video of this game to prove I'm right.
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Senior Tester
Nov 29, 2020, 09:48
I've added this one to the list I made:
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Nov 29, 2020, 11:18
maybe you are right i've noticed the 1p version is more harder for example when you die all of your powerups are gone and you start again without nothing
this does not happen on 2p version but yeah pcb video is the best proof
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Senior Tester
Nov 30, 2020, 02:13
my bet here is that it's a game bug, not a MAME bug, this would be under CPU control