Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
01666 Side-by-side Minor Have not tried Apr 3, 2008, 18:34 Nov 13, 2017, 01:28
Tester Gary Walton View Status Public Platform
Assigned To Resolution Open OS
Status [?] Confirmed Driver galaxian.cpp
Version 0.37b8 Fixed in Version Build
Summary 01666: mooncrst: Side-by-side test.
Description Setting both mame and PCB off together, everything is fine up to and including the sequence following the docking( i.e. docking and then the bug-type aliens ). During the *next* sequence, the PCB always dies first, leaving five (or six - it's hard to tell) aliens left. Mame dies a couple of seconds later leaving three aliens. This results in the next sequence being totally different as the PCB has ships II and III whilst mame has ships I and III. The demo sequence is not random and is the same each time it plays.
Steps To Reproduce
Additional Information This report is derived from 01023 in 0.124u1.

Flags Verified with Original
Regression Version
Affected Sets / Systems mooncrst
Attached Files
related to 01023Resolvedaaron mooncrst: Side-by-side test. 
User avatar
Senior Tester
Nov 12, 2017, 22:07
edited on: Nov 12, 2017, 22:10
there's some additional evidence (including videos) for this one in the Mameworld post

strange thing to have broken since 0.37b8 (3 October 2000), but it really looks like that's the last time Moon Cresta actually worked properly.
User avatar
Nov 13, 2017, 01:27
Nope, this isn't a regression. MAME Moon Cresta attract mode when compared to PCB has never worked properly.
0.37b8 is same as it is now. 0.36 is same as it is now too.
JonBoyRetro at MAMEWorld said it's fine on Mame4All PSP v4.9r2, which is based on 0.34. But 0.34 is still not right. While it does show 2 'docking sessions', the demo play not identical to the PCB.

If you change vsync to exactly 60hz in current MAME, attract mode will be same as in MAME 0.34.
It's possibly video(interrupt) timing related. Or something more obscure, like number of CPU cycles from power-on until 1st IRQ.