Viewing Issue Advanced Details
|ID||Category [?]||Severity [?]||Reproducibility||Date Submitted||Last Update|
|07196||Timing||Minor||Always||Jan 4, 2019, 00:24||Jan 5, 2019, 18:41|
|Tester||bobRetro||View Status||Public||Platform||MAME (Official Binary)|
|Assigned To||Resolution||Open||OS||Windows 10 (32-bit)|
|Version||0.205||Fixed in Version||Build||32-bit|
|Summary||07196: nibbler: 2-player Slow Down|
|Description||When playing in 2-player mode, the game slows down periodically. This only happens in 2-player mode. In 1-player mode the speed is constant. It happens for both player 1 and player 2.|
|Steps To Reproduce||
Insert 2 credits and choose a 2-player game. Immediately go to the right side of the screen then to the top of the screen to the top-right corner and continue to move the snake counter-clockwise around the small square in the top-right corner. You will notice that as the snake comes out of the corner, its speed is diminished. This is not the only place this occurs, but is just mentioned for comparison purposes.
Compare to inserting 1 credit and choosing a 1-player game. Perform the same actions described above and you will notice there is no slowdown.
I've been able to reproduce this on both 32-bit and 64-bit builds, on multiple machines and versions as far back as 0.152. I'm not certain, but I think I had a version at one point where this didn't occur, but can't seem to find it.
Sometimes the slowdown is more pronounced than others. The entire game is slowing down and not just the speed of the snake as can be observed by watching the countdown timer when the slowdown is happening (easier to notice when you haven't eaten a dot for a while and the timer is counting down rapidly).
|Affected Sets / Systems||nibbler|
|There are no relationship linked to this issue.|
Jan 4, 2019, 01:13
edited on: Jan 5, 2019, 18:40
|The issue could be the maincpu speed which was adjusted to match animations and audio correctly using a common divisor to the maincpu xtal crystal (for mame 0.152). I won't consider it a full bug until someone can confirm with an actual PCB either the speed of the maincpu to confirm MAME's setting, or documented proof that it does or does not happen in a real PCB. I've labeled it as possible.|
Jan 4, 2019, 04:04
|I should have mentioned that I have played Nibbler on an original PCB (at the Galloping Ghost Arcade outside of Chicago) and am certain it does not occur. I played in both single and two-player mode and there was no difference in gameplay.|
Jan 5, 2019, 18:41
|Hopefully we can get some proper speed measurements from someone who can read them and put this one to bed sooner or later.|