00448: pisces: Sometimes there is a square block on the bottom right in attract mode, or gameplay.

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
00448	Graphics	Minor	Have not tried	Jan 29, 2008, 16:24	Nov 4, 2018, 10:45

Tester	Thenasty	View Status	Public	Platform
Assigned To		Resolution	Open	OS
Status [?]	Confirmed			Driver	galaxian/galaxian.cpp
Version	0.95u6	Fixed in Version		Build
		Fixed in Git Commit		Github Pull Request #

Summary	00448: pisces: Sometimes there is a square block on the bottom right in attract mode, or gameplay.
Description	Sometimes there is a square block on the bottom right in attract mode, or gameplay. *Update by Machone:* This seems to be related to the main CPU speed. If you underclock or overclock the z80 processor by just 1%, the problem goes away. The current speed of the z80 in MAME is 3.072mhz, so perhaps this is wrong and should be set at 3mhz?
Steps To Reproduce
Additional Information	Formerly driver galaxian.c (changed in 0.124u1)
Github Commit

Flags
Regression Version
Affected Sets / Systems	pisces

Attached Files	v0.100.png (1,921 bytes) Apr 4, 2008, 09:14
	v0.124u1.png (4,834 bytes) Apr 4, 2008, 09:24
	savestate_0124u1.rar (8,691 bytes) Apr 4, 2008, 09:33

No.00543 haynor666 Tester Apr 4, 2008, 07:54	I've seen this squares on many games, just look on the recent bug in cp1 cps2 driver. Also this happens to me in vs. games as well, but not always.
No.00548 Fujix Administrator Apr 4, 2008, 09:24 edited on: Apr 4, 2008, 09:25	I think this is different from the case of cps1 and cps2 drivers. I uploaded screenshots taken with 0.100 and 0.124u1.
No.00549 haynor666 Tester Apr 4, 2008, 09:45	mAybe this is more general bug.
No.15733 MetalGod Senior Tester Nov 4, 2018, 10:45 edited on: Nov 4, 2018, 23:05	Tested on mame 0.203 *Edit. More testing done. The bug can ocurred in two situations. Attract mode and gameplay. - The bug appeared always in attract mode before mame 0.114 - The bug still appears randomly in gameplay Fixed in attract mode between mame 0.113 and mame 0.114 In mame 0.203 the bug still ocurrs during gameplay, but it is quite rare to ocurr (5%)