00957: pandoras: [possible] Graphic glitch.

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
00957	Graphics	Minor	Have not tried	Feb 7, 2008, 17:47	Oct 4, 2019, 19:29

Tester	Smitdogg	View Status	Public	Platform
Assigned To		Resolution	Open	OS
Status [?]	Confirmed			Driver	konami/pandoras.cpp
Version	0.58	Fixed in Version		Build
		Fixed in Git Commit		Github Pull Request #

Summary	00957: pandoras: [possible] Graphic glitch.
Description	On the first level, about half the pixels in the column near the bottom-left corner appear to be out of place (fig.1) and there are a couple of brown pixels on the ledge beside that column that should be on the horse statue's head on the other side of the screen. When you've played thru it to around level 6 or beyond, lose all your men, and start a new game, the pixels appear to be correct, the column appears correctly; most of the pixels on the entire screen have shifted (fig.2). However, there are usually some stuck pixels (see the second linked screenshot, near the left bottom corner there is a brown line that didn't disappear). This usually gets stuck during stage transitions, when the pixels shift off the screen, and correct themselves (disappear) a few levels later.
Steps To Reproduce
Additional Information
Github Commit

Flags	Possible
Regression Version	0.37b1
Affected Sets / Systems	pandoras

Attached Files	fig1.png (3,485 bytes) Feb 14, 2008, 17:45
	fig2.png (3,539 bytes) Feb 14, 2008, 17:45
	pandoras.diff (472 bytes) Feb 14, 2012, 02:53 Uploaded by M.A.S.H. [Show Content]
	Compare-0.36 - 0.37b1.png (31,401 bytes) Feb 14, 2012, 02:53 Uploaded by M.A.S.H.

No.02526 robiza Developer Sep 21, 2008, 19:22	all the sprites, at the boot, have a wrong offset
No.08195 M.A.S.H. Senior Tester Feb 14, 2012, 02:53 edited on: Feb 14, 2012, 02:55	With DOSBox i found the regression version (0.37b1) for this bug. The game became flipscreen support in this version and the draw_sprites routine was changed (see Compare-0.36 - 0.37b1.png). It was simple to fixed this (see pandoras.diff) and i have send it to submit@mamedev.org
No.08208 robiza Developer Feb 17, 2012, 05:01 edited on: Feb 17, 2012, 05:31	it's wrong in this way you fix the problem only the first time you play (if you finish the first level) the scroll value ($1a00) when you boot ($00) isn't the scroll value after you finish the first level ($ff) i think it's a original bug of the game interrupt routine: 8e0a lda $641d 8e0d sta $1a00 at the boot $641d is $00: 80a3 ldd #$0000 80a6 ldx #$6000 80a9 std ,x++ 80ab cmpx #$67ff 80ae bls $80a9 when you finish the first level the screen scroll; at the end of the scroll $641d is $ff 9400 ldd #$ff01 9403 sta $1a00 9406 sta $641d 9499 ldd #$ff00 949c sta $641d 949f sta $1a00
No.08282 Tafoid Administrator Feb 27, 2012, 17:20 edited on: Feb 27, 2012, 17:20	Based on developer comments, patch is rejected until proof of original behavior is noted.
No.17024 MetalGod Senior Tester Oct 4, 2019, 19:29 edited on: Oct 4, 2019, 19:37	The bug is not seen here. PCB from a collector: Yeah, this is attract-mode, but in MAME the bug is also seen during attract mode of level 1