03041: starshp1, starshpp: Speed and graphics information from the real machine.

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
03041	Graphics	Minor	Always	Mar 17, 2009, 15:49	Jun 26, 2017, 02:28

Tester	Smitdogg	View Status	Public	Platform
Assigned To	palazzol	Resolution	Fixed	OS
Status [?]	Resolved			Driver	atari/starshp1.cpp
Version	0.130	Fixed in Version	0.187	Build
		Fixed in Git Commit		Github Pull Request #

Summary	03041: starshp1, starshpp: Speed and graphics information from the real machine.
Description	If you check this video (skip to about 1:03) it shows Starship 1. As noted in the source, it looks like in MAME the speed is too slow (compare the speed of the shots). But also, when the photon torpedoes are launched, there is a shaking effect on the enemy ships that it looks like MAME is missing?
Steps To Reproduce
Additional Information
Github Commit

Flags	Verified with Original, Noted in Source
Regression Version
Affected Sets / Systems	starshp1, starshpp

Attached Files

No.03993 Gyrovision Tester Mar 17, 2009, 18:29 edited on: Mar 17, 2009, 18:29	During the Photon Torpedo explosion effect on the enemy ships, you can see a VERY FAST left-to-right left-to-right flipping effect on the enemy ships as they are exploding. Good observation Smitdogg! This effect is missing in MAME.
No.03998 Fortuna Tester Mar 18, 2009, 22:48	yeah, great eyes, this effect not see never in the game
No.04000 Phil Bennett Developer Mar 19, 2009, 12:06	Looks like there's a hack to patch out legitimate game behaviour :) WRITE8_HANDLER( starshp1_sspic_w ) { /* * Some mysterious game code at address $2CCE is causing * erratic images in the target explosion sequence. The * following condition is a hack to filter these images. */ if (data != 0x87) starshp1_ship_picture = data; } Removing that produces the effect seen in the video. However, no matter what type of ship you destroy, one of the explosion frames is always the same: http://philwip.mameworld.info/ssa.png http://philwip.mameworld.info/ssb.png I've asked a friend to check this behaviour against his machine. As for the slow game speed, it's noted in the source. Whoever wrote the driver couldn't make sense of the video timing in the schematics (and neither can I!).
No.04001 Smitdogg Senior Tester Mar 19, 2009, 16:42	OK thanks for looking into this, I updated my report slightly.
No.13916 palazzol Developer Jun 18, 2017, 23:16	I believe I have fixed all the issues cited here in MAME 0.186, but I don't have privileges to mark it closed here.
No.13917 B2K24 Senior Tester Jun 19, 2017, 01:06	I thought it was still too slow until I realized button 3 activates a faster speed like a turbo effect. I'll mark it closed and thank you for fixing it.