08178: slapfighb2: Initial Slap Fight screen has corrupted graphics

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08178	Graphics	Minor	Always	Jan 11, 2022, 11:01	Jan 11, 2022, 22:55

Tester	Robbbert	View Status	Public	Platform	MAME (Self-compiled)
Assigned To		Resolution	Bugs That Aren't Bugs	OS	Windows 10/11 (64-bit)
Status [?]	Resolved			Driver	toaplan/slapfght.cpp
Version	0.239	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08178: slapfighb2: Initial Slap Fight screen has corrupted graphics
Description	Initial Slap Fight screen has corrupted graphics
Steps To Reproduce	Start game, when the ENGLAND screen goes away you'll see the corrupt graphics in the top half of the screen. A bunch of white zeroes with some yellow flashing things in the centre.
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	slapfighb2

Attached Files

No.19673 Haze Senior Tester Jan 11, 2022, 11:48 edited on: Jan 11, 2022, 12:34	This is expected. The protection device supplies the title screen on the original. Some bootleg sets have that data in ROM instead, here they just didn't bother. The code does actually read from an area where the logo could be found, and slapfighb3 even contains a ROM there, but it's confirmed there were PCBs without that ROM populated (and without any position for it) This slapfighb2 set is most likely a bootleg of a bootleg. On real hardware, without the ROM there, the graphics for the title will either pull low or high depending on the PCB. IOW it could be 'fixed' by copying the ROM from slapfighb3, but since slapfighb2 is confirmed not to have it, that would be a hack, this set doesn't have a valid logo on the PCB.
No.19678 Osso Moderator Jan 11, 2022, 17:13	Setting as BTANB as per Haze's comment
No.19680 Robbbert Senior Tester Jan 11, 2022, 22:55	Thanks for the info. I'll pass it on to the person who asked about this issue.