01475: [debug] Screenless systems are broken because of a vblank callback

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
01475	Crash/Freeze	Critical (emulator)	Always	Mar 10, 2008, 18:44	Mar 14, 2008, 05:20

Tester	Duke	View Status	Public	Platform	Other
Assigned To		Resolution	Fixed	OS	Linux
Status [?]	Resolved			Driver
Version	0.123u4	Fixed in Version	0.123u6	Build	Debug
		Fixed in Git Commit		Github Pull Request #

Summary	01475: [debug] Screenless systems are broken because of a vblank callback
Description	All screenless systems are currently broken. They die with the following assert: src/emu/video.c:1121: video_screen_register_vbl_cb: Assertion `screen != ((void )0)' failed. The problem is in the function input_port_post_init() in src/emu/inptport.c: void input_port_post_init(running_machine machine) { /* set up callback for updating the ports */ video_screen_register_vbl_cb(machine, NULL, on_vblank); } This code sets up a vblank callback regardless if there are screens or not. If there are no screens, the code fails with the above assert.
Steps To Reproduce	Run any driver with a screenless system.
Additional Information
Github Commit

Flags	Debug build specific
Regression Version	0.123u4
Affected Sets / Systems

Attached Files

No.00087 Tafoid Administrator Mar 10, 2008, 21:10	This appears a repeat of reported 01463. Linked as a child problem.
No.00128 aaron Developer Mar 13, 2008, 23:28	The code referenced above no longer exists. I'm hesitant to state for sure that the bug is fixed, however. It should be retested in 0.123u5.