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ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
07874 Save/Restore Major Always Feb 12, 2021, 07:58 Feb 13, 2021, 18:20
Tester Osso View Status Public Platform MAME (Official Binary)
Assigned To Osso Resolution Fixed OS Windows 10 (64-bit)
Status [?] Resolved Driver
Version 0.228 Fixed in Version 0.229 Build 64-bit
Fixed in Git Commit Github Pull Request #
Summary 07874: cobram3, cobram3a: The games only show a black screen when a NVRAM is present
Description Without a NVRAM (i. e. the first time you run them) the game work fine. If you quit and launch them again without deleting the NVRAM, they don't boot, stopping at a black screen.
Steps To Reproduce 1) Make sure you have no NVRAM file in nvram\cobram3\
2) Launch the game - game will work
3) Exit the game
4) Launch the game again - only a black screen
Additional Information I believe regression is
The NVRAM size was moved from 0x1000 to 0x3000. At 0x1000 this game seems to use normal (work) RAM. Reducing the size of the NVRAM to 0x1000 again and putting 0x2000 of normal RAM thereafter makes the game work even with an NVRAM present.
I think the NVRAM size was augmented as a shortcut to avoid creating two maps, one for games which have ROM in the 0x1000 - 0x2fff range and one for games which have normal RAM there. I don't think there are game which really have 0x3000 of NVRAM. If someone can confirm my suspicions, I'll take care of doing this with the two different maps.

Originally reported by Guru.
Github Commit
Regression Version 0.227
Affected Sets / Systems cobram3, cobram3a
Attached Files
There are no relationship linked to this issue.
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Senior Tester
Feb 12, 2021, 12:36
Issue confirmed by hap.