Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
07262 Crash/Freeze Major Always Mar 18, 2019, 05:32 Apr 3, 2023, 00:49
Tester trj View Status Public Platform MAME (Official Binary)
Assigned To Resolution Open OS Windows 10 (64-bit)
Status [?] Confirmed Driver
Version 0.204 Fixed in Version Build 64-bit
Fixed in Git Commit Github Pull Request #
Summary MESS-specific 07262: tg16 [campcali]: Graphic issue followed by freeze.
Description map screen has smaller graphic issues (with flying bird).

When gameplay begins, car has graphic issues and screen freezes.
Steps To Reproduce Load game. Hit run a few times to begin.

On the map screen you will see the bird has graphic/sprite issues.

Then hit run for 2 screens and then the car will be split and shown on different locations on the screen followed by a freeze.
Additional Information
Github Commit
Regression Version
Affected Sets / Systems tg16 [campcali]
Attached Files
jpg file icon Capture2.JPG (114,941 bytes) Mar 18, 2019, 05:32 Uploaded by trj
Screen showing Car graphic issue plus freeze point
There are no relationship linked to this issue.
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Apr 3, 2023, 00:49
Crashes because SW code is very unsafe, so while it's setting up a st0 #00 at PC=$82c0 then it gets a vblank irq, that changes up the 6270 register index to CR ($5), causing the crash. Can be bypassed by putting a breakpoint at $82c2,pc-=2 on first time each stage is started.
Culprit may be the vblank is firing at the wrong time (it sets up a screen of 224 active lines, which isn't quite common in PCE land), the core should be converted to interruptible opcodes or better VRAM waitstate penalties (particularly DMA).