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ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
09539 DIP/Input Minor Always 16 hours ago 1 hour ago
Tester Marcher View Status Public Platform MAME (Official Binary)
Assigned To Resolution Open OS Windows (x64)
Status [?] Confirmed Driver
Version 0.288 Fixed in Version Build x64
Fixed in Git Commit Github Pull Request #
Summary 09539: macplus: Mouse cursor gets dragged to nearest screen corner/edge during disk loading
Description On macplus specifically (not reproduced on mac128k or mac512k), the mouse cursor intermittently gets pulled toward the nearest screen corner during loading (system boot, application launch/close, etc.). This lasts for the duration of the loading event and makes normal cursor movement effectively impossible while it's happening.

The cursor keeps appearing at the nearest corner/edge during loading of something - the system, an application, etc. No matter how you try to drag it during loading, it seems to get stuck, and for the entire duration of the loading it keeps being pulled toward the nearest monitor corner/edge, making cursor movement during loading very difficult and unpleasant. Notably, if you stop moving the mouse before loading starts and don't move it during loading, it stays in place - though any micro-movement causes it to jump to the nearest corner/edge.
Steps To Reproduce - Run macplus, boot sys11
- Move the mouse during any loading episode
- See the cursor runaway toward a corner/edge of the screen.
Additional Information I've watched a few videos on YouTube where people are using a real Macintosh Plus and moving the mouse during loading. They don't have this problem, so it's most likely an emulation bug.
Github Commit
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Regression Version
Affected Sets / Systems macplus
Attached Files
mp4 file icon 2026-08-28 19-55-11.mp4 (2,658,144 bytes) 16 hours ago Uploaded by Marcher
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No.24654
Robbbert
Moderator
1 hour ago
I didn't get the exact issue that's described, but there's certainly problems.

First time, the mouse was flickering about the top right corner, like what happens if a mouse is on the edge of the mouse pad.

Second time, the mouse got stuck on the left side, and can only be moved up and down. Can't move across. This is more severe as the emulation is unusable.