Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
08839 Debugger Minor Always Mar 21, 2024, 12:07 Mar 24, 2024, 01:40
Tester Robbbert View Status Public Platform MAME (Self-compiled)
Assigned To hap Resolution Fixed OS Windows 10/11 (64-bit)
Status [?] Resolved Driver
Version 0.263 Fixed in Version 0.265 Build 64-bit
Fixed in Git Commit 4113b55 Github Pull Request #
Summary 08839: ngp, ngpc: debugger misbehaves
Description After using the do pc command, the debugger steps a wrong number of bytes causing the system to misbehave.

CPU = TMP95C061
Steps To Reproduce 1. Start the system: mame ngp -d
2. You are at FF1800. Step 3 times. Now you are at FF1809.
3. Type in: pc=FF1807
4. This should return you to the previous line. Step once. This should bring you back to FF1809.
5. However we are now at FF180A, and the disassembly has changed.

This problem can occur anywhere with this CPU, and sometimes proceeding can make the system freeze.

I tried at another address, and instead of stepping 3 bytes, sometimes it was 1 or 2. Unfortunately this makes the debugger almost useless.
Additional Information
Github Commit
Regression Version
Affected Sets / Systems ngp, ngpc
Attached Files
There are no relationship linked to this issue.
There are no notes attached to this issue.