[Info] Game image seems corrupt/does not start/fails on run

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The information in this article applies to the following versions of VICE:

• all versions

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SYMPTOMS

When trying to play a game or to run a program on the emulator, the program run in the emulator crashes or behaves unexpected.

CAUSE

There are several possible causes for this behaviour. The following is a list (in non-specific order) of these:

• The Program does not like "loosing" precision of emulation;
• The program needs true drive emulation enabled (applies to disk images only);
• The program needs virtual device traps disabled (applies to disk images only);
• The program uses very exact synchronization between floppy and computer (applies to disk images only);
• The program image is corrupted.
• Some other settings are not correct.

SOLUTION

To get the program to run, try the following one by one (in the given order):

• Disable WARP mode;
• Enable true drive emulation on the emulator;
• Disable virtual device traps;
• Use "idle method: NONE" in each of the drives' settings;
• enable reSID (which emulates the SID's behaviour much more correctly;
• use 1/1 refresh rate for the video;
• Try to get another game image; the best choice is to try another source.

Notice that the suggested settings to VICE affect performance, so you should only select them if you encounter this specific problem.

STATUS

This document is for information purpose only. The behaviour reported is intentional in the VICE versions listed at the beginning of this article.

REVISION

• January 29, 2003: Added hint for WARP mode and idle method
• December 11, 2001: Added hint for reSID and 1/1 refresh rate
• September 06, 2001: Original release of this document