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Old 09 February 2014, 15:45   #1
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Config file backward compatibility

A little tip for anyone having issues using a config saved with WinUAE 2.7.0 with earlier WinUAE versions...

I wanted to use my current config with an earlier version of WinUAE. But since adjusting the config and saving with a newer version, something about it causes older versions to crash.

The config works with WinUAE 2.7.0. With WinUAE 2.6.1, loading and starting emulation gives this log output:
JIT: Can't handle access 00839A40!
JIT: Can't handle access 7BC52DE4!
... that line repeated many times ...
JIT: Can't handle access 7BC52DE4!
Segmentation fault

Loading the config, disabling JIT and starting emulation just reports
Segmentation fault

Similar result with WinUAE 2.6.0, except there without JIT it reports:
ExceptionFilter Trap: 09B96AAC 38E800E2 00000000
Segmentation fault

It turns out that the cause of the problem was using the new line mode settings in WinUAE 2.7.0. In the config I have line mode set to Double and interlaced line mode set to Double, fields. For whatever reason earlier versions of WinUAE don't like that; no Line mode radio button is selected when I load the config. After setting line mode to Double I was able to start emulation as normal.
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