1. At the menu bar, click "File" followed by "Options"
2. Check the "Expert User Menu" and the following options will become available :
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Switch Compiler allows switching between "Interpreter" and "Dynamic Compiler" during game play
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unless you want to see if the slow interpreter can play something that the dynarec cannot. This option will always
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revert to dynarec on rom close by design

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Dyna Code Checking allows dynamic switching of self modifying code from "No check" to "Block and DMA"
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Refer to Glossary for details on each item
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Counter Hack allows the CF value to be changed from CF1 to CF8 during game play
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The highest the number, the riskier the emulation stability becomes, but in general, a higher number can speed up graphics and
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slow audio/or vice versa. CF7 and CF8 are really quirky. But games like DOOM and Quake like them.