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diff --git a/Makefile b/Makefile
index 3e7941c..8c54b71 100644
--- a/Makefile
+++ b/Makefile
@@ -181,6 +181,10 @@ else
endif
endif
+ifneq (,$(CYCLE_LIMIT))
+ COMMONFLAGS += -DCYCLE_LIMIT=$(CYCLE_LIMIT)
+endif
+
ifeq ($(BUILD),DEBUG)
BUILDDIR := debug
CFLAGS := -DDEBUG -D_DEBUG -g -O0
diff --git a/dosbox_pure_libretro.cpp b/dosbox_pure_libretro.cpp
index 4f4ca7e..40ddef3 100644
--- a/dosbox_pure_libretro.cpp
+++ b/dosbox_pure_libretro.cpp
@@ -544,15 +544,30 @@ void DBP_SetRealModeCycles()
(year > 1999 ? 500000 : // Pentium III, 600 MHz and later
Cycles1981to1999[year - 1981]))); // Matching speed for year
+#ifdef CYCLE_LIMIT
+ if (CPU_CycleMax > CYCLE_LIMIT)
+ {
+ CPU_CycleMax = CYCLE_LIMIT;
+ CPU_AutoDetermineMode &= ~(CPU_AUTODETERMINE_CYCLES|(CPU_AUTODETERMINE_CYCLES<<CPU_AUTODETERMINE_SHIFT));
+ CPU_CycleAutoAdjust = true;
+ // Switch to dynamic core
+ if (CPU_AutoDetermineMode & CPU_AUTODETERMINE_CORE)
+ {
+#else
+
// Switch to dynamic core for newer real mode games
if (CPU_CycleMax >= 8192 && (CPU_AutoDetermineMode & CPU_AUTODETERMINE_CORE))
{
+#endif
#if (C_DYNAMIC_X86)
if (cpudecoder != CPU_Core_Dyn_X86_Run) { void CPU_Core_Dyn_X86_Cache_Init(bool); CPU_Core_Dyn_X86_Cache_Init(true); cpudecoder = CPU_Core_Dyn_X86_Run; }
#elif (C_DYNREC)
if (cpudecoder != CPU_Core_Dynrec_Run) { void CPU_Core_Dynrec_Cache_Init(bool); CPU_Core_Dynrec_Cache_Init(true); cpudecoder = CPU_Core_Dynrec_Run; }
#endif
}
+#ifdef CYCLE_LIMIT
+ }
+#endif
}
static bool DBP_NeedFrameSkip(bool in_emulation)
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