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Diffstat (limited to 'src/devices/cpu/tms9900/tms9980a.h')
-rw-r--r--src/devices/cpu/tms9900/tms9980a.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/devices/cpu/tms9900/tms9980a.h b/src/devices/cpu/tms9900/tms9980a.h
index 23abc082eb1..e290cd39ac1 100644
--- a/src/devices/cpu/tms9900/tms9980a.h
+++ b/src/devices/cpu/tms9900/tms9980a.h
@@ -46,6 +46,7 @@ protected:
uint32_t execute_input_lines() const override;
void execute_set_input(int irqline, int state) override;
+ // The clock is internally divided by 4
virtual uint64_t execute_clocks_to_cycles(uint64_t clocks) const override { return (clocks + 4 - 1) / 4; }
virtual uint64_t execute_cycles_to_clocks(uint64_t cycles) const override { return (cycles * 4); }