tms99xx: Checked min/max cycles, reverted tms9980a clock change.

src/devices/cpu/tms9900/tms9900.cpp

@@ -2746,15 +2746,22 @@ void tms99xx_device::alu_int()
 }
 
 /**************************************************************************/
+
+/*
+    The minimum number of cycles applies to a command like STWP R0.
+*/
 uint32_t tms99xx_device::execute_min_cycles() const
 {
-	return 2;
+	return 8;
 }
 
-// TODO: Compute this value, just a wild guess for the average
+/*
+    The maximum number of cycles applies to a DIV command, depending on the
+    data to be divided, and the mode of adressing.
+*/
 uint32_t tms99xx_device::execute_max_cycles() const
 {
-	return 10;
+	return 124;
 }
 
 uint32_t tms99xx_device::execute_input_lines() const

src/devices/cpu/tms9900/tms9980a.cpp

@@ -80,7 +80,6 @@
 /****************************************************************************
     Constructor
 ****************************************************************************/
-
 tms9980a_device::tms9980a_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock)
 	: tms99xx_device(mconfig, type, tag, 8, 14, 11, owner, clock)
 {
@@ -277,15 +276,22 @@ void tms9980a_device::acquire_instruction()
 
 
 /**************************************************************************/
+
+/*
+    The minimum number of cycles applies to a command like STWP R0.
+*/
 uint32_t tms9980a_device::execute_min_cycles() const
 {
-	return 2;
+	return 12;
 }
 
-// TODO: Compute this value, just a wild guess for the average
+/*
+    The maximum number of cycles applies to a DIV command, depending on the
+    data to be divided, and the mode of adressing.
+*/
 uint32_t tms9980a_device::execute_max_cycles() const
 {
-	return 10;
+	return 136;
 }
 
 uint32_t tms9980a_device::execute_input_lines() const

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); }
 

src/devices/cpu/tms9900/tms9995.cpp

@@ -3471,14 +3471,22 @@ void tms9995_device::alu_int()
 }
 
 /**************************************************************************/
+/*
+    The minimum number of cycles applies to a command like SETO R0 with
+    R0 in on-chip RAM.
+*/
 uint32_t tms9995_device::execute_min_cycles() const
 {
-	return 2;
+	return 3;
 }
 
+/*
+    The maximum number of cycles applies to a STCR command with the destination
+    operand off-chip and 16 bits of transfer.
+*/
 uint32_t tms9995_device::execute_max_cycles() const
 {
-	return 44;
+	return 47;
 }
 
 uint32_t tms9995_device::execute_input_lines() const