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MS-5123 version 1.3
CPU Speed Setting (SW1)
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CPU Internal Clock
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SW1 Settings
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1
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2
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3
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(Int/Ext Ratio)
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4
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5
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6
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External Clock
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75MHz
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OFF
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OFF
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OFF
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1.5
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OFF
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ON
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ON
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50MHz
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90MHz
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OFF
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OFF
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OFF
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1.5
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OFF
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OFF
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ON
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60MHz
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100MHz
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OFF
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OFF
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OFF
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1.5
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OFF
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OFF
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OFF
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66MHz
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120MHz
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OFF
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ON
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OFF
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2
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OFF
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OFF
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ON
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60MHz
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133MHz
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OFF
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ON
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OFF
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2
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OFF
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OFF
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OFF
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66MHz
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150MHz
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OFF
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ON
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ON
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2.5
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OFF
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OFF
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ON
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60MHz
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166MHz
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OFF
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ON
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ON
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2.5
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OFF
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OFF
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OFF
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66MHz
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80MHz (See note)
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OFF
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OFF
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OFF
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2
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ON
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ON
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ON
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40MHz
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120MHz (see note
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ON
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OFF
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OFF
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3
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ON
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ON
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ON
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40MHz
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Note: The two settings are reserved for future M1CPUS
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3. CPU Voltage Selector: JV2
For jumper JV2 select either a 3.38 or 3.52 volt power source for
the P54C
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CPU Speed
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JV2
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3.38V
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Short
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3.52V
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Open
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