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USER CONFIGURABLE SETTINGS
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Function
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Jumper
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Position
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Factory configured - do not alter
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J3
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Open
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Factory configured - do not alter
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J4
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Open
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Memory select 2 wait states/ I/O select 6 wait states
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J5
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Closed
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Memory select 1 wait state/ I/O select 4 wait states
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J5
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Open
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BIOS type select 27256
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J6
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pins 1 & 2 closed
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BIOS type select 27512
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J6
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pins 2 & 3 closed
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CPU speed select 20MHz
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J9
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Open
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CPU speed select 25MHz
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J9
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Closed
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CPU speed select switchable from keyboard
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J15
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pins 2 & 3 closed
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CPU speed select fast
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J15
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pins 1 & 2 closed
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CPU speed select slow
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J15
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Open
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Bus speed select iOSC/2
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J17
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pins 1 & 2 closed
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Bus speed select 8MHz
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J17
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pins 2 & 3 closed
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Shadow RAM enabled
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SW1/switch 6
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closed
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Shadow RAM disabled
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SW1/switch 6
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open
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DRAM read select 2 wait states/write select 2 wait states
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SW1/switch 7
SW1/switch 8
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closed
closed
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DRAM read select 2 wait states/write select 1 wait state
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SW1/switch 7
SW1/switch 8
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closed
open
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DRAM read select 1 wait state/write select 1 wait state
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SW1/switch 7
SW1/switch 8
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open
open
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NPU enabled
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SW1/switch 9
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closed
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NPU disabled
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SW1/switch 9
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open
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Monitor type select monochrome
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SW1/switch 10
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open
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Monitor type select color
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SW1/switch 10
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closed
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