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added BIOS in system programming header information
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https://www.mxic.com.tw/en-us/products/NOR-Flash/Serial-NOR-Flash/Pages/spec.aspx?p=MX25L6445E&m=Serial+NOR+Flash&n=PM1736
 
https://www.mxic.com.tw/en-us/products/NOR-Flash/Serial-NOR-Flash/Pages/spec.aspx?p=MX25L6445E&m=Serial+NOR+Flash&n=PM1736
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There is also an unpopulated/keyed box header "E16" near the BIOS chip, probably meant for in system programming. Here is the pin mapping:
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{| class="wikitable"
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! U19 Pin
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! E16 Pin
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! Function
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|-
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| 1
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| 1/2
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| CS#
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|-
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| 2
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| 5
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| SO/SIO1
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|-
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| 3
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|
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| WP#/SIO2
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|-
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| 4
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| 8
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| GND
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|-
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| 5
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| 3
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| SI/SIO0
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|-
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| 6
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| 7
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| SCLK
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|-
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| 7
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|
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| NC/SIO3
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|-
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| 8
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| 6
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| VCC
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|}
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NOTE: E16 has a very low resistance resistor between pins 1 & 2, thus they are effectively tied together.
    
== Online Resources ==
 
== Online Resources ==

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