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| =Memory Layout=
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| The Siemens GS20 transmission control unit (TCU) can be seperated into three major sections, first the bootloader, followed by the calibration data and then the actual programm code.
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| Its interesting that the Siemens unit follows the same firmware layout usually known from Bosch units with a C167 from that era.
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| Codewise it is therefor more similar to a Bosch ME7 ECU than to the Siemens MS42 or MS43. Axises and item names are also Bosch instead of Siemens.
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| See this table for binary data areas:
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| {| class="wikitable"
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| ! style="text-align: center; font-weight:bold;" | Start
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| ! style="text-align: center; font-weight:bold;" | End
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| ! style="text-align: center; font-weight:bold;" | Section
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| ! style="text-align: center; font-weight:bold;" | Size
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| |-
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| | style="text-align: center; background-color:#fe996b;" | 00000
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| | style="text-align: center; background-color:#fe996b;" | 0FFFF
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| | style="text-align: center; background-color:#fe996b;" | Bootloader Code
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| | style="text-align: center; background-color:#fe996b;" | 64 kByte
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| |-
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| | style="text-align: center; background-color:#9aff99; color:#000000;" | 10000
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| | style="text-align: center; background-color:#9aff99; color:#000000;" | 1FFFF
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| | style="text-align: center; background-color:#9aff99; color:#000000;" | Calibration Data
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| | style="text-align: center; background-color:#9aff99; color:#000000;" | 64 kByte
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| |-
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| | style="text-align: center; background-color:#fffc9e;" | 20000
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| | style="text-align: center; background-color:#fffc9e;" | 2FFFF
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| | rowspan="6" style="text-align: center; background-color:#fffc9e;" | Program Code
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| | rowspan="6" style="text-align: center; background-color:#fffc9e;" | 384 kByte
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| |-
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| | style="text-align: center; background-color:#fffc9e; color:#000000;" | 30000
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| | style="text-align: center; background-color:#fffc9e; color:#000000;" | 3FFFF
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| |-
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| | style="text-align: center; background-color:#fffc9e; color:#000000;" | 40000
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| | style="text-align: center; background-color:#fffc9e; color:#000000;" | 4FFFF
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| |-
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| | style="text-align: center; background-color:#fffc9e; color:#000000;" | 50000
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| | style="text-align: center; background-color:#fffc9e; color:#000000;" | 5FFFF
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| |-
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| | style="text-align: center; background-color:#fffc9e; color:#000000;" | 60000
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| | style="text-align: center; background-color:#fffc9e; color:#000000;" | 6FFFF
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| |-
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| | style="text-align: center; background-color:#fffc9e; color:#000000;" | 70000
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| | style="text-align: center; background-color:#fffc9e; color:#000000;" | 7FFFF
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| |}
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