On-Board Slave

This is a Microchip 16F737 part installed on the Hardware Controller 3 in a socket (marked U10).

HWC3_640x.PNG (10.02 Kb)

This part cannot be field-reprogrammed without special tools, but it can be replaced by a skilled technician.

This part may be marked in any number of ways and may or may not include a version number. There is no reliable way to check the OB Slave firmware version in the field if the version number is not marked. However:
  • "HW3" usually means it is a pre-3.0 version unless it has a version number.
  • "AVI" was used for a while for v3.5 on Avionics motherboards despite the fact that the firmware is not Avionics-specific.
  • "OB" has recently been used, usually along with a version number. Chances are it's v3.5 or newer.

Right-click and select "Save Target As" (Internet Explorer) or "Save Link As" (FireFox) to download the Hex file. Otherwise your browser will probably just display the raw contents. Your browser may try to save it as a text file. More later.
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