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ECN-0126

Title ST90R40 Adaptor Board.
Equipment All desks using a Borris2 motherboard.
Author Alwyn Fernandes
Drawing No n/a
Date 25th July 2000

 

Reason for ECN The ST90R40 used on Borris2 is no longer available
Special Parts Required Replacement board SAB 6815A
Part No : 1201-6815AA
Special Tools Required none

 

Work Required

Do NOT fit the following components on the Borris2 motherboard (BRS 1050C) :-
  • Crystal X300 (24MHz)
  • Capacitors C300 and C301 (22pF)
  • Capacitor BY300 (100nF)
  • The 68pin PLCC socket for IC300 and the ST90R40 processor.

Fit the following to the Borris2 motherboard :-

  • In place of the 68pin PLCC socket fit six 9way pin headers (03-05-0014)
    and two 7way pin headers (03-05-0013).

Assembly Details

  • Carefully fit the assembled ST Adaptor Board (SAB 6815A) onto the pin headers on the Borris2 motherboard – labelled IC300.
    Ensure that the adaptor board is firmly secured by the M3 screw.
  • Fit a jumper in position 4 of the Program Links on Borris2
    - click here to see a picture
  • Update the AVOS in the desk.
  • Update the desk software.