Files in this zip
-----------------
    s3apat1.txt         This documentation
    s3apat1.img         The patch program
    s3auar1.pdd         Used by the patch program

Description of problem
----------------------
In some circumstances, the S3a "Usage monitor" dialog can
over-estimate, by up to a factor of two, the amount of current being
used by the S3a.  Eg an average current of around 60mA can be shown,
whereas the actual figure should be around 30mA.

These circumstances are when Remote Link has been turned on, and then
turned off again BEFORE the 3-link cable has been removed from the
expansion port.  (Or if you make any other use of the serial port,
such as the Comms program, and close down that program before pulling
out the cable.)

Note that the ACTUAL current used in this case is correct, ie the
same as before turning Remote Link on.  It is only the ESTIMATE of
the current consumption that is incorrect.

Note also that, as it happens, this over-estimate does not occur if
users pull out the 3-link cable before turning Remote Link off (nor
does it happen if they leave Remote Link on all the time, regardless
of whether the cable is plugged in).

The patch
---------
A simple patch is available, with the effect that the current used is
correctly estimated in all cases.  Anyone who wishes to have a more
accurate value displayed in the "Usage monitor" dialog should apply
the patch as follows:
    1. Copy both the files S3aPAT1.IMG and S3aUAR1.PDD onto the \IMG
       directory of an SSD (or on internal memory)
    2. Select the entry S3aPAT1 under the RunImg icon in the System
       screen, and press ENTER.  (The program S3aPAT1.IMG exits
       almost at once.)
    3. That's all!

Once the patch is applied, there is no need to keep these two files
in place.  However, the patch will need to be reapplied if the S3a
is ever reset.

Trying to apply the patch twice is harmless.  So is trying to apply
the patch to an S3a with an operating system that doesn't need the
patch.

Note again that the patch has no other effect on the operation of the
S3a, and that there is no need to apply it, other than for more
accurate information purposes.