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DESERIALIZATION
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P5.HTM.orig
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<HTML>
<HEAD>
<TITLE>pg 05</TITLE>
</HEAD>
<BODY BGCOLOR="#ffffff">
<P><CENTER><FONT COLOR="#000000"><BR>
<IMG SRC="pg05hex1.jpg" WIDTH="382" HEIGHT="163" ALIGN="BOTTOM"
BORDER="0" NATURALSIZEFLAG="3"></FONT></CENTER></P>
<P><CENTER><FONT COLOR="#000000" SIZE="-1">Tool information block
<B>before</B> installation</FONT></CENTER></P>
<P><FONT COLOR="#000000">The bytes in positions $42-$45 contain
the serial number of the Lisa on which the tool was installed
The above figure contains a serial number of 0 (zero). When the
tool is installed on a Lisa, the Lisa's serial number will<B>
</B>be stored in the tool information block at position $42-$45.
After installing LisaCalc on my computer, the tool information
block changed as follows:</FONT></P>
<P><CENTER><BR>
<BR>
<B><FONT COLOR="#000000" SIZE="-1"><IMG SRC="pg05hex2.jpg" WIDTH="376"
HEIGHT="171" ALIGN="BOTTOM" BORDER="0" NATURALSIZEFLAG="3"></FONT></B></CENTER></P>
<P><CENTER><FONT SIZE="-1">Tool information block <B>after</B>
installation</FONT></CENTER></P>
<P>My Lisa has the serial number 70,935 which is equivalent to
$00011517. When a Lisa attempts to use a tool it f I rst checks
the tool's serial number from the tool information block against
the Lisa's unique serial number. If the serial numbers match,
then the tool can be used. If the serial numbers do not match
then the Lisa informs the user with a dialog that the tool is
not licensed for this Lisa.</P>
<P>Let's say you have a Lisa with the serial number 75,536 ($0001253B).
To find the serial number of your Lisa, select the Preferences
tool icon and select the File/Print menu command "Attributes
of ...". The serial number will be shown in the Information
box. Use FEdit to modify positions $42-$45 to your hexadecimal
serial number. After</P>
<P><CENTER><FONT COLOR="#000000"><BR>
(1988) Apple Lisa 7/7 Deserialization 3 of 4</FONT></CENTER></P>
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