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<a name="1210161"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">1.2 Compatibility with previous versions</font>
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<a name="1222710"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">This release contains all the functionality of R1.9.6 patch 7, (unlike R2.0.4). An existing R1.9.6 patch 7 user may therefore migrate directly to R2.0.5.</font>
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<a name="1217977"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">This release is backwards compatible with all previous releases from R1.7 onwards; no changes are required to source code, except:</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1210163"> </a>From R1.8.1, some library functions have been moved to different library files. </font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1210164"> </a>From R1.8.1, the default effect of the order of <strong>st20cc</strong> parameters has changed. A new option is provided to keep the effect the same as in R1.8 and earlier toolsets. </font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1210165"> </a>The R1.8.1 and later <font size=2 face=Courier><strong>endorder</strong></font> behavior is not compatible with previous releases. If <font size=2 face=Courier><strong>endorder</strong></font> is used without a priority in a command language procedure called using the <strong>st20cc</strong> option <font size=2 face=Courier><strong>-p</strong></font>, the functions now run after the program exit. </font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1210166"> </a>From R1.8.1, OS20 interrupt handler library changes. See the <em>Interrupts</em> chapter of the <em>OS20 User Manual</em>.</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1210170"> </a>The implementation of C++ in this release is not compatible with C++ implementation in earlier toolset releases. Existing C++ modules will need to be recompiled.</font></p>
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<a name="1219076"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Compatibility issues with porting from toolsets before R1.7 are described in <a href="port.htm#1142939"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Appendix燙: Porting code from earlier toolsets</i></font></a>.</font>
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