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<var class="product">Fast/Reload</var> provides support for mixed and pure DBCS (Double Byte Character Set) fields.
This includes support of the X'0080', X'0040', X'0020', and X'0010' <var>FLOD</var> mode bits.
For more information on these bits,
see the [[Media:M204_DBCSSupportGuide_V75.pdf|Rocket Model 204 DBCS Support Summary]].

In addition, <var class="product">Fast/Reload</var> performs certain DBCS conversions automatically
when loading data in <var>UAI</var>/<var>LAI</var> format.
These conversions are performed
automatically when a field's <var>DBCS</var> definition has changed.
The possible DBCS conversions are:
<table>
<tr><td>Pure DBCS to mixed DBCS</td>
<td>No conversion is performed.</td></tr>

<tr><td>Pure DBCS to mixed DBCS</td>
<td>Data is wrapped in shift/out and shift/in.</td></tr>

<tr><td>Pure DBCS to non-DBCS</td>
<td>The data is stored as a string with no modification.</td></tr>

<tr><td>Mixed DBCS to pure DBCS</td>
<td>The data must be wrapped in shift/out and shift/in with no intervening shift/out or shift/in.
If this is the case, the shift/out and shift/in are stripped. If not, an error message is issued and the field is not loaded.</td></tr>

<tr><td nowrap>Mixed DBCS to mixed DBCS</td>
<td>No conversion is performed.</td></tr>

<tr><td>Mixed DBCS to non-DBCS</td>
<td>The data is stored as a string with no modification.</td></tr>

<tr><td>Non-DBCS to pure DBCS</td>
<td>This conversion is invalid so an error message is issued and the field is not loaded in this case.</td></tr>

<tr><td>Non-DBCS to mixed DBCS</td>
<td>The data is stored as a string with no modification other than conversion of non-string types to string.</td></tr>
</table>

If DBCS data is stored in a field that was not defined as a <var>DBCS</var> field,
it is possible to tell <var class="product">Fast/Reload</var> to treat the field as if it had been a <var>DBCS</var> field.
This is done with the <b>PURE</b> and <b>MIXED</b> statements.
The <var>PURE</var> statement tells <var class="product">Fast/Reload</var> to treat the unloaded
data for a field as if it were pure DBCS data, regardless of its actual definition.
The <var>MIXED</var> statement tells <var class="product">Fast/Reload</var> to treat the unloaded
data for a field as if it were mixed <var>DBCS</var> data, regardless of its actual definition.
Both the <var>PURE</var> and the <var>MIXED</var> statements must come after the <var>LAI</var> statement,
and they are invalid in non-<var>LAI</var> <var>FLOD</var> programs.

For example, this statement
treats data for field <code>DBCS_STRING</code> as pure DBCS
data, and it treats data for field <code>OTHER_STRING</code> as mixed DBCS data:
<p class="code">FILELOAD -1,-1,0,1000000,10000,10000,,68
LAI
PURE DBCS_STRING
MIXED OTHER_STRING
END
</p>

==See also==
{{Template:Fast/Reload topic list}}

[[Category:Fast/Reload]]

Fast/Reload DBCS support - Revision history

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