arduino-0018-windows
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML>
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<HEAD>
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
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<META NAME="GENERATOR" CONTENT="Mozilla/4.06 [en] (X11; I; Linux 2.0.35 i686) [Netscape]">
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<TITLE>Memory Window Help</TITLE>
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</HEAD>
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<BODY>
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<H1>
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The Memory Window</H1>
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The Memory Window allows users to display and edit the contents of memory.
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The Memory Window Preferences controls all of the display characteristics
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of the Memory Window.
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<BR>
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<LI>
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<A HREF="#menus">Address Menu</A></LI>
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<LI>
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<A HREF="#display">Memory Display</A></LI>
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<LI>
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<A HREF="#prefs">Memory Window Preferences</A></LI>
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<H2>
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<HR WIDTH="100%"></H2>
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<H2>
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<A NAME="menus"></A>Address Menu</H2>
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<IMG SRC="images/mem_menu.gif" HEIGHT=66 WIDTH=160>
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<P>This pulldown menu contains the following three items.
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<DL>
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<DT>
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<A NAME="menus_auto"></A>Auto Update</DT>
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<DD>
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When selected, causes the Memory Window to update the display every.
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If it is not selected, the display will be frozen until it is selected
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or "Update Now" is selected.</DD>
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<DT>
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<A NAME="menus_now"></A>Update Now</DT>
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<DD>
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Forces the Memory Window to update the display immediately.</DD>
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<DT>
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<A NAME="menus_prefs"></A>Preferences</DT>
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<DD>
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Opens the <A HREF="#prefs">Memory Window Preferences</A> dialog.</DD>
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</DL>
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<H2>
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<HR WIDTH="100%"></H2>
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<H2>
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<A NAME="display"></A>Memory Display</H2>
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Like the <A HREF="register.html">Register Window</A>, the Memory Window
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display is organized into a spreadsheet. The address of any cell in the
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Display can be determined by appending the row and column headers for the
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cell. Optionally, an ASCII display of the memory appears at the right.
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Any non-ASCII-representable byte in memory will appear in the ASCII Display
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as a control character (a dot, ".", by default). The <A HREF="#pref">Memory
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Preferences Dialog</A> may be used to alter the appearance of the Memory
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Window.
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<P><A NAME="display_nav"></A>To navigate the Memory Window, use the mouse
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and click the cell of interest. As an alternative, pressing the arrow keys
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on the keyboard will focus successive cells, from left to right, top to
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bottom. The focus will wrap from left to right, so hitting the right arrow
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key will keep advancing the address of the cell selected.
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<H4>
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<A NAME="display_edit"></A>Editing Memory</H4>
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To edit memory, simply enter the new value of the memory into the cell
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and press the enter key on the keyboard. As with the
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<A HREF="register.html">Register
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Window</A>, be careful of the input format used to enter data -- the debugger
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is capable of parsing binary, octal, decimal, and hexadecimal values. All
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entries will be padded with leading zeroes, if necessary. After you
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hit enter, the memory window will automatically shift focus to the next
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cell.
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<P>To edit part of the value of a cell, you can use the mouse to poistion
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the cursor to the exact part of the value you want to change. You
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can also use the backspace key to delete part of the value without deleting
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the whole value.
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<P>Another way to edit memory is to edit the ASCII window. To do
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this, select a cell using the mouse. Then type in a new string.
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<H4>
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<A NAME="display_popup"></A>Memory Pop-up Menu</H4>
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Clicking the right mouse button while the mouse cursor lies within the
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bounds of any cell brings up the following menu:
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<P><IMG SRC="images/mem_popup.gif" HEIGHT=100 WIDTH=220>
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<DL>
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<DT>
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Auto Update</DT>
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<DL>
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<DT>
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When selected, the Memory Window will track changes in memory shown in
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the Display. When not selected, the Memory Window is "frozen", representing
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a "snapshot" of memory.</DT>
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</DL>
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<DT>
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Update Now</DT>
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<DL>
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<DT>
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Forces the Memory Window to update the display immediately.</DT>
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</DL>
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<DT>
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Go To <I>address</I></DT>
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<DD>
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The Memory Window Display is updated to show memory starting at address
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<I>address</I>.</DD>
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<DT>
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Open New Window at <I>address</I></DT>
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<DD>
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A new Memory Window is opened, displaying memory at address <I>address</I></DD>
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<DT>
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Preferences...</DT>
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<DD>
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Opens the Memory Window Preferences for editing the appearance of the Memory
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Window Display.</DD>
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</DL>
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<H2>
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<HR WIDTH="100%"></H2>
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<H2>
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<A NAME="prefs"></A>Memory Window Preferences</H2>
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Memory Window Preference Dialog governs the appearance of the Memory Window:
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the total number of bytes displayed, the size of each cell, ASCII control
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character.
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<P><IMG SRC="images/mem_pref.gif" HEIGHT=417 WIDTH=330>
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<H4>
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<A NAME="prefs_size"></A>Size of the Display Cells</H4>
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This attribute controls how many bytes appear in each cell. Valid cell
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sizes in the Memory Window may be:
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<DL>
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<DT>
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Byte</DT>
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<DD>
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Each cell is exactly one byte</DD>
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<DT>
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Half Word</DT>
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<DD>
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Cells are displayed with two bytes</DD>
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<DT>
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Word</DT>
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<DD>
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Each cell contains four bytes</DD>
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<DT>
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Double Word</DT>
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<DD>
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Cells contain eight bytes</DD>
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<DT>
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Float</DT>
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<DD>
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Each cell contains four bytes, displayed as a floating point number</DD>
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<DT>
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Double Float</DT>
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<DD>
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Cells are displayed as floating point, eight bytes each</DD>
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</DL>
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<H4>
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<A NAME="prefs_fmt"></A>Format of the Display Cells</H4>
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The Format option of the Memory Preferences Dialog governs how the debugger
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represents the memory. Possible representations include:
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<DL>
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<DT>
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Binary</DT>
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<DD>
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The values are shown as binary numbers</DD>
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<DT>
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Signed Decimal</DT>
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<DD>
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The values are shown as signed decimal numbers</DD>
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<DT>
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Octal</DT>
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<DD>
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Each cell is represented as an octal number</DD>
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<DT>
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Unsigned Decimal</DT>
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<DD>
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Values are displayed as unsigned decimals</DD>
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<DT>
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Hex</DT>
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<DD>
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Memory is displayed as a hexadecimal number. This is the default.</DD>
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</DL>
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<H4>
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<A NAME="prefs_bytes"></A>Size of the Memory Window</H4>
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The size of the memory window determines how much memory is actually presented
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to the user. The total number of bytes shown can either be determined by
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the size of the window, in which case resizing the Memory Window will cause
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more or less memory to be displayed, or fixed at some specified number
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of bytes. By default, the Memory Window shows 128 bytes of memory.
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<H4>
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<A NAME="prefs_misc"></A>Miscellaneous</H4>
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Miscellaneous memory preferences include the option to display the ASCII
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representation of the memory, including what character to use for non-ASCII
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bytes (the "control" character). Additionally, users may specify the number
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of bytes per row, either by typing a number into the box or by choosing one
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from the list. The default is sixteen bytes per row. If the entered value is
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not a multiple of the cell size then it will be automatically rounded up. The
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maximum permitted value is 150 (before rounding).
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</BODY>
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</HTML>
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