83Plus:OS:Memory Layout

2007-07-09T19:58:05Z

Goplat: resolve -1/+1 ambiguity

[[Category:83Plus:OS Information|Memory Layout]]
== Memory Layout ==
This table describes how the RAM is organized.

<table border="1" cellspacing="0" cellpadding="2">
<tr><th>Address</th><th>Description</th></tr>

<tr><td>[[83Plus:RAM:8000|appData]] to [[83Plus:RAM:9D95|userMem]]-1</td>
<td>System RAM: Used by the OS to store various pointers, settings, buffers, etc.</td></tr>

<tr><td>[[83Plus:RAM:9D95|userMem]] to ([[83Plus:RAM:9820|tempMem]])-1</td>
<td>User Memory: This is where all variables are stored.</td></tr>

<tr><td>([[83Plus:RAM:9820|tempMem]]) to ([[83Plus:RAM:9822|FPBase]])-1</td>
<td>Temp Memory: This is where the OS stores temporary variables.</td></tr>

<tr><td>([[83Plus:RAM:9822|FPBase]]) to ([[83Plus:RAM:9824|FPS]])-1</td>
<td>Floating Point Stack: A LIFO stack for floating point number (or variable names).</td></tr>

<tr><td>([[83Plus:RAM:9824|FPS]]) to ([[83Plus:RAM:9828|OPS]])</td>
<td>Free RAM.</td></tr>

<tr><td>([[83Plus:RAM:9828|OPS]])+1 to ([[83Plus:RAM:9826|OPBase]])</td>
<td>Operator Stack: A LIFO stack used to parse expressions and to store return information when a TI-Basic program is called from another TI-Basic program. TI won't tell anything about this.</td></tr>

<tr><td>([[83Plus:RAM:9826|OPBase]])+1 to ([[83Plus:RAM:982E|pTemp]])</td>
<td>Variable Allocation Table (VAT) for temporary variables.</td></tr>

<tr><td>([[83Plus:RAM:982E|pTemp]])+1 to ([[83Plus:RAM:9830|progPtr]])</td>
<td>Variable Allocation Table (VAT) for programs,appvars,groups and lists with variable length names.</td></tr>

<tr><td>([[83Plus:RAM:9830|progPtr]])+1 to [[83Plus:RAM:FE66|symTable]]</td>
<td>Variable Allocation Table (VAT) for all variables with a fixed name: reals, strings, ans, functions, matrices, etc.</td></tr>

<tr><td>[[83Plus:RAM:FE66|symTable]]+1 to $FFFF</td>
<td>Hardware Stack</td></tr>
</table>

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83Plus:OS:Memory Layout