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168 lines
7.0 KiB
HTML
168 lines
7.0 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8"/>
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<link rel="stylesheet" href="main.css"/>
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<title>Tools - 6502bench SourceGen</title>
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</head>
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<body>
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<div id="content">
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<h1>SourceGen: Tools</h1>
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<p>The <samp>Tools</samp> menu offers a selection of useful tools that
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operate independently of the current project (if any).</p>
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<h2 id="instruction-chart">Instruction Chart</h2>
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<p>This opens a window with a summary of all 256 opcodes. The CPU can
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be chosen from the pop-up list at the bottom. Undocumented opcodes for
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6502/65C02 are shown in italics, and can be excluded from the list
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by unchecking the box at the bottom.</p>
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<p>The status flags affected by each instruction reflect their behavior
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on the 65816. The only significant difference between 65816 and
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6502/65C02 is the way the <code>BRK</code> instruction affects the
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D and B/X flags.</p>
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<h2 id="ascii-chart">ASCII Chart</h2>
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<p>This opens a window with the ASCII character set. Each character is
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displayed next to its numeric value in decimal and hexadecimal. The
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pop-up list at the bottom allows you to flip between standard and "high"
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ASCII.</p>
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<h2 id="apple2-screen-chart">Apple II Screen Chart</h2>
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<p>The Apple II text and hi-res screens are mapped to memory in a way
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that makes sense to computers but is a little confusing for humans. This
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chart maps line numbers to addresses and vice-versa. Select different
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screens and sort orders from the list at the bottom.</p>
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<h2 id="hexdump">Hex Dump Viewer</h2>
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<p>You can use this to view the contents of the project data file
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by double-clicking the values in the "Bytes" column, or with
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<samp>Actions > Show Hex Dump</samp>.
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The viewer is displayed in a "modeless" dialog that does not
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prevent you from continuing to work with the project. If you
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double-click a different line in the project, the viewer will automatically
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highlight those bytes.</p>
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<p>You can also view the contents of arbitrary files by using
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<samp>Tools > Hex Dump</samp>. There is no fixed limit on the number of
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viewers you can have open simultaneously. (Be aware that the viewer
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currently loads the entire file into memory, and you will run out of room
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eventually. Not coincidentally, the viewer has a size limit of 16MiB
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per file.)</p>
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<p>You can select lines with the mouse as you would in any other list
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view. <kbd class="key">Ctrl+A</kbd> selects all lines.
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<kbd class="key">Ctrl+C</kbd> copies the selected lines to
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the system clipboard.</p>
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<p>The "character conversion" selector allows you to choose how the
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bytes are converted to characters for the Text column. Choose from
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the usual set of encodings.</p>
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<p>If <samp>ASCII-only dump</samp> is not checked, non-printable bytes
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are shown in the ASCII dump as a middle dot ('·'). If the option is
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checked, non-printable bytes are represented by a period ('.') instead.
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The use of non-ASCII characters makes the dump unambiguous when unprintable
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characters are mixed with periods, but the lines may be unsuitable for
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pasting in some forums.</p>
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<p>If <samp>always on top</samp> is checked, the window will stay above
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all other windows that don't also declare that they should always be on
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top. By default this box is checked when displaying project data, and
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not checked for external files.</p>
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<h2 id="file-concat">File Concatenator</h2>
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<p>The File Concatenator combines multiple files into a single file.
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Select the files to add, arrange them in the proper order, then hit
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<samp>Save</samp>. CRC-32 values are shown for reference.</p>
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<h2 id="file-slicer">File Slicer</h2>
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<p>The File Slicer allows you to "slice" a piece out of a file, saving
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it to a new file. Specify the start and length in decimal or hex. If
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you leave a field blank, they will default to offset 0 and the remaining
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length of the file, respectively.</p>
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<p>The hex dumps show the area just before and after the chunk to be
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sliced, allowing you to confirm the positions.</p>
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<h2 id="omf-converter">OMF Converter</h2>
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<p>This tool allows you to view Apple IIgs Object Module Format (OMF)
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executables, and convert them for disassembly.</p>
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<p>OMF executables have multiple segments with relocatable code. References
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to addresses aren't filled in until the program is loaded into memory,
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which makes it difficult to disassemble the file. The conversion tool
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loads the OMF file in roughly the same way the GS/OS System Loader would,
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placing each segment at the start of a bank unless otherwise directed.
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The loaded image is saved to a new file, and a SourceGen project file is
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created with some basic attributes filled in.</p>
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<p>Only "Load" files (S16, PIF, TOL, etc) may be converted. Compiler object
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files and libraries (OBJ, LIB) contain references that must be resolved by
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a IIgs linker, and are not supported.</p>
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<p>Before you can examine or convert a file, you must first extract
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it from the Apple II disk image, using a mode that does not modify the
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original (e.g. extract with "configure to preserve Apple II formats"
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in CiderPress). Then, open it with <samp>Tools > Convert OMF</samp>.</p>
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<p>The initial view shows all of the OMF segments in the file. Double-clicking
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on an entry opens a detailed view that shows the segment header and a
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list of all the OMF records. For load files, the relocation dictionary is
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also shown.</p>
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<p>To convert the file, click <samp>Generate</samp> to create a
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modified binary and a SourceGen project file.</p>
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<p>If <samp>offset segment start by $0100</samp> is checked, the
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converter will try to shift the segment's load address from
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<code>$xx/0000</code> to <code>$xx/0100</code>. This can make the
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generated code a little nicer to work with because it removes potential
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ambiguity with direct page addresses. For example, <code>LDA $56</code>
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and <code>LDA $0056</code> may be interpreted as the same thing by the
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assembler, requiring generation of operand width disambiguators. By
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shifting the initial address we avoid the potential ambiguity.</p>
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<p>Check <samp>add comments and notes for each segment</samp> to add a
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long comment and a note at the start of each segment. The comments
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include the segment name, type, and optional flags. The notes just
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provide a quick way to jump to a segment.</p>
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<p>The binary generated by the tool is not in OMF format and will not
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execute on an Apple IIgs. To be functional, the generated sources must be
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assembled by a program capable of generating OMF output, such as Merlin.</p>
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<p>The <a href="advanced.html#reloc-data">relocation dictionaries</a> from
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the executable are included in the project file, and can be used to guide
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the disassembler's analysis. The <samp>use reloc data</samp> setting in
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the project properties controls this feature.</p>
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<p>A full explanation of the structure of OMF is beyond the scope of this
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manual. For more information on OMF, see Appendix F of the GS/OS Reference
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Manual.</p>
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