6502bench SourceGen: Main Window

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Starting a New Project

Select File > New, or if no project is open, click "Start new project". This opens the Create New Project window.

Start by selecting your target system from the tree on the left. The panel on the right will show the CPU that will be selected, as well as the symbol files and extension scripts that will be loaded by default. All of these may be overridden later from the project properties. (If the description in the panel on the right says "[placeholder]", it means that the system doesn't yet have a set of symbols defined for it.)

Next, click the "Select File..." button. Pick the file you wish to disassemble. The dialog will update with the pathname and some notes about the file's size. Click "OK" if all looks good to create the project.

NOTE: Support for large 65816 programs is incomplete. The maximum size for a data file is currently 1 MiB.

The first time you save the project (with File > Save), you will be prompted for the project name. It's best to use the data file's name with ".dis65" added, so this will be set as the default. The data file's name is not stored in the project file, so if you pick a different name, or save the project in a different directory, you will have to select the data file manually whenever you open the project.

Opening an Existing Project

Select File > Open, or if no project is open, click "Open existing project". Select the .dis65 project file from the standard file dialog.

SourceGen will try to open a data file with the project's name, minus the ".dis65". If it can't find a file with that name, or if there's something wrong with it (e.g. the CRC doesn't match), you will be given the opportunity to specify the location of the data file to use.

If non-fatal problems with the file are detected, a warning will be shown. If it's something simple, like a missing .sym65 or extension script file, you'll be notified. If it's something more complicated, e.g. the project has a comment on an offset that doesn't exist, you will be warned that the problematic data has been deleted, and will be lost if the project is saved. You will also be given the opportunity to cancel the loading of the project.

The locations of the last few projects you've worked with are saved in the application settings. You can access them from File > Recent Projects. If no project is open, links to the two most-recently-opened projects will be available.

Working With a Project

The main project window is divided into five areas:

  1. Center: the code list. If no project is open, this will instead have clickable links to open a new or existing project.
  2. Top left: cross-reference list.
  3. Bottom left: notes list.
  4. Top right: symbols list.
  5. Bottom right: info on selected line.

Most of the action takes place in the center code list.

Code List

The code list provides a view of the code being disassembled. Each line may be an instruction, data item, long comment, note, or assembler directive.

The list is divided into columns:

Double-clicking anywhere on a line with a note or long comment will open the Edit Note or Edit Long Comment dialog, respectively.

The code list is a standard Windows list view. You can left-click to select an item, ctrl-left-click to toggle individual items on and off, and shift-left-click to select a range. You can select all lines with Edit > Select All. Resize columns by left-clicking on the divider in the header and dragging it.

Multi-line items, such as long comments or ASCII strings, are selected as a whole when any part is selected.

Right-clicking opens a menu. The contents are the same as those in the Actions menu item in the menu bar. The set of options that are enabled will depend on what you have selected in the main window.

Undo & Redo

You can undo a change with Edit > Undo, or Ctrl+Z. You can redo a change with Edit > Redo, Ctrl+Y, or Ctrl+Shift+Z.

All changes to the project, including changes to the project properties, are added to the undo/redo buffer. This has no fixed size limit, so no matter how much you change, you can always undo back to the point where the project was opened.

The undo history is not saved as part of the project. Closing a project clears the buffer.

References Window

When a single instruction or data line is selected in the main window, all references to that offset will be shown in the References window. For each reference, the file offset, address, and some details about the type of reference will be shown.

The reference type indicates whether the origin is an instruction or data operand, and provides an indication of the nature of the reference:

In addition, the source will be identified as a symbolic ("Sym") or numeric ("Num") reference. Most will be symbolic, because SourceGen generates symbols automatically. However, references to addresses that are offset from a symbol will also create a numeric reference entry. For example, "LDA addr+1" will create a symbolic reference at <addr> (shown in the table with an adjustment of "+1") and a numeric reference at <addr+1>.

Double-clicking on a reference moves the code list selection to that reference, and adds the previous selection to the navigation stack.

Notes Window

When you add a note, it will also be added to this window. Double-clicking on a note will jump directly to it, and add the previous selection to the navigation stack. This makes notes useful as bookmarks.

Symbols Window

All known symbols are shown here. The filter buttons allow you to screen out symbols you're not interested in, such as platform symbols or constants.

Clicking on one of the column headers will sort the list on that field. Click a second time to reverse the sort direction.

Double-clicking on an auto or user label will jump to that label, and add the previous selection to the navigation stack. This can be a handy way to move around the file, jumping from label to label.

Info Window

Some additional information about the currently-selected line is shown, such as the formatting applied to the operand. If the operand has a default format, any automatically-generated format will be noted. For an instruction, a summary is shown that includes the cycle count, flags affected, and a brief description of what the instruction does. The latter can be especially handy for undocumented instructions.

Navigation

The simplest way to move through the code list is with the scroll wheel on your mouse, or by left-clicking and dragging the scroll bar. You can also use PgUp/PgDn and the arrow keys.

Use Edit > Find to search for text. This performs a case-insensitive text search on the label, opcode, operand, and comment fields. Use Edit > Find Next to find the next match.

Use Edit > Go To to jump to an offset, address, or label. Remember that offsets and addresses are always hexadecimal, and offsets start with a '+'. If you have a label that is also a valid hexadecimal address, like "FEED", the label takes precedence. To jump to the address write "$FEED" instead.

When you jump around, by double-clicking on an opcode or an entry in one of the side windows, the currently-selected line is added to a navigation stack. You can use the arrows on the toolbar to navigate forward or backward. (You can use Alt+Left/Right Arrow, or Ctrl+- / Ctrl+Shift+-, as keyboard shortcuts.)

Adding and Removing Hints

To add code entry or data hints, select the desired offsets and use Actions > Hint As Code Entry Point or Hint As Data. Because code hints mean "the code analyzer should start here", and data hints mean "the code analyzer should stop here", there is rarely any reason to hint multiple consecutive bytes. For this reason, only the first byte on each selected line will be hinted.

For inline data, you need to hint every byte, so every byte in every selected line is hinted when you select Hint As Inline Data. Similarly, the Remove Hints menu item will remove hints from every byte.

If you're having a hard time selecting just the right bytes because the instructions are caught up in a multi-byte data item, such as an auto-detected ASCII string, you can disable uncategorized data analysis (the thing that creates the .STR and .FILL ops for you). You can do this from the project properties editor, or simply by hitting Ctrl+D. Hit that, apply the hint, then hit it again to re-enable the string & fill analyzer.

Another approach is to can use the "Toggle Single-Byte Format" menu item to "flatten" the item.

Format Split-Address Table

Tables of addresses are fairly common. Sometimes you'll find them as a series of 16-bit words, like this:

jmptab   .dd2    func1
         .dd2    func2
         .dd2    func3

While that's fairly common in 16-bit software, 8-bit software often splits the high and low bytes into separate arrays, like this:

jmptabl  .dd1    <func1
         .dd1    <func2
         .dd1    <func3
jmptabh  .dd1    >func1
         .dd1    >func2
         .dd1    >func3

Sometimes the tables contain address - 1, because the values are to be pushed onto the stack for an RTS call.

The split-address table formatter helps you associate symbols with the addresses in the table. To use it, start by selecting the entire table. In the example above, you would select all 6 bytes. The number of bytes in each part must be equal: here, it's 3 low bytes, followed by 3 high bytes. If the number of bytes selected can't be evenly divided by the number of parts, the formatter will report an error.

With the data selected, open the format dialog with Actions > Format Split-Address Table. The rather complicated dialog is split into sections.

For a 16-bit address, you have three choices: low byte first, high byte first, or low byte only with a constant high byte. For a 24-bit address the set of possibilities expands, but is essentially the same: pick the order in which things appear, using fixed constants if desired.

A message at the top of the screen shows how many bytes are selected. It also tells you how many groups there are, but unlike the data operand formatter, the split-address table formatter doesn't care about group boundaries. For this reason, tables do not have to be contiguous in memory. The low bytes and high bytes could be on separate 256-byte pages.

It should be mentioned that SourceGen does not record the fact that the data in question is part of a table. The formatting, labels, and code hints are applied as if you entered them all individually by hand. The formatter is just significantly more convenient. It also does everything as a single undoable action, so if it comes out looking wrong, just hit "undo".

Toggle Single-Byte Format

The "Toggle Single-Byte Format" feature provides a quick way to change a range of bytes to single bytes or back to their default format. It's equivalent to opening the Edit Data Format dialog and selecting "Single bytes" displayed as hex, or selecting "Default".

This can be handy if the default format for a range of bytes is a string, but you want to see it as bytes or set a label in the middle.

Format As Word

This is a quick way to format pairs of bytes as 16-bit words. It's equivalent to opening the Edit Data Format dialog and selecting "16-bit words, little-endian", displayed as hex.

To avoid some confusing situations, it only works on sets of single-byte values. This means, for example, that you can't select a 10-byte string and have it turn into five 16-bit words. You can select as many bytes as you want, but they must come in pairs. (Remember that you can turn off auto-generation of strings and .FILLs with Toggle Data Scan.)

As a special case, if you select a single byte, the following byte will also be selected. This won't work if the following byte is part of a multi-byte data item, is the start of a new region (see Edit Data Format for a definition of what splits a region), or is the last byte in the file.

Toggle Data Scan

This menu item is in the Edit menu, and acts as a shortcut to opening the Project Properties editor, and clicking on the "Analyze Uncategorized Data" checkbox. When enabled, SourceGen will look for ASCII strings and regions of identical bytes, and generate .STR and .FILL directives. When disabled, uncategorized data is presented as one byte per line, which can be handy if you're trying to get at a byte in the middle of a string.

As with all other project property changes, this is an undoable action.

Copying to Clipboard

When you use Edit > Copy, all lines selected in the code list are copied to the system clipboard. This can be a convenient way to post code snippets into forum postings or documentation. The text is copied from the data shown on screen, so your chosen capitalization and pseudo-ops will appear in the copy.

Long comments are included, but notes are not.

By default, the label, opcode, operand, and comment fields are included. From the app settings dialog you can select a different format, "Disassembly", which also includes the address and byte columns.

A copy of all of the fields is also written to the clipboard in CSV format. If you have a spreadsheet like Excel, you can use Paste Special to put the data into individual cells.