Minor tweaks

- Allow user to "unnecessarily" set an address override.  This is
  a handy thing to do when dealing with code that does a lot of
  relocations.

- Moved "save needed" text to the end of the title string.

- Updated F8-ROM syms.

- Added ProDOS 8 error code constants

SourceGen/MainController.cs

@@ -632,19 +632,19 @@ namespace SourceGen {
                 } else {
                     sb.Append(Path.GetFileName(mProjectPathName));
                 }
-
-                if (mProject.IsDirty) {
-                    sb.Append(" ");
-                    sb.Append(Res.Strings.TITLE_MODIFIED);
-                }
-
                 if (mProject.IsReadOnly) {
                     sb.Append(" ");
                     sb.Append(Res.Strings.TITLE_READ_ONLY);
                 }
                 sb.Append(" - ");
             }
+
             sb.Append(Res.Strings.TITLE_BASE);
+
+            if (mProject != null && mProject.IsDirty) {
+                sb.Append(" - ");
+                sb.Append(Res.Strings.TITLE_MODIFIED);
+            }
             mMainWin.Title = sb.ToString();
         }
 
@@ -1642,7 +1642,7 @@ namespace SourceGen {
                 // Not allowed.  The AddressMap will just put it back, which confuses
                 // the undo operation.
                 Debug.WriteLine("EditAddress: not allowed to remove address at offset +000000");
-            } else if (attr.Address != dlg.Address) {
+            } else if (true || attr.Address != dlg.Address) {
                 Debug.WriteLine("EditAddress: changing addr at offset +" + offset.ToString("x6") +
                     " to " + dlg.Address);
 
@@ -2954,7 +2954,7 @@ namespace SourceGen {
         }
 
         /// <summary>
-        /// Handles the four Actions - edit hint commands.
+        /// Handles the four Actions &gt; edit hint commands.
         /// </summary>
         /// <param name="hint">Type of hint to apply.</param>
         /// <param name="firstByteOnly">If set, only the first byte on each line is hinted.</param>

SourceGen/RuntimeData/Apple/F8-ROM.sym65

@@ -30,6 +30,12 @@ MON_A1L         @ $3C       ;general purpose
 MON_A1H         @ $3D       ;general purpose
 MON_A2L         @ $3E       ;general purpose
 MON_A2H         @ $3F       ;general purpose
+MON_A3L         @ $40       ;general purpose
+MON_A3H         @ $41       ;general purpose
+MON_A4L         @ $42       ;general purpose
+MON_A4H         @ $43       ;general purpose
+MON_A5L         @ $44       ;general purpose
+MON_A5H         @ $45       ;general purpose
 MON_RNDL        @ $4E       ;low byte of KEYIN "random" value
 MON_RNDH        @ $4F       ;high byte of KEYIN "random" value
 
@@ -105,8 +111,8 @@ MON_SCROLL      @ $FC70     ;scroll up one line
 MON_CLREOL      @ $FC9C     ;clear to end of line
 MON_CLREOLZ     @ $FC9E
 MON_WAIT        @ $FCA8     ;delay for (26 + 27*Acc + 5*(Acc*Acc))/2 cycles
-MON_NXTA4       @ $FCB4     ;increment A4
-MON_NXTA1       @ $FCBA     ;increment A1
+MON_NXTA4       @ $FCB4     ;increment A4, fall through into NXTA1
+MON_NXTA1       @ $FCBA     ;increment A1; set carry if A1 >= A2 before inc
 MON_HEADR       @ $FCC9     ;write cassette sync
 MON_WRTAPE      @ $FCE5     ;casssette write
 MON_RD2BIT      @ $FCFA     ;cassette read
@@ -128,7 +134,7 @@ MON_COUT        @ $FDED     ;print Acc to output device
 MON_COUT1       @ $FDF0
 MON_COUTZ       @ $FDF6
 MON_IDROUTINE   @ $FE1F
-MON_MOVE        @ $FE2C     ;memory move A1/A2 to A4
+MON_MOVE        @ $FE2C     ;move bytes from A1 to A4 until A1=A2
 MON_LIST        @ $FE5E     ;disassemble 20 instructions (not on GS)
 MON_SETINV      @ $FE80     ;set video mode to inverse
 MON_SETNORM     @ $FE84     ;set video mode to normal

SourceGen/RuntimeData/Apple/ProDOS8.sym65

@@ -44,6 +44,40 @@ P8_GET_BUF      = $D3
 
 *TAG
 
+;
+; ProDOS 8 MLI function return codes.
+;
+P8E_NO_ERR          = $00       ;No error (call succeeded)
+P8E_BAD_SC_NUM      = $01       ;Bad system call number
+P8E_BAD_SC_PCOUNT   = $04       ;Bad system call parameter count
+P8E_INT_TBL_FULL    = $25       ;Interrupt table full
+P8E_IO_ERR          = $27       ;I/O error
+P8E_NO_DEV_CONN     = $28       ;No device connected
+P8E_WRITE_PROT      = $2B       ;Disk write protected
+P8E_VOL_SWITCHED    = $2E       ;Volume switched
+P8E_INVALID_PATH    = $40       ;Invalid pathname syntax
+P8E_MAX_FILES_OPEN  = $42       ;Too many files open
+P8E_INVALID_REFNUM  = $43       ;Invalid reference number
+P8E_DIR_NOT_FOUND   = $44       ;Directory not found
+P8E_VOL_NOT_FOUND   = $45       ;Volume not found
+P8E_FILE_NOT_FOUND  = $46       ;File not found
+P8E_DUP_FILENAME    = $47       ;Duplicate filename
+P8E_VOL_FULL        = $48       ;Volume full
+P8E_VOL_DIR_FULL    = $49       ;Volume directory full
+P8E_INCOMPAT_FORMAT = $4A       ;Incompatible file format / ProDOS version
+P8E_UNSUP_STORAGE   = $4B       ;Unsupported storage_type
+P8E_EOF             = $4C       ;End of file encountered
+P8E_INVALID_POSN    = $4D       ;Position out of range
+P8E_INVALID_ACCESS  = $4E       ;File access error
+P8E_FILE_OPEN       = $50       ;File is open
+P8E_DIR_DAMAGED     = $51       ;Directory structure damaged
+P8E_NOT_PRODOS      = $52       ;Not a ProDOS volume
+P8E_INVALID_PARAM   = $53       ;Invalid system call parameter
+P8E_VCB_FULL        = $55       ;Volume Control Block table full
+P8E_BAD_BUFFER      = $56       ;Bad buffer address
+P8E_DUP_VOLUME      = $57       ;Duplicate volume
+P8E_FILE_DAMAGED    = $5A       ;File structure damaged (bad volume bitmap?)
+
 
 ;
 ; System global page.  Labels and comments are from the ProDOS 8