Minor tweaks

Mark the "info" window as read-only.

When the project closes, clear the contents of the Symbols and
Notes windows.

Clarify some Apple II I/O definitions.

SourceGen/RuntimeData/Apple/Cxxx-IO.sym65

@@ -1,8 +1,9 @@
 ; Copyright 2018 faddenSoft. All Rights Reserved.
 ; See the LICENSE.txt file for distribution terms (Apache 2.0).
 ;
-; Adapted from NiftyList, by Dave Lyons, and Apple II reference materials
+; Sources:
-; found online.
+;   NiftyList, by Dave Lyons
+;   Various Apple II reference materials found online
 
 *SYNOPSIS Symbols from the Cxxx I/O area, common to most Apple II models.
 
@@ -16,32 +17,32 @@ RDMAINRAM       @ $C002     ;W if 80STORE off: read main mem $0200-BFFF
 RDCARDRAM       @ $C003     ;W if 80STORE off: read aux mem $0200-BFFF
 WRMAINRAM       @ $C004     ;W if 80STORE off: write main mem $0200-BFFF
 WRCARDRAM       @ $C005     ;W if 80STORE off: write aux mem $0200-BFFF
-SETSLOTCXROM    @ $C006     ;W peripheral ROM ($C100-CFFF)
+SETSLOTCXROM    @ $C006     ;W use peripheral ROM ($C100-CFFF)
-SETINTCXROM     @ $C007     ;W internal ROM ($C100-CFFF)
+SETINTCXROM     @ $C007     ;W use internal ROM ($C100-CFFF)
-SETSTDZP        @ $C008     ;W main stack and zero page
+SETSTDZP        @ $C008     ;W use main stack and zero page
-SETALTZP        @ $C009     ;W aux stack and zero page
+SETALTZP        @ $C009     ;W use aux stack and zero page
-SETINTC3ROM     @ $C00A     ;W ROM in slot 3
+SETINTC3ROM     @ $C00A     ;W use internal slot 3 ROM
-SETSLOTC3ROM    @ $C00B     ;W ROM in aux slot
+SETSLOTC3ROM    @ $C00B     ;W use external slot 3 ROM
-CLR80VID        @ $C00C     ;W 40 columns
+CLR80VID        @ $C00C     ;W disable 80-column display mode
-SET80VID        @ $C00D     ;W 80 columns
+SET80VID        @ $C00D     ;W enable 80-column display mode
-CLRALTCHAR      @ $C00E     ;W primary char set
+CLRALTCHAR      @ $C00E     ;W use primary char set
-SETALTCHAR      @ $C00F     ;W alternate char set
+SETALTCHAR      @ $C00F     ;W use alternate char set
 KBDSTRB         @ $C010     ;RW keyboard strobe
-RDLCBNK2        @ $C011     ;R status of selected $Dx bank
+RDLCBNK2        @ $C011     ;R bit 7: reading from LC bank 2 ($Dx)?
-RDLCRAM         @ $C012     ;R status of $Dx ROM / $Dx RAM
+RDLCRAM         @ $C012     ;R bit 7: reading from LC RAM?
-RDRAMRD         @ $C013     ;R status of main/aux RAM reading
+RDRAMRD         @ $C013     ;R bit 7: reading from aux/alt 48K?
-RDRAMWRT        @ $C014     ;R status of main/aux RAM writing
+RDRAMWRT        @ $C014     ;R bit 7: writing to aux/alt 48K?
-RDCXROM         @ $C015     ;R status of periph/ROM access
+RDCXROM         @ $C015     ;R bit 7: using internal slot ROM?
-RDALTZP         @ $C016     ;R status of main/aux stack and zero page
+RDALTZP         @ $C016     ;R bit 7: using alt zero page, stack, & LC?
-RDC3ROM         @ $C017     ;R status of slot 3 / aux slot ROM
+RDC3ROM         @ $C017     ;R bit 7: using external (slot 3) ROM?
-RD80COL         @ $C018     ;R status of $C002-C005/PAGE2 for aux mem
+RD80COL         @ $C018     ;R bit 7: 80STORE is on?
-RDVBLBAR        @ $C019     ;R vertical blanking state
+RDVBLBAR        @ $C019     ;R bit 7: not VBL (VBL signal is low)?
-RDTEXT          @ $C01A     ;R status of text/graphics
+RDTEXT          @ $C01A     ;R bit 7: using text mode?
-RDMIX           @ $C01B     ;R status of full screen / mixed graphics
+RDMIX           @ $C01B     ;R bit 7: using mixed mode?
-RDPAGE2         @ $C01C     ;R status of page 1 / page 2
+RDPAGE2         @ $C01C     ;R bit 7: using page 2?
-RDHIRES         @ $C01D     ;R status of lo-res / hi-res
+RDHIRES         @ $C01D     ;R bit 7: using hi-res graphics?
-ALTCHARSET      @ $C01E     ;R status of primary / alternate char set
+ALTCHARSET      @ $C01E     ;R bit 7: using alt char set?
-RD80VID         @ $C01F     ;R status of 40/80 columns
+RD80VID         @ $C01F     ;R bit 7: using 80 columns?
 TAPEOUT         @ $C020     ;RW toggle caseette tape output
 MONOCOLOR       @ $C021     ;W color/mono
 TBCOLOR         @ $C022     ;RW screen color (low is BG, high is FG)
@@ -99,7 +100,9 @@ CLRAN1          @ $C05B     ;RW annunciator 1 on
 SETAN2          @ $C05C     ;RW annunciator 2 off
 CLRAN2          @ $C05D     ;RW annunciator 2 on
 SETAN3          @ $C05E     ;RW annunciator 3 off
+SETDHIRES       = $C05E     ;W if IOUDIS set, turn on double hi-res
 CLRAN3          @ $C05F     ;RW annunciator 3 on
+CLRDHIRES       = $C05F     ;W if IOUDIS set, turn off double hi-res
 TAPEIN          @ $C060     ;R read cassette input
 BUTN3           = $C060     ;R switch input 3
 BUTN0           @ $C061     ;R switch input 0 / open-apple
@@ -116,16 +119,23 @@ CLTRM           @ $C06E     ;clear test mode
 ENTM            @ $C06F     ;enable test mode
 PTRIG           @ $C070     ;RW analog input reset
 
-;                 $C080     ;RW read RAM, write off, bank 2
+RDIOUDIS        < $C07E     ;R status of IOU disabling
-ROMIN           @ $C081     ;RW read ROM, write on, bank 2
+SETIOUDIS       > $C07E     ;W disable IOU
-ROMIN_RO        @ $C082     ;RW read ROM, write off, bank 2
+RDDHIRES        < $C07F     ;R status of double hi-res
-LCBANK2         @ $C083     ;RW read RAM, write on, bank 2
+CLRIOUDIS       > $C07F     ;W enable IOU
-;                 $C088     ;RW read RAM, write off, bank 1
-;                 $C089     ;RW read ROM, write on, bank 1
-;                 $C08A     ;RW read ROM, write off, bank 1
-LCBANK1         @ $C08B     ;RW read RAM, write on, bank 1
 
-CLRROM          @ $CFFF
+;                 $C080     ;RW read RAM bank 2, write off
+ROMIN           @ $C081     ;RWx2 read ROM, write RAM bank 2
+ROMIN_RO        @ $C082     ;RW read ROM, no write
+LCBANK2         @ $C083     ;RWx2 read/write RAM bank 2
+; C084-C087 repeats
+;                 $C088     ;RW read RAM bank 1, write off
+;                 $C089     ;RW read ROM, write RAM bank 1
+;                 $C08A     ;RW read ROM, no write
+LCBANK1         @ $C08B     ;RWx2 read/write RAM bank 1
+; C08C-C08F repeats
+
+CLRROM          @ $CFFF     ;disable slot C8 ROM
 
 ;IWM:PH0 off @ C0E0
 ;IWM:PH0 on @ C0E1

SourceGen/RuntimeData/Help/intro.html

@@ -150,8 +150,8 @@ disassembly of the instruction stream will come out wrong.</p>
 Accessing the address can have side effects, like changing between text
 and graphics modes.  Sometimes reading and writing have different effects.
 For example, on later models of the Apple II, reading from
-$C000 returns the most recently hit key, while writing to $C000 disables
+$C000 returns the most recently hit key, while writing to $C000 changes
-80 columns.</p>
+how 80-column display memory is mapped.</p>
 <p>On a few systems, such as the Atari 2600, RAM, ROM, and registers can
 appear at multiple locations, "mirrored" across the address space.</p>
 

SourceGen/WpfGui/MainWindow.xaml

@@ -721,7 +721,7 @@ limitations under the License.
                 </GroupBox>
 
                 <GroupBox Grid.Row="2" Header="Info">
-                    <TextBox Text="{Binding InfoPanelContents}"
+                    <TextBox Text="{Binding InfoPanelContents}" IsReadOnly="True"
                              FontFamily="{StaticResource GeneralMonoFont}"
                              TextWrapping="Wrap"/>
                 </GroupBox>

SourceGen/WpfGui/MainWindow.xaml.cs

@@ -352,6 +352,10 @@ namespace SourceGen.WpfGui {
             // Clear this to release the memory.
             CodeDisplayList.Clear();
 
+            // Clear these so we're not still showing them after the project closes.
+            SymbolsList.Clear();
+            NotesList.Clear();
+
             InfoPanelContents = string.Empty;
 
             // If you open a new project while one is already open, the ListView apparently