Initial snapshot code (in progress)

1 files changed, 39 insertions, 1 deletions

diff --git a/instructions.txt b/instructions.txt
index 99c2b23..3b78efa 100644
--- a/instructions.txt
+++ b/instructions.txt
@@ -70,6 +70,9 @@
     Once the A button has been pressed the ZX81 resets and displays itself
     on the top screen, and a soft keyboard is displayed on the bottom, touch
     sensitive, DS screen.
+
+    Also at this point, if so configured, a default memory snap will be loaded.
+    See the "Memory Snapshots" section for more details.
     
     If you've never used a ZX81 before then you may wish to find out how the
     keyboard works -- it uses a keyword entry system, rather than the straight
@@ -120,6 +123,16 @@
 
             See the second to last section for more details.
 
+        LOAD MEMORY SNAPSHOT
+            Loads a memory snapshot.  This option only works if a FAT-enabled
+            version of DS81 is being used.  See the "Memory Snapshot" section
+            for more details.
+
+        SAVE MEMORY SNAPSHOT
+            Saves a memory snapshot.  This option only works if a FAT-enabled
+            version of DS81 is being used.  See the "Memory Snapshot" section
+            for more details.
+
         CANCEL
             Cancels the menu.
 
@@ -193,7 +206,7 @@
 
     If you know of a game that seems to cause it real trouble, please let me
     know -- the high-resolution support is still a bit of a hack whereby the
-    'emulator searches memory for the display file on detecting that the 'I'
+    emulator searches memory for the display file on detecting that the 'I'
     register has changed.
 
 
@@ -260,6 +273,31 @@
         
         Not that I've found any that work yet :-)
 
+    LOAD DEFAULT MEMORY SNAP
+
+        If enabled DS81 will look for a memory snapshot called AUTO.D81 in 
+        either the root directory or the ZX81SNAP directory.
+        
+        See the "Memory Snapshot" section for more details on snapshots.
+
+
+9. Memory Snapshots
+-------------------
+
+    Since version 1.3 DS81 now supports basic memory snapshots.  When you
+    select the "SAVE MEMORY SNAPSHOT" from the main menu DS81 will prompt
+    for a filename (only up to 8 alphabetical characters).  Once entered
+    the snapshot will be saved in the directory ZX81SNAP with an automatically
+    added .D81 extension.  If this save fails, an attempt is made to save the
+    snapshot in the root directory of the device.
+
+    On selecting to load a memory snapshot a file selector is displayed.  On
+    selecting one of the snapshots it will be instantly loaded.
+
+    Note that along with the machine's state the currently configured keypad
+    mappings are saved in the snapshot and restored when loaded.
+
+
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 $Id$