Allow shift-USER in alpha mode

Also mention about the changes to the alpha keyboard in the documentation.
hth313 · May 13, 2020 · 51c22b0 · 51c22b0
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diff --git a/doc/keyboard.rst b/doc/keyboard.rst
@@ -14,6 +14,8 @@ number in the selected base.
 .. image:: calculator.png
    :height: 560
 
+The alpha mode keyboard is also slightly modified and hass the
+``ALDI`` function where ``ARCL`` normally is.
 
 .. index:: activation
 
@@ -38,6 +40,9 @@ usual.
 Another way to disable Ladybug is to turn the calculator off and
 unplug the module.
 
+The shifted USER key can also be used in alpha mode to exit integer
+mode.
+
 Secondary functions
 ===================
 

diff --git a/src/ladybug.s b/src/ladybug.s
@@ -381,8 +381,10 @@ alphaKeys:    gosub   keyKeyboard   ; does not return
               .section Code
               .align 4
 alphaKeyTable:
-              .con    58            ; RCL
+              .con    58            ; shifted RCL, where ARCL usually is
               KeyEntry ALDI
+              .con    78            ; shifted USER
+              KeyEntry EXITAPP
               .con    0x100         ; end of table
 
               .section Code