John's Vademecum

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====== DM41X Ladybug Module ======

** Another HP16 emulation **

===== Section One =====

{{:public:calculator:guides:ladybug_overlay.png?300}}
===== Section Two =====

Ladybug more user friendly, if less versatile, HP16 module than the fully-featured HP16 module by Angel Martin. Both have their uses, but for a simple calculator for bit-banging while writing 6502 assembly code Ladybug does everything, with a less convoluted User Interface.

==== Nice features ====

  * A "CMP" function akin to 6502 - sets flags in the same way but doesn't change the register(s)
  * Status Flags : C, Z, N and V equivalent to 6502 flags and set in the same way after various operations.
    * Flag ''0'' = Zero ''Z''
    * Flag ''1'' = Sign ''N''
    * Flag ''3'' = Carry ''C''
    * Flag ''4'' = Overflow ''V''
  * 2's-complement mode is set with Flag ''2''
  * Leading Zeros display is set with Flag ''5''

  * ''Word Size'' is set with <key>shift+R/S</key>
  * ''Windowing'' is selected with <key>.</key>
  * Bits can be ''set'' <key>shift+4</key>, ''reset'' <key>shift+5</key> and ''tested'' <key>shift+6</key>

  * Boolean Operations on values in X and Y registers
    * ''AND'' <key>shift+1</key>
    * ''OR'' <key>shift+2</key>
    * ''XOR'' <key>shift+3</key>
  
    * ''NOT'' <key>shift+CHS</key> (invert each bit, on the value in the X register)

  * ''Shift'' and ''Rotate'' functions are conveniently accessible - see Overlay picture above - without delving into menus or //launchers//

--- //John Pumford-Green 23/09/22 13:40//

 
===== Further Information =====

  *{{ :public:calculator:guides:ladybug.pdf |}}
  *[[https://github.com/hth313/ladybug/releases]]

{{tag>calculator dm41x}}