This is a utility for Casio MC21 user to enjoy after change the shell to others, such as SQ for Pocket PostPet etc.
for Casio MC21 only.
Features

• Full Alphabetic keys.
• Arrow key, Tab & Enter key let you more easily for editing.
• Numeric & symbol keys are limited provided.
• Modify the Hardware key of MC21 on left hand side of the screen, let the hardware Arrow keys perform the actual arrow keys.  By default the hardware arrow keys are page up & down, Home & End.

  use [Display] key for toggle show/hide the floating keyboard.

Screen Shot

This is freeware, but I am not response to any installation questions.

for Casio MC21 only.