# Keyboard Controls

For faster operation of the Curta you can use single or multiple key commands.

Some more advanced options are only available as keyboard commands.

Notes:

- There is a timeout between the first and second key of a multi-key command:
  If you are too slow the command is ignored.
- You can use lower case, upper case or a mix: YACS is not case sensitive

key(s) | action | remarks
--- | --- | ---
| MR | Machine Ready | Clear and Reset the Curta
Enter | Start a Crank Cycle | At same speed as previous crank cycle
C1 | Crank very fast |
C2 | Crank fast |
C3 | Crank slow |
C4 | Crank very slow |
1..6 | Turn Carriage | 1 = units, 2 = tens...
A | Add Mode |
S | Subtract Mode |
TI | Turns Counter Increment Mode | Cranking once (in add mode) increments the turns counter
TD | Turns Counter Decrement Mode | Cranking once (in add mode) decrements the turns counter
CX | Clearing Lever eXpand | To expand (fold out) the clearing lever
CF | Clearing Lever Fold | To Fold-In the clearing lever
CR | Clear Results | Only possible if clearing lever extended
CT | Clear Turns Counter | Only possible if clearing lever extended
CS | Clear Setters | Clears the settings on the setting levers
EX | Start Exploded view mode |
IM | Implode the Curta |
X1 | Strip the Curta | Show only the essential parts
X0 | Restore the Curta | Show all parts
BS | Background Color Setters: Show |
BH | Background Color Setters: Hide |
OS | Outside Show | Cover is always visible
OH | Outside Hide | Cover is never visible
OA | Outside Automatic | Cover to automatic mode: Show/Hide depends on distance
FT | Fog Toggle | Toggle the Fog On/Off
FI | Fog Increase | More Fog - (only possible is Fog is On)
FD | Fog Decrease | Less Fog - (only possible is Fog is On)
FL | Fog Linear | Linear increase in blending: for depth cueing effect (only possible is Fog is On)
FE | Fog Exponential | Exponential increase in blending: for more natural fog (only possible is Fog is On) Note: Only available if the VRML viewer is using Open GL