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LEXIDATA DISPLAY OPERATIONS

Images can be displayed in a grey scale or in colour on the Lexidata display monitor. It is used in association with software commands and the joystick/trackerball and its switches.

The Lexidata joystick has six switches. These are labelled, from left to right, EXIT, MODE, DOWN, RESET, UP and READ. All Lexidata programs that use the switches light up only those which they use and give each switch an interpretation which is in the general spirit of its label. The general meanings are:-

1. EXIT - Exit from the program
2. MODE - Cycle through various options presented by the program
3. DOWN - Decrease some quantity or quantities
4. RESET - Reset some quantity or quantities
5. UP - Increase some quantity or quantities
6. READ - Read the cursor position

Notes

It is always the change in state that operates, never the actual position of the switch.

The following software commands operate the Lexidata display.

1. CLOV(ER) - Clear the Lexidata overlay planes
2. LEXINI(T) - Reset the Lexidata and load an appropriate lookup table
3. LEXCL(EAR) - Clear or reset the Lexidata parameter mask
4. LEXPA(N) - Pan and zoom
5. LEXZOO(M) - Zoom by hand with specified factor about specified position
6. LUTCON(TRAST) - Manipulate the lookup table to enhance contrast
7. LUT(LOAD) - Load a lookup table (try COLS, GREY)
8. LUTROT(ATE) - Rotate the lookup table
9. UNZ(OOM) - Return to an unzoomed and unpanned state
10. LEXPL(OT) - Plot the current CCD image on the lineprinter

• DIS(P) - Display an image
• QDI(PARM)/DIP(ARM) - Enquire and alter display parameters
• PHOT(OM) - Simple statistics and profile utilities
• MOVESTAR - Put an object on to a specified area of the chip
• STARFIT - Fit Gaussian profiles to stellar images