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SCREEN

     Purpose:  Return screen format
Call address:  $FFED (hex)  65517 (decimal)
Communication registers:  X, Y
Preparatory routines:  None
Stack requirements:  2
Registers affected:  X, Y

Description:

This routine returns the format of the screen, e.g., 40 columns in X and 25 lines in Y. The routine can be used to determine what machine a program is running on. This function has been implemented on the Commodore 64 to help upward compatibility of your programs.

How to Use:

  1. Call this routine.

EXAMPLE:

     JSR SCREEN
     STX MAXCOL
     STY MAXROW
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