Re: VGA for Carte Blanche operational

["Bill Buckels" <bbuckels@mts.net>]

<alex.freed.007@gmail.com> wrote:

>However we can use a trick: watch the bus till a read of $C000 returns "1" 
>in the high bit. That's a keyboard press.

Yes and here is a standard piece of code I have used since the '80's in my C 
programs for the Apple II with applicable additions for mouse etc.

getch()
{
  char *KEYPRESS = (char*)0xC000;           /* return the last key press  */
  char *KEYCLEAR = (char*)0xC010;           /* clear the last key press   */
  char c;
            /* clear stragglers from the keyboard buffer */
            while((c=KEYPRESS[0]) > 127)KEYCLEAR[0]=0;

            /* read the keyboard buffer    */
            /* and return the character    */
            do{
               c = KEYPRESS[0];
               }while(c < 128);

               c-=128;
               KEYCLEAR[0]=0;
               return (int )c;
}


>Unfortunately Apple will also see it. So if a program says: "insert disk 2 
>and press
any key" we won't be able to use this mechanism.

Not a practical option from my point of view...

Bill