git.sur5r.net Git - cc65/blob - include/plus4.h

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                  plus4.h                                  */
   4 /*                                                                           */
   5 /*                    Plus/4 system specific definitions                     */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 1998-2006, Ullrich von Bassewitz                                      */
  10 /*                Römerstrasse 52                                            */
  11 /*                D-70794 Filderstadt                                        */
  12 /* EMail:         uz@cc65.org                                                */
  13 /*                                                                           */
  14 /*                                                                           */
  15 /* This software is provided 'as-is', without any expressed or implied       */
  16 /* warranty.  In no event will the authors be held liable for any damages    */
  17 /* arising from the use of this software.                                    */
  18 /*                                                                           */
  19 /* Permission is granted to anyone to use this software for any purpose,     */
  20 /* including commercial applications, and to alter it and redistribute it    */
  21 /* freely, subject to the following restrictions:                            */
  22 /*                                                                           */
  23 /* 1. The origin of this software must not be misrepresented; you must not   */
  24 /*    claim that you wrote the original software. If you use this software   */
  25 /*    in a product, an acknowledgment in the product documentation would be  */
  26 /*    appreciated but is not required.                                       */
  27 /* 2. Altered source versions must be plainly marked as such, and must not   */
  28 /*    be misrepresented as being the original software.                      */
  29 /* 3. This notice may not be removed or altered from any source              */
  30 /*    distribution.                                                          */
  31 /*                                                                           */
  32 /*****************************************************************************/
  33
  34
  35
  36 #ifndef _PLUS4_H
  37 #define _PLUS4_H
  38
  39
  40
  41 /* Check for errors */
  42 #if !defined(__PLUS4__)
  43 #  error This module may only be used when compiling for the Plus/4!
  44 #endif
  45
  46
  47
  48 /* Include the base header file for the 264 series. include file.
  49  */
  50 #include <cbm264.h>
  51
  52 /* Define hardware */
  53 #include <_6551.h>
  54 #define ACIA    (*(struct __6551*)0xFD00)
  55
  56
  57
  58 /* The addresses of the static drivers */
  59 extern void plus4_stdjoy_joy[];   /* Referred to by joy_static_stddrv[] */
  60 extern void plus4_stdser_ser[];
  61
  62 void fast (void);
  63 /* Switch the CPU into double clock mode. */
  64
  65 void slow (void);
  66 /* Switch the CPU into single clock mode. */
  67
  68 unsigned char isfast (void);
  69 /* Returns 1 if the CPU is in double clock mode. */
  70
  71
  72 /* End of plus4.h */
  73 #endif