Add a goto indirect jump from pointer

[cc65] / include / _pia.h

diff --git a/include/_pia.h b/include/_pia.h
index d102e8ac447abffe49514a42c5f8eab6658a2e3a..4b71ecfd4a02f1d3c7294bb64d6e7a68cfbf6c1c 100644 (file)
--- a/include/_pia.h
+++ b/include/_pia.h
@@ -1,18 +1,44 @@
-/*
- * _pia.h
- *
- * Freddy Offenga, 4/9/2000
- *
- * Internal include file, do not use directly.
- *
- */
+/*****************************************************************************/
+/*                                                                           */
+/*                                  _pia.h                                   */
+/*                                                                           */
+/*                Internal include file, do not use directly                 */
+/*                                                                           */
+/* The Peripheral Interface Adapter (PIA) chip (a 6520 or 6820) provides     */
+/* parallel I/O interfacing; it was used in Atari 400/800 and Commodore PET  */
+/* family of computers, for joystick and some interrupts.                    */
+/* Sources; various + Wikpedia article on "Peripheral Interface Adapter".    */
+/*                                                                           */
+/*                                                                           */
+/* (C) 2000 Freddy Offenga <taf_offenga@yahoo.com>                           */
+/*                                                                           */
+/*                                                                           */
+/* This software is provided 'as-is', without any expressed or implied       */
+/* warranty.  In no event will the authors be held liable for any damages    */
+/* arising from the use of this software.                                    */
+/*                                                                           */
+/* Permission is granted to anyone to use this software for any purpose,     */
+/* including commercial applications, and to alter it and redistribute it    */
+/* freely, subject to the following restrictions:                            */
+/*                                                                           */
+/* 1. The origin of this software must not be misrepresented; you must not   */
+/*    claim that you wrote the original software. If you use this software   */
+/*    in a product, an acknowledgment in the product documentation would be  */
+/*    appreciated but is not required.                                       */
+/* 2. Altered source versions must be plainly marked as such, and must not   */
+/*    be misrepresented as being the original software.                      */
+/* 3. This notice may not be removed or altered from any source              */
+/*    distribution.                                                          */
+/*                                                                           */
+/*****************************************************************************/
+
 
 
 #ifndef __PIA_H
 #define __PIA_H
 
 
-/* Define a structure with the pia register offsets */
+/* Define a structure with the PIA register offsets */
 struct __pia {
     unsigned char   porta;  /* port A data r/w */
     unsigned char   portb;  /* port B data r/w */
@@ -20,6 +46,7 @@ struct __pia {
     unsigned char   pbctl;  /* port B control */
 };
 
+/* (Some specific register values for Atari defined in atari.h) */
+
 /* End of _pia.h */
 #endif
-