mirror of
https://github.com/cc65/cc65.git
synced 2024-12-24 11:31:31 +00:00
417ef278a3
PIA is also used in the Commodore PET, and for different purposes (see http://www.6502.org/users/andre/petindex/progmod.html#pia1), so extracted Atari-specific register #defines and placed them in atari.h.
53 lines
3.0 KiB
C
53 lines
3.0 KiB
C
/*****************************************************************************/
|
|
/* */
|
|
/* _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 */
|
|
struct __pia {
|
|
unsigned char porta; /* port A data r/w */
|
|
unsigned char portb; /* port B data r/w */
|
|
unsigned char pactl; /* port A control */
|
|
unsigned char pbctl; /* port B control */
|
|
};
|
|
|
|
/* (Some specific register values for Atari defined in atari.h) */
|
|
|
|
/* End of _pia.h */
|
|
#endif
|