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