/*****************************************************************************/ /* */ /* _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 */ /* */ /* */ /* 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