mirror of https://github.com/nobuh/napple1.git
105 lines
1.9 KiB
C
105 lines
1.9 KiB
C
/* napple1 ncurses Apple 1 emulator
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* Copyright (C) 2008 Nobu Hatano
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*
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* Pom1 Apple 1 Emulator
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* Copyright (C) 2000 Verhille Arnaud
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* Copyright (C) 2006 John D. Corrado
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "pia6820.h"
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#include "screen.h"
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static unsigned char _dspCr = 0, _dsp = 0, _kbdCr = 0, _kbd = 0;
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static int kbdInterrups = 0, dspOutput = 0;
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void resetPia6820(void)
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{
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kbdInterrups = dspOutput = 0;
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_kbdCr = _dspCr = 0;
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}
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void setKdbInterrups(int b)
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{
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kbdInterrups = b;
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}
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int getKbdInterrups(void)
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{
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return kbdInterrups;
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}
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int getDspOutput(void)
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{
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return dspOutput;
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}
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void writeDspCr(unsigned char dspCr)
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{
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if (!dspOutput && dspCr >= 0x80)
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dspOutput = 1;
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else
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_dspCr = dspCr;
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}
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void writeDsp(unsigned char dsp)
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{
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if (dsp >= 0x80)
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dsp -= 0x80;
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outputDsp(dsp);
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_dsp = dsp;
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}
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void writeKbdCr(unsigned char kbdCr)
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{
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if (!kbdInterrups && kbdCr >= 0x80)
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kbdInterrups = 1;
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else
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_kbdCr = kbdCr;
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}
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void writeKbd(unsigned char kbd)
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{
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_kbd = kbd;
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}
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unsigned char readDspCr(void)
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{
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return _dspCr;
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}
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unsigned char readDsp(void)
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{
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return _dsp;
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}
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unsigned char readKbdCr(void)
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{
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if (kbdInterrups && _kbdCr >= 0x80)
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{
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_kbdCr = 0;
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return 0xA7;
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}
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return _kbdCr;
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}
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unsigned char readKbd(void)
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{
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return _kbd;
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}
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