mirror of https://github.com/anarkavre/pom1.git
73 lines
1.4 KiB
C
73 lines
1.4 KiB
C
// Pom1 Apple 1 Emulator
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// Copyright (C) 2000 Verhille Arnaud
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// Copyright (C) 2012 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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static unsigned char _dspCr = 0, _dsp = 0, _kbdCr = 0, _kbd = 0x80;
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void resetPia6820(void)
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{
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_kbdCr = _dspCr = _dsp = 0;
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_kbd = 0x80;
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}
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void writeDspCr(unsigned char dspCr)
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{
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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 (!(_dspCr & 0x04))
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return;
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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 (!_kbdCr)
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kbdCr = 0x27;
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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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return _kbdCr;
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}
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unsigned char readKbd(void)
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{
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_kbdCr = 0x27;
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return _kbd;
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}
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