2009-05-02 23:03:37 +02:00
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/*
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* Copyright (C) 2002 The DOSBox Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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 Library 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "dosbox.h"
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#include "inout.h"
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#include "timer.h"
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#include "vga.h"
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static Bit8u flip=0;
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static Bit32u keep_vretrace;
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static bool keeping=false;
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static Bit8u p3c2data;
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static Bit8u read_p3da(Bit32u port) {
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vga.internal.attrindex=false;
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if (vga.config.retrace) {
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vga.config.retrace=false;
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vga.config.real_start=vga.config.display_start;
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keep_vretrace=LastTicks+1;
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keeping=true;
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flip=0;
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return 9;
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}
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if (keeping) {
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if (LastTicks>(keep_vretrace)) keeping=false;
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return 9;
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} else {
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flip++;
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if (flip>10) flip=0;
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if (flip>5) return 1;
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return 0;
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}
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};
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static void write_p3d8(Bit32u port,Bit8u val) {
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return;
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}
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static void write_p3c2(Bit32u port,Bit8u val) {
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p3c2data=val;
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}
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static Bit8u read_p3c2(Bit32u port) {
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return p3c2data;
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}
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void VGA_SetupMisc(void) {
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IO_RegisterReadHandler(0x3da,read_p3da,"VGA Input Status 1");
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// IO_RegisterWriteHandler(0x3d8,write_p3d8,"VGA Mode Control");
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IO_RegisterWriteHandler(0x3c2,write_p3c2,"VGA Misc Output");
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IO_RegisterReadHandler(0x3c2,read_p3c2,"VGA Misc Output");
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}
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