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vga_other.cpp

/*
 *  Copyright (C) 2002-2004  The DOSBox Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <string.h>
#include "dosbox.h"
#include "inout.h"
#include "vga.h"

static void write_crtc_index_other(Bitu port,Bitu val,Bitu iolen) {
      vga.other.index=val;
}

static Bitu read_crtc_index_other(Bitu port,Bitu iolen) {
      return vga.other.index;
}

static void write_crtc_data_other(Bitu port,Bitu val,Bitu iolen) {
      switch (vga.other.index) {
      case 0x00:        //Horizontal total
            if (vga.other.htotal ^ val) VGA_StartResize();
            vga.other.htotal=val;
            break;
      case 0x01:        //Horizontal displayed chars
            if (vga.other.hdend ^ val) VGA_StartResize();
            vga.other.hdend=val;
            break;
      case 0x02:        //Horizontal sync position
            vga.other.hsyncp=val;
            break;
      case 0x03:        //Horizontal sync width
            vga.other.hsyncw=val;
            break;
      case 0x04:        //Vertical total
            if (vga.other.vtotal ^ val) VGA_StartResize();
            vga.other.vtotal=val;
            break;
      case 0x05:        //Vertical display adjust
            if (vga.other.vadjust ^ val) VGA_StartResize();
            vga.other.vadjust=val;
            break;
      case 0x06:        //Vertical rows
            if (vga.other.vdend ^ val) VGA_StartResize();
            vga.other.vdend=val;
            break;
      case 0x07:        //Vertical sync position
            vga.other.vsyncp=val;
            break;
      case 0x09:        //Max scanline
            if (vga.other.max_scanline ^ val) VGA_StartResize();
            vga.other.max_scanline=val;
            break;
      case 0x0A:  /* Cursor Start Register */
            vga.draw.cursor.sline = val&0x1f;
            vga.draw.cursor.enabled = ((val & 0x60) != 0x20);
            break;
      case 0x0B:  /* Cursor End Register */
            vga.draw.cursor.eline = val&0x1f;
            break;
      case 0x0C:  /* Start Address High Register */
            vga.config.display_start=(vga.config.display_start & 0x00FF) | (val << 8);
            break;
      case 0x0D:  /* Start Address Low Register */
            vga.config.display_start=(vga.config.display_start & 0xFF00) | val;
            break;
      case 0x0E:  /*Cursor Location High Register */
            vga.config.cursor_start&=0x00ff;
            vga.config.cursor_start|=val << 8;
            break;
      case 0x0F:  /* Cursor Location Low Register */
            vga.config.cursor_start&=0xff00;
            vga.config.cursor_start|=val;
            break;
      default:
            LOG(LOG_VGAMISC,LOG_NORMAL)("MC6845:Write %X to illegal index %x",val,vga.other.index);
      }
}
static Bitu read_crtc_data_other(Bitu port,Bitu iolen) {
      switch (vga.other.index) {
      case 0x00:        //Horizontal total
            return vga.other.htotal;
      case 0x01:        //Horizontal displayed chars
            return vga.other.hdend;
      case 0x02:        //Horizontal sync position
            return vga.other.hsyncp;
      case 0x03:        //Horizontal sync width
            return vga.other.hsyncw;
      case 0x04:        //Vertical total
            return vga.other.vtotal;
      case 0x05:        //Vertical display adjust
            return vga.other.vadjust;
      case 0x06:        //Vertical rows
            return vga.other.vdend;
      case 0x07:        //Vertical sync position
            return vga.other.vsyncp;
      case 0x09:        //Max scanline
            return vga.other.max_scanline;
      case 0x0C:  /* Start Address High Register */
            return vga.config.display_start >> 8;
      case 0x0D:  /* Start Address Low Register */
            return vga.config.display_start;
      case 0x0E:  /*Cursor Location High Register */
            return vga.config.cursor_start>>8;
      case 0x0F:  /* Cursor Location Low Register */
            return vga.config.cursor_start;
      default:
            LOG(LOG_VGAMISC,LOG_NORMAL)("MC6845:Read from illegal index %x",vga.other.index);
      }
      return (Bitu)-1;
}

static void write_color_select(Bit8u val) {
      vga.tandy.color_select=val;
      switch (vga.mode) {
      case M_TANDY2:
            VGA_SetCGA2Table(0,val & 0xf);
            break;
      case M_TANDY4:
            {
                  if (machine == MCH_TANDY && (vga.tandy.gfx_control & 0x8)) {
                        VGA_SetCGA4Table(0,1,2,3);
                        return;
                  }
                  Bit8u base=(val & 0x10) ? 0x08 : 0;
                  /* Check for BW Mode */
                  if (vga.tandy.mode_control & 0x4) {
                        if (val & 0x20) VGA_SetCGA4Table(val & 0xf,3+base,4+base,7+base);
                        else VGA_SetCGA4Table(val & 0xf,2+base,4+base,6+base);
                  } else {
                        if (val & 0x20) VGA_SetCGA4Table(val & 0xf,3+base,5+base,7+base);
                        else VGA_SetCGA4Table(val & 0xf,2+base,4+base,6+base);
                  }
            }
            break;
      case M_TEXT:
      case M_TANDY16:
            break;
      }
}

static void write_mode_control(Bit8u val) {
      /* Check if someone changes the blinking/hi intensity bit */
      vga.tandy.mode_control=val;
      VGA_SetBlinking((val & 0x20));
      if (val & 0x2) {
            if (val & 0x10) {
            } else VGA_SetMode(M_CGA4);
            write_color_select(vga.tandy.color_select);     //Setup the correct palette
      } else {
            VGA_SetMode(M_TEXT);
      }
}

static void TANDY_FindMode(void) {
      if (vga.tandy.mode_control & 0x2) {
            if (vga.tandy.gfx_control & 0x10) VGA_SetMode(M_TANDY16);
            else if (vga.tandy.gfx_control & 0x08) VGA_SetMode(M_TANDY4);
            else if (vga.tandy.mode_control & 0x10) VGA_SetMode(M_TANDY2);
            else VGA_SetMode(M_TANDY4);
            write_color_select(vga.tandy.color_select);
      } else {
            VGA_SetMode(M_TANDY_TEXT);
      }
}

static void write_tandy_reg(Bit8u val) {
      switch (vga.tandy.reg_index) {
      case 0x2:   /* Border color */
            vga.tandy.border_color=val;
            break;
      case 0x3:   /* More control */
            vga.tandy.gfx_control=val;
            TANDY_FindMode();
            break;
      /* palette colors */
      case 0x10: case 0x11: case 0x12: case 0x13:
      case 0x14: case 0x15: case 0x16: case 0x17:
      case 0x18: case 0x19: case 0x1a: case 0x1b:
      case 0x1c: case 0x1d: case 0x1e: case 0x1f:
            VGA_ATTR_SetPalette(vga.tandy.reg_index-0x10,val & 0xf);
            break;
      default:          
            LOG(LOG_VGAMISC,LOG_NORMAL)("Unhandled Write %2X to tandy reg %X",val,vga.tandy.reg_index);
      }
}

static void write_cga(Bitu port,Bitu val,Bitu iolen) {
      switch (port) {
      case 0x3d8:
            vga.tandy.mode_control=val;
            if (vga.tandy.mode_control & 0x2) {
                  if (vga.tandy.mode_control & 0x10) {
                        if (val & 0x8 && machine==MCH_CGA) {
                              VGA_SetMode(M_CGA16);         //Video burst 16 160x200 color mode
                        } else {
                              VGA_SetMode(M_TANDY2);
                        }
                  } else VGA_SetMode(M_TANDY4);
                  write_color_select(vga.tandy.color_select);
            } else {
                  VGA_SetMode(M_TANDY_TEXT);
            }
            VGA_SetBlinking(val & 0x20);
            break;
      case 0x3d9:
            write_color_select(val);
            break;
      }
}

static void write_tandy(Bitu port,Bitu val,Bitu iolen) {
      switch (port) {
      case 0x3d8:
            vga.tandy.mode_control=val;
            VGA_SetBlinking(val & 0x20);
            TANDY_FindMode();
            break;
      case 0x3d9:
            write_color_select(val);
            break;
      case 0x3da:
            vga.tandy.reg_index=val;
            break;
      case 0x3de:
            write_tandy_reg(val);
            break;
      case 0x3df:
            vga.tandy.disp_bank=val & ((val & 0x80) ? 0x6 : 0x7);
            vga.tandy.mem_bank=(val >> 3) & ((val & 0x80) ? 0x6 : 0x7);
            VGA_SetupHandlers();
            break;
      }
}

static void write_hercules(Bitu port,Bitu val,Bitu iolen) {
      switch (port) {
      case 0x3b8:
            if (vga.herc.enable_bits & 1) {
                  vga.herc.mode_control&=~0x2;
                  vga.herc.mode_control|=(val&0x2);
                  if (val & 0x2) {
                        VGA_SetMode(M_HERC_GFX);
                  } else {
                        VGA_SetMode(M_HERC_TEXT);
                  }
            }
            if ((vga.herc.enable_bits & 0x2) && ((vga.herc.mode_control ^ val)&0x80)) {
                  vga.herc.mode_control^=0x80;
                  VGA_SetupHandlers();
            }
            break;
      case 0x3bf:
            vga.herc.enable_bits=val;
            break;
      }
}

static Bitu read_hercules(Bitu port,Bitu iolen) {
      LOG_MSG("read from Herc port %x",port);
      return 0;
}


void VGA_SetupOther(void) {
      Bitu i;
      if (machine==MCH_CGA || machine==MCH_TANDY) {
            extern Bit8u int10_font_08[256 * 8];
            for (i=0;i<256;i++)     memcpy(&vga.draw.font[i*32],&int10_font_08[i*8],8);
            vga.draw.font_tables[0]=vga.draw.font_tables[1]=vga.draw.font;
      }
      if (machine==MCH_HERC) {
            extern Bit8u int10_font_14[256 * 14];
            for (i=0;i<256;i++)     memcpy(&vga.draw.font[i*32],&int10_font_14[i*14],14);
            vga.draw.font_tables[0]=vga.draw.font_tables[1]=vga.draw.font;
      }
      if (machine==MCH_CGA) {
            IO_RegisterWriteHandler(0x3d8,write_cga,IO_MB);
            IO_RegisterWriteHandler(0x3d9,write_cga,IO_MB);
      }
      if (machine==MCH_HERC) {
            vga.herc.enable_bits=0;
            vga.herc.mode_control=0x8;
            IO_RegisterWriteHandler(0x3b8,write_hercules,IO_MB);
            IO_RegisterWriteHandler(0x3bf,write_hercules,IO_MB);
      }
      if (machine==MCH_TANDY) {
            IO_RegisterWriteHandler(0x3d8,write_tandy,IO_MB);
            IO_RegisterWriteHandler(0x3d9,write_tandy,IO_MB);
            IO_RegisterWriteHandler(0x3de,write_tandy,IO_MB);
            IO_RegisterWriteHandler(0x3df,write_tandy,IO_MB);
            IO_RegisterWriteHandler(0x3da,write_tandy,IO_MB);
      }
      if (machine==MCH_CGA || machine==MCH_HERC || machine==MCH_TANDY) {
            Bitu base=machine==MCH_HERC ? 0x3b4 : 0x3d4;
            IO_RegisterWriteHandler(base,write_crtc_index_other,IO_MB);
            IO_RegisterWriteHandler(base+1,write_crtc_data_other,IO_MB);
            IO_RegisterReadHandler(base,read_crtc_index_other,IO_MB);
            IO_RegisterReadHandler(base+1,read_crtc_data_other,IO_MB);
      }

}


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