/*****************************************************************************
*
* video/pc_aga.c
*
****************************************************************************/
#include "emu.h"
#include "video/pc_aga.h"
#include "video/pc_cga.h"
#include "includes/amstr_pc.h"
#include "video/mc6845.h"
#include "video/cgapal.h"
#include "drivlgcy.h"
#define CGA_MONITOR (space.machine().root_device().ioport("VIDEO")->read() & 0x1C)
#define CGA_MONITOR_RGB 0x00 /* Colour RGB */
#define CGA_MONITOR_MONO 0x04 /* Greyscale RGB */
#define CGA_MONITOR_COMPOSITE 0x08 /* Colour composite */
#define CGA_MONITOR_TELEVISION 0x0C /* Television */
#define CGA_MONITOR_LCD 0x10 /* LCD, eg PPC512 */
static VIDEO_START( pc_aga );
static PALETTE_INIT( pc_aga );
static MC6845_UPDATE_ROW( aga_update_row );
static WRITE_LINE_DEVICE_HANDLER( aga_hsync_changed );
static WRITE_LINE_DEVICE_HANDLER( aga_vsync_changed );
static VIDEO_START( pc200 );
static MC6845_INTERFACE( mc6845_aga_intf )
{
false, /* show border area */
8, /* numbers of pixels per video memory address */
NULL, /* begin_update */
aga_update_row, /* update_row */
NULL, /* end_update */
DEVCB_NULL, /* on_de_chaged */
DEVCB_NULL, /* on_cur_chaged */
DEVCB_LINE(aga_hsync_changed), /* on_hsync_changed */
DEVCB_LINE(aga_vsync_changed), /* on_vsync_changed */
NULL
};
static struct {
AGA_MODE mode;
UINT8 mda_mode_control;
UINT8 mda_status;
UINT8 *mda_chr_gen;
UINT8 cga_mode_control;
UINT8 cga_color_select;
UINT8 cga_status;
UINT8 *cga_chr_gen;
UINT8 pc_framecnt;
mc6845_update_row_func update_row;
UINT8 cga_palette_lut_2bpp[4];
UINT8 vsync;
UINT8 hsync;
UINT8 *videoram;
} aga;
MACHINE_CONFIG_FRAGMENT( pcvideo_aga )
MCFG_SCREEN_ADD( AGA_SCREEN_NAME, RASTER )
MCFG_SCREEN_RAW_PARAMS( XTAL_14_31818MHz,912,0,640,262,0,200 )
MCFG_SCREEN_UPDATE_DEVICE( AGA_MC6845_NAME, mc6845_device, screen_update )
MCFG_PALETTE_LENGTH( CGA_PALETTE_SETS * 16 )
MCFG_PALETTE_INIT( pc_aga )
MCFG_MC6845_ADD( AGA_MC6845_NAME, MC6845, AGA_SCREEN_NAME, XTAL_14_31818MHz/8, mc6845_aga_intf )
MCFG_VIDEO_START( pc_aga )
MACHINE_CONFIG_END
MACHINE_CONFIG_FRAGMENT( pcvideo_pc200 )
MCFG_FRAGMENT_ADD( pcvideo_aga )
MCFG_VIDEO_START( pc200 )
MACHINE_CONFIG_END
/* Initialise the cga palette */
PALETTE_INIT( pc_aga )
{
int i;
for(i = 0; i < CGA_PALETTE_SETS * 16; i++)
palette_set_color_rgb(machine, i, cga_palette[i][0], cga_palette[i][1], cga_palette[i][2]);
}
static MC6845_UPDATE_ROW( aga_update_row ) {
if ( aga.update_row ) {
aga.update_row( device, bitmap, cliprect, ma, ra, y, x_count, cursor_x, param );
}
}
static WRITE_LINE_DEVICE_HANDLER( aga_hsync_changed ) {
aga.hsync = state ? 1 : 0;
}
static WRITE_LINE_DEVICE_HANDLER( aga_vsync_changed ) {
aga.vsync = state ? 8 : 0;
if ( state ) {
aga.pc_framecnt++;
}
}
/*************************************
*
* row update functions
*
*************************************/
/* colors need fixing in the mda_text_* functions ! */
static MC6845_UPDATE_ROW( mda_text_inten_update_row ) {
const rgb_t *palette = palette_entry_list_raw(bitmap.palette());
UINT8 *videoram = aga.videoram;
UINT32 *p = &bitmap.pix32(y);
UINT16 chr_base = ( ra & 0x08 ) ? 0x800 | ( ra & 0x07 ) : ra;
int i;
if ( y == 0 ) logerror("mda_text_inten_update_row\n");
for ( i = 0; i < x_count; i++ ) {
UINT16 offset = ( ( ma + i ) << 1 ) & 0x0FFF;
UINT8 chr = videoram[ offset ];
UINT8 attr = videoram[ offset + 1 ];
UINT8 data = aga.mda_chr_gen[ chr_base + chr * 8 ];
UINT8 fg = ( attr & 0x08 ) ? 3 : 2;
UINT8 bg = 0;
if ( ( attr & ~0x88 ) == 0 ) {
data = 0x00;
}
switch( attr ) {
case 0x70:
bg = 2;
fg = 0;
break;
case 0x78:
bg = 2;
fg = 1;
break;
case 0xF0:
bg = 3;
fg = 0;
break;
case 0xF8:
bg = 3;
fg = 1;
break;
}
if ( i == cursor_x || ( attr & 0x07 ) == 0x01 ) {
data = 0xFF;
}
*p = palette[( data & 0x80 ) ? fg : bg]; p++;
*p = palette[( data & 0x40 ) ? fg : bg]; p++;
*p = palette[( data & 0x20 ) ? fg : bg]; p++;
*p = palette[( data & 0x10 ) ? fg : bg]; p++;
*p = palette[( data & 0x08 ) ? fg : bg]; p++;
*p = palette[( data & 0x04 ) ? fg : bg]; p++;
*p = palette[( data & 0x02 ) ? fg : bg]; p++;
*p = palette[( data & 0x01 ) ? fg : bg]; p++;
if ( ( chr & 0xE0 ) == 0xC0 ) {
*p = palette[( data & 0x01 ) ? fg : bg]; p++;
} else {
*p = palette[bg]; p++;
}
}
}
static MC6845_UPDATE_ROW( mda_text_blink_update_row ) {
UINT8 *videoram = aga.videoram;
const rgb_t *palette = palette_entry_list_raw(bitmap.palette());
UINT32 *p = &bitmap.pix32(y);
UINT16 chr_base = ( ra & 0x08 ) ? 0x800 | ( ra & 0x07 ) : ra;
int i;
if ( y == 0 ) logerror("mda_text_blink_update_row\n");
for ( i = 0; i < x_count; i++ ) {
UINT16 offset = ( ( ma + i ) << 1 ) & 0x0FFF;
UINT8 chr = videoram[ offset ];
UINT8 attr = videoram[ offset + 1 ];
UINT8 data = aga.mda_chr_gen[ chr_base + chr * 8 ];
UINT8 fg = ( attr & 0x08 ) ? 3 : 2;
UINT8 bg = 0;
if ( ( attr & ~0x88 ) == 0 ) {
data = 0x00;
}
switch( attr ) {
case 0x70:
case 0xF0:
bg = 2;
fg = 0;
break;
case 0x78:
case 0xF8:
bg = 2;
fg = 1;
break;
}
if ( i == cursor_x ) {
data = 0xFF;
} else {
if ( ( attr & 0x07 ) == 0x01 ) {
data = 0xFF;
}
if ( ( attr & 0x80 ) && ( aga.pc_framecnt & 0x40 ) ) {
data = 0x00;
}
}
*p = palette[( data & 0x80 ) ? fg : bg]; p++;
*p = palette[( data & 0x40 ) ? fg : bg]; p++;
*p = palette[( data & 0x20 ) ? fg : bg]; p++;
*p = palette[( data & 0x10 ) ? fg : bg]; p++;
*p = palette[( data & 0x08 ) ? fg : bg]; p++;
*p = palette[( data & 0x04 ) ? fg : bg]; p++;
*p = palette[( data & 0x02 ) ? fg : bg]; p++;
*p = palette[( data & 0x01 ) ? fg : bg]; p++;
if ( ( chr & 0xE0 ) == 0xC0 ) {
*p = palette[( data & 0x01 ) ? fg : bg]; p++;
} else {
*p = palette[bg]; p++;
}
}
}
static MC6845_UPDATE_ROW( cga_text_inten_update_row ) {
UINT8 *videoram = aga.videoram;
const rgb_t *palette = palette_entry_list_raw(bitmap.palette());
UINT32 *p = &bitmap.pix32(y);
int i;
if ( y == 0 ) logerror("cga_text_inten_update_row\n");
for ( i = 0; i < x_count; i++ ) {
UINT16 offset = ( ( ma + i ) << 1 ) & 0x3fff;
UINT8 chr = videoram[ offset ];
UINT8 attr = videoram[ offset +1 ];
UINT8 data = aga.cga_chr_gen[ chr * 16 + ra ];
UINT16 fg = attr & 0x0F;
UINT16 bg = ( attr >> 4 ) & 0x07;
if ( i == cursor_x ) {
data = 0xFF;
}
*p = palette[( data & 0x80 ) ? fg : bg]; p++;
*p = palette[( data & 0x40 ) ? fg : bg]; p++;
*p = palette[( data & 0x20 ) ? fg : bg]; p++;
*p = palette[( data & 0x10 ) ? fg : bg]; p++;
*p = palette[( data & 0x08 ) ? fg : bg]; p++;
*p = palette[( data & 0x04 ) ? fg : bg]; p++;
*p = palette[( data & 0x02 ) ? fg : bg]; p++;
*p = palette[( data & 0x01 ) ? fg : bg]; p++;
}
}
static MC6845_UPDATE_ROW( cga_text_inten_alt_update_row ) {
const rgb_t *palette = palette_entry_list_raw(bitmap.palette());
UINT8 *videoram = aga.videoram;
UINT32 *p = &bitmap.pix32(y);
int i;
if ( y == 0 ) logerror("cga_text_inten_alt_update_row\n");
for ( i = 0; i < x_count; i++ ) {
UINT16 offset = ( ( ma + i ) << 1 ) & 0x3fff;
UINT8 chr = videoram[ offset ];
UINT8 attr = videoram[ offset +1 ];
UINT8 data = aga.cga_chr_gen[ chr * 16 + ra ];
UINT16 fg = attr & 0x0F;
if ( i == cursor_x ) {
data = 0xFF;
}
*p = palette[( data & 0x80 ) ? fg : 0]; p++;
*p = palette[( data & 0x40 ) ? fg : 0]; p++;
*p = palette[( data & 0x20 ) ? fg : 0]; p++;
*p = palette[( data & 0x10 ) ? fg : 0]; p++;
*p = palette[( data & 0x08 ) ? fg : 0]; p++;
*p = palette[( data & 0x04 ) ? fg : 0]; p++;
*p = palette[( data & 0x02 ) ? fg : 0]; p++;
*p = palette[( data & 0x01 ) ? fg : 0]; p++;
}
}
static MC6845_UPDATE_ROW( cga_text_blink_update_row ) {
const rgb_t *palette = palette_entry_list_raw(bitmap.palette());
UINT8 *videoram = aga.videoram;
UINT32 *p = &bitmap.pix32(y);
int i;
for ( i = 0; i < x_count; i++ ) {
UINT16 offset = ( ( ma + i ) << 1 ) & 0x3fff;
UINT8 chr = videoram[ offset ];
UINT8 attr = videoram[ offset +1 ];
UINT8 data = aga.cga_chr_gen[ chr * 16 + ra ];
UINT16 fg = attr & 0x0F;
UINT16 bg = (attr >> 4) & 0x07;
if ( i == cursor_x ) {
data = 0xFF;
} else {
if ( ( attr & 0x80 ) && ( aga.pc_framecnt & 0x10 ) ) {
data = 0x00;
}
}
*p = palette[( data & 0x80 ) ? fg : bg]; p++;
*p = palette[( data & 0x40 ) ? fg : bg]; p++;
*p = palette[( data & 0x20 ) ? fg : bg]; p++;
*p = palette[( data & 0x10 ) ? fg : bg]; p++;
*p = palette[( data & 0x08 ) ? fg : bg]; p++;
*p = palette[( data & 0x04 ) ? fg : bg]; p++;
*p = palette[( data & 0x02 ) ? fg : bg]; p++;
*p = palette[( data & 0x01 ) ? fg : bg]; p++;
}
}
static MC6845_UPDATE_ROW( cga_text_blink_alt_update_row ) {
const rgb_t *palette = palette_entry_list_raw(bitmap.palette());
UINT8 *videoram = aga.videoram;
UINT32 *p = &bitmap.pix32(y);
int i;
if ( y == 0 ) logerror("cga_text_blink_alt_update_row\n");
for ( i = 0; i < x_count; i++ ) {
UINT16 offset = ( ( ma + i ) << 1 ) & 0x3fff;
UINT8 chr = videoram[ offset ];
UINT8 attr = videoram[ offset +1 ];
UINT8 data = aga.cga_chr_gen[ chr * 16 + ra ];
UINT16 fg = attr & 0x07;
UINT16 bg = 0;
if ( i == cursor_x ) {
data = 0xFF;
} else {
if ( ( attr & 0x80 ) && ( aga.pc_framecnt & 0x10 ) ) {
data = 0x00;
bg = ( attr >> 4 ) & 0x07;
}
}
*p = palette[( data & 0x80 ) ? fg : bg]; p++;
*p = palette[( data & 0x40 ) ? fg : bg]; p++;
*p = palette[( data & 0x20 ) ? fg : bg]; p++;
*p = palette[( data & 0x10 ) ? fg : bg]; p++;
*p = palette[( data & 0x08 ) ? fg : bg]; p++;
*p = palette[( data & 0x04 ) ? fg : bg]; p++;
*p = palette[( data & 0x02 ) ? fg : bg]; p++;
*p = palette[( data & 0x01 ) ? fg : bg]; p++;
}
}
static MC6845_UPDATE_ROW( cga_gfx_4bppl_update_row ) {
const rgb_t *palette = palette_entry_list_raw(bitmap.palette());
UINT8 *videoram = aga.videoram;
UINT32 *p = &bitmap.pix32(y);
int i;
if ( y == 0 ) logerror("cga_gfx_4bppl_update_row\n");
for ( i = 0; i < x_count; i++ ) {
UINT16 offset = ( ( ( ma + i ) << 1 ) & 0x1fff ) | ( ( y & 1 ) << 13 );
UINT8 data = videoram[ offset ];
*p = palette[data >> 4]; p++;
*p = palette[data >> 4]; p++;
*p = palette[data & 0x0F]; p++;
*p = palette[data & 0x0F]; p++;
data = videoram[ offset + 1 ];
*p = palette[data >> 4]; p++;
*p = palette[data >> 4]; p++;
*p = palette[data & 0x0F]; p++;
*p = palette[data & 0x0F]; p++;
}
}
static MC6845_UPDATE_ROW( cga_gfx_4bpph_update_row ) {
UINT8 *videoram = aga.videoram;
const rgb_t *palette = palette_entry_list_raw(bitmap.palette());
UINT32 *p = &bitmap.pix32(y);
int i;
if ( y == 0 ) logerror("cga_gfx_4bpph_update_row\n");
for ( i = 0; i < x_count; i++ ) {
UINT16 offset = ( ( ( ma + i ) << 1 ) & 0x1fff ) | ( ( y & 1 ) << 13 );
UINT8 data = videoram[ offset ];
*p = palette[data >> 4]; p++;
*p = palette[data >> 4]; p++;
*p = palette[data >> 4]; p++;
*p = palette[data >> 4]; p++;
*p = palette[data & 0x0F]; p++;
*p = palette[data & 0x0F]; p++;
*p = palette[data & 0x0F]; p++;
*p = palette[data & 0x0F]; p++;
data = videoram[ offset + 1 ];
*p = palette[data >> 4]; p++;
*p = palette[data >> 4]; p++;
*p = palette[data >> 4]; p++;
*p = palette[data >> 4]; p++;
*p = palette[data & 0x0F]; p++;
*p = palette[data & 0x0F]; p++;
*p = palette[data & 0x0F]; p++;
*p = palette[data & 0x0F]; p++;
}
}
static MC6845_UPDATE_ROW( cga_gfx_2bpp_update_row ) {
UINT8 *videoram = aga.videoram;
const rgb_t *palette = palette_entry_list_raw(bitmap.palette());
UINT32 *p = &bitmap.pix32(y);
int i;
// if ( y == 0 ) logerror("cga_gfx_2bpp_update_row\n");
for ( i = 0; i < x_count; i++ ) {
UINT16 offset = ( ( ( ma + i ) << 1 ) & 0x1fff ) | ( ( y & 1 ) << 13 );
UINT8 data = videoram[ offset ];
*p = palette[aga.cga_palette_lut_2bpp[ ( data >> 6 ) & 0x03 ]]; p++;
*p = palette[aga.cga_palette_lut_2bpp[ ( data >> 4 ) & 0x03 ]]; p++;
*p = palette[aga.cga_palette_lut_2bpp[ ( data >> 2 ) & 0x03 ]]; p++;
*p = palette[aga.cga_palette_lut_2bpp[ data & 0x03 ]]; p++;
data = videoram[ offset+1 ];
*p = palette[aga.cga_palette_lut_2bpp[ ( data >> 6 ) & 0x03 ]]; p++;
*p = palette[aga.cga_palette_lut_2bpp[ ( data >> 4 ) & 0x03 ]]; p++;
*p = palette[aga.cga_palette_lut_2bpp[ ( data >> 2 ) & 0x03 ]]; p++;
*p = palette[aga.cga_palette_lut_2bpp[ data & 0x03 ]]; p++;
}
}
static MC6845_UPDATE_ROW( cga_gfx_1bpp_update_row ) {
UINT8 *videoram = aga.videoram;
const rgb_t *palette = palette_entry_list_raw(bitmap.palette());
UINT32 *p = &bitmap.pix32(y);
UINT8 fg = aga.cga_color_select & 0x0F;
int i;
if ( y == 0 ) logerror("cga_gfx_1bpp_update_row\n");
for ( i = 0; i < x_count; i++ ) {
UINT16 offset = ( ( ( ma + i ) << 1 ) & 0x1fff ) | ( ( ra & 1 ) << 13 );
UINT8 data = videoram[ offset ];
*p = palette[( data & 0x80 ) ? fg : 0]; p++;
*p = palette[( data & 0x40 ) ? fg : 0]; p++;
*p = palette[( data & 0x20 ) ? fg : 0]; p++;
*p = palette[( data & 0x10 ) ? fg : 0]; p++;
*p = palette[( data & 0x08 ) ? fg : 0]; p++;
*p = palette[( data & 0x04 ) ? fg : 0]; p++;
*p = palette[( data & 0x02 ) ? fg : 0]; p++;
*p = palette[( data & 0x01 ) ? fg : 0]; p++;
data = videoram[ offset + 1 ];
*p = palette[( data & 0x80 ) ? fg : 0]; p++;
*p = palette[( data & 0x40 ) ? fg : 0]; p++;
*p = palette[( data & 0x20 ) ? fg : 0]; p++;
*p = palette[( data & 0x10 ) ? fg : 0]; p++;
*p = palette[( data & 0x08 ) ? fg : 0]; p++;
*p = palette[( data & 0x04 ) ? fg : 0]; p++;
*p = palette[( data & 0x02 ) ? fg : 0]; p++;
*p = palette[( data & 0x01 ) ? fg : 0]; p++;
}
}
/*************************************
*
* AGA MDA/CGA read/write handlers
*
*************************************/
static READ8_HANDLER ( pc_aga_mda_r )
{
UINT8 data = 0xFF;
if ( aga.mode == AGA_MONO ) {
mc6845_device *mc6845 = space.machine().device<mc6845_device>(AGA_MC6845_NAME);
switch( offset )
{
case 0: case 2: case 4: case 6:
/* return last written mc6845 address value here? */
break;
case 1: case 3: case 5: case 7:
data = mc6845->register_r(space, offset);
break;
case 10:
data = (space.machine().root_device().ioport("IN0")->read() & 0x80 ) | 0x08 | aga.mda_status;
aga.mda_status ^= 0x01;
break;
/* 12, 13, 14 are the LPT1 ports */
}
}
return data;
}
static WRITE8_HANDLER ( pc_aga_mda_w )
{
if ( aga.mode == AGA_MONO ) {
mc6845_device *mc6845 = space.machine().device<mc6845_device>(AGA_MC6845_NAME);
switch( offset )
{
case 0: case 2: case 4: case 6:
mc6845->address_w( space, offset, data );
break;
case 1: case 3: case 5: case 7:
mc6845->register_w( space, offset, data );
break;
case 8:
aga.mda_mode_control = data;
switch( aga.mda_mode_control & 0x2a ) {
case 0x08:
aga.update_row = mda_text_inten_update_row;
break;
case 0x28:
aga.update_row = mda_text_blink_update_row;
break;
default:
aga.update_row = NULL;
}
break;
}
}
}
static READ8_HANDLER ( pc_aga_cga_r )
{
UINT8 data = 0xFF;
if ( aga.mode == AGA_COLOR ) {
mc6845_device *mc6845 = space.machine().device<mc6845_device>(AGA_MC6845_NAME);
switch( offset ) {
case 0: case 2: case 4: case 6:
/* return last written mc6845 address value here? */
break;
case 1: case 3: case 5: case 7:
data = mc6845->register_r( space, offset);
break;
case 10:
data = aga.vsync | ( ( data & 0x40 ) >> 4 ) | aga.hsync;
break;
}
}
return data;
}
static void pc_aga_set_palette_luts(void) {
/* Setup 2bpp palette lookup table */
if ( aga.cga_mode_control & 0x10 ) {
aga.cga_palette_lut_2bpp[0] = 0;
} else {
aga.cga_palette_lut_2bpp[0] = aga.cga_color_select & 0x0F;
}
if ( aga.cga_mode_control & 0x04 ) {
aga.cga_palette_lut_2bpp[1] = ( ( aga.cga_color_select & 0x10 ) >> 1 ) | 3;
aga.cga_palette_lut_2bpp[2] = ( ( aga.cga_color_select & 0x10 ) >> 1 ) | 4;
aga.cga_palette_lut_2bpp[3] = ( ( aga.cga_color_select & 0x10 ) >> 1 ) | 7;
} else {
if ( aga.cga_color_select & 0x20 ) {
aga.cga_palette_lut_2bpp[1] = ( ( aga.cga_color_select & 0x10 ) >> 1 ) | 3;
aga.cga_palette_lut_2bpp[2] = ( ( aga.cga_color_select & 0x10 ) >> 1 ) | 5;
aga.cga_palette_lut_2bpp[3] = ( ( aga.cga_color_select & 0x10 ) >> 1 ) | 7;
} else {
aga.cga_palette_lut_2bpp[1] = ( ( aga.cga_color_select & 0x10 ) >> 1 ) | 2;
aga.cga_palette_lut_2bpp[2] = ( ( aga.cga_color_select & 0x10 ) >> 1 ) | 4;
aga.cga_palette_lut_2bpp[3] = ( ( aga.cga_color_select & 0x10 ) >> 1 ) | 6;
}
}
//logerror("2bpp lut set to %d,%d,%d,%d\n", aga.cga_palette_lut_2bpp[0], aga.cga_palette_lut_2bpp[1], aga.cga_palette_lut_2bpp[2], aga.cga_palette_lut_2bpp[3]);
}
static WRITE8_HANDLER ( pc_aga_cga_w )
{
if ( aga.mode == AGA_COLOR ) {
mc6845_device *mc6845 = space.machine().device<mc6845_device>(AGA_MC6845_NAME);
switch(offset) {
case 0: case 2: case 4: case 6:
mc6845->address_w( space, offset, data );
break;
case 1: case 3: case 5: case 7:
mc6845->register_w( space, offset, data );
break;
case 8:
aga.cga_mode_control = data;
//logerror("mode set to %02X\n", aga.cga_mode_control & 0x3F );
switch ( aga.cga_mode_control & 0x3F ) {
case 0x08: case 0x09: case 0x0C: case 0x0D:
mc6845->set_hpixels_per_column( 8 );
aga.update_row = cga_text_inten_update_row;
break;
case 0x0A: case 0x0B: case 0x2A: case 0x2B:
mc6845->set_hpixels_per_column( 8 );
if ( CGA_MONITOR == CGA_MONITOR_COMPOSITE ) {
aga.update_row = cga_gfx_4bppl_update_row;
} else {
aga.update_row = cga_gfx_2bpp_update_row;
}
break;
case 0x0E: case 0x0F: case 0x2E: case 0x2F:
mc6845->set_hpixels_per_column( 8 );
aga.update_row = cga_gfx_2bpp_update_row;
break;
case 0x18: case 0x19: case 0x1C: case 0x1D:
mc6845->set_hpixels_per_column( 8 );
aga.update_row = cga_text_inten_alt_update_row;
break;
case 0x1A: case 0x1B: case 0x3A: case 0x3B:
mc6845->set_hpixels_per_column( 8 );
if ( CGA_MONITOR == CGA_MONITOR_COMPOSITE ) {
aga.update_row = cga_gfx_4bpph_update_row;
} else {
aga.update_row = cga_gfx_1bpp_update_row;
}
break;
case 0x1E: case 0x1F: case 0x3E: case 0x3F:
mc6845->set_hpixels_per_column( 16 );
aga.update_row = cga_gfx_1bpp_update_row;
break;
case 0x28: case 0x29: case 0x2C: case 0x2D:
mc6845->set_hpixels_per_column( 8 );
aga.update_row = cga_text_blink_update_row;
break;
case 0x38: case 0x39: case 0x3C: case 0x3D:
mc6845->set_hpixels_per_column( 8 );
aga.update_row = cga_text_blink_alt_update_row;
break;
default:
aga.update_row = NULL;
break;
}
pc_aga_set_palette_luts();
break;
case 9:
aga.cga_color_select = data;
pc_aga_set_palette_luts();
break;
}
}
}
/*************************************/
void pc_aga_set_mode(running_machine &machine, AGA_MODE mode)
{
mc6845_device *mc6845 = machine.device<mc6845_device>(AGA_MC6845_NAME);
aga.mode = mode;
switch (aga.mode) {
case AGA_COLOR:
mc6845->set_clock( XTAL_14_31818MHz/8 );
break;
case AGA_MONO:
mc6845->set_clock( 16257000/9 );
break;
case AGA_OFF:
break;
}
}
VIDEO_START( pc_aga )
{
address_space &space = machine.firstcpu->space(AS_PROGRAM);
address_space &spaceio = machine.firstcpu->space(AS_IO);
int buswidth = machine.firstcpu->space_config(AS_PROGRAM)->m_databus_width;
switch(buswidth)
{
case 8:
space.install_legacy_readwrite_handler(0xb0000, 0xbffff, FUNC(pc200_videoram_r), FUNC(pc200_videoram_w) );
spaceio.install_legacy_readwrite_handler(0x3b0, 0x3bf, FUNC(pc_aga_mda_r), FUNC(pc_aga_mda_w) );
spaceio.install_legacy_readwrite_handler(0x3d0, 0x3df, FUNC(pc_aga_cga_r), FUNC(pc_aga_cga_w) );
break;
case 16:
space.install_legacy_readwrite_handler(0xb0000, 0xbffff, FUNC(pc200_videoram_r), FUNC(pc200_videoram_w), 0xffff );
spaceio.install_legacy_readwrite_handler(0x3b0, 0x3bf, FUNC(pc_aga_mda_r), FUNC(pc_aga_mda_w), 0xffff );
spaceio.install_legacy_readwrite_handler(0x3d0, 0x3df, FUNC(pc_aga_cga_r), FUNC(pc_aga_cga_w), 0xffff );
break;
default:
fatalerror("AGA: Bus width %d not supported\n", buswidth);
break;
}
memset( &aga, 0, sizeof( aga ) );
aga.mode = AGA_COLOR;
aga.mda_chr_gen = machine.root_device().memregion("gfx1")->base() + 0x1000;
aga.cga_chr_gen = machine.root_device().memregion("gfx1")->base();
aga.videoram = auto_alloc_array(machine, UINT8, 0x10000);
}
VIDEO_START( pc200 )
{
address_space &space = machine.firstcpu->space(AS_PROGRAM);
address_space &spaceio = machine.firstcpu->space(AS_IO);
int buswidth = machine.firstcpu->space_config(AS_PROGRAM)->m_databus_width;
switch(buswidth)
{
case 8:
space.install_legacy_readwrite_handler(0xb0000, 0xbffff, FUNC(pc_aga_videoram_r), FUNC(pc_aga_videoram_w) );
spaceio.install_legacy_readwrite_handler(0x3b0, 0x3bf, FUNC(pc_aga_mda_r), FUNC(pc_aga_mda_w) );
spaceio.install_legacy_readwrite_handler(0x3d0, 0x3df, FUNC(pc200_cga_r), FUNC(pc200_cga_w) );
break;
case 16:
space.install_legacy_readwrite_handler(0xb0000, 0xbffff, FUNC(pc_aga_videoram_r), FUNC(pc_aga_videoram_w), 0xffff );
spaceio.install_legacy_readwrite_handler(0x3b0, 0x3bf, FUNC(pc_aga_mda_r), FUNC(pc_aga_mda_w), 0xffff );
spaceio.install_legacy_readwrite_handler(0x3d0, 0x3df, FUNC(pc200_cga_r), FUNC(pc200_cga_w), 0xffff );
break;
default:
fatalerror("AGA: Bus width %d not supported\n", buswidth);
break;
}
memset( &aga, 0, sizeof( aga ) );
aga.mode = AGA_COLOR;
aga.mda_chr_gen = machine.root_device().memregion("gfx1")->base();
aga.cga_chr_gen = machine.root_device().memregion("gfx1")->base() + 0x1000;
aga.videoram = auto_alloc_array(machine, UINT8, 0x10000);
memset(aga.videoram, 0, sizeof(UINT8) * 0x10000);
}
WRITE8_HANDLER ( pc_aga_videoram_w )
{
switch (aga.mode) {
case AGA_COLOR:
if (offset>=0x8000)
aga.videoram[offset-0x8000]=data;
break;
case AGA_MONO:
aga.videoram[offset]=data;
break;
case AGA_OFF: break;
}
}
READ8_HANDLER( pc_aga_videoram_r )
{
UINT8 *videoram = aga.videoram;
switch (aga.mode) {
case AGA_COLOR:
if (offset>=0x8000) return videoram[offset-0x8000];
return 0;
case AGA_MONO:
return videoram[offset];
case AGA_OFF: break;
}
return 0;
}
READ8_HANDLER( pc200_videoram_r )
{
UINT8 *videoram = aga.videoram;
switch (aga.mode)
{
default:
if (offset>=0x8000) return videoram[offset-0x8000];
return 0;
case AGA_MONO:
return videoram[offset];
}
return 0;
}
WRITE8_HANDLER ( pc200_videoram_w )
{
switch (aga.mode)
{
default:
if (offset>=0x8000)
aga.videoram[offset-0x8000]=data;
break;
case AGA_MONO:
aga.videoram[offset]=data;
break;
}
}
static struct {
UINT8 port8, portd, porte;
} pc200= { 0 };
// in reality it is of course only 1 graphics adapter,
// but now cga and mda are splitted in mess
WRITE8_HANDLER( pc200_cga_w )
{
pc_aga_cga_w(space, offset,data,mem_mask);
switch(offset) {
case 4:
pc200.portd |= 0x20;
break;
case 8:
pc200.port8 = data;
pc200.portd |= 0x80;
break;
case 0xe:
pc200.portd = 0x1f;
if (data & 0x80)
pc200.portd |= 0x40;
/* The bottom 3 bits of this port are:
* Bit 2: Disable AGA
* Bit 1: Select MDA
* Bit 0: Select external display (monitor) rather than internal display
* (TV for PC200; LCD for PPC512) */
if ((pc200.porte & 7) != (data & 7))
{
if (data & 4)
pc_aga_set_mode(space.machine(), AGA_OFF);
else if (data & 2)
pc_aga_set_mode(space.machine(), AGA_MONO);
else
pc_aga_set_mode(space.machine(), AGA_COLOR);
}
pc200.porte = data;
break;
default:
break;
}
}
READ8_HANDLER ( pc200_cga_r )
{
UINT8 result = 0xff;
switch(offset) {
case 8:
result = pc200.port8;
break;
case 0xd:
// after writing 0x80 to 0x3de, bits 7..5 of 0x3dd from the 2nd read must be 0
result=pc200.portd;
pc200.portd&=0x1f;
break;
case 0xe:
// 0x20 low cga
// 0x10 low special
result = space.machine().root_device().ioport("DSW0")->read() & 0x38;
break;
default:
result = pc_aga_cga_r(space, offset, mem_mask);
break;
}
return result;
}