// license:BSD-3-Clause // copyright-holders:Wilbert Pol, Miodrag Milanovic /*************************************************************************** Monochrome Display Adapter (MDA) section ***************************************************************************/ #include "emu.h" #include "mda.h" #include "video/mc6845.h" #include "machine/pc_lpt.h" #define MDA_SCREEN_NAME "mda_screen" #define MDA_MC6845_NAME "mc6845_mda" /* Hercules video card */ #define HERCULES_SCREEN_NAME "hercules_screen" #define HERCULES_MC6845_NAME "mc6845_hercules" #define VERBOSE_MDA 0 /* MDA (Monochrome Display Adapter) */ #define MDA_CLOCK 16257000 #define MDA_LOG(N,M,A) \ do { \ if(VERBOSE_MDA>=N) \ { \ if( M ) \ logerror("%11.6f: %-24s",machine().time().as_double(),(char*)M ); \ logerror A; \ } \ } while (0) static const unsigned char mda_palette[4][3] = { { 0x00,0x00,0x00 }, { 0x00,0x55,0x00 }, { 0x00,0xaa,0x00 }, { 0x00,0xff,0x00 } }; enum { MDA_TEXT_INTEN = 0, MDA_TEXT_BLINK, HERCULES_GFX_BLINK, MDA_LOWRES_TEXT_INTEN, MDA_LOWRES_TEXT_BLINK }; /* F4 Character Displayer */ static const gfx_layout pc_16_charlayout = { 8, 16, /* 8 x 16 characters */ 256, /* 256 characters */ 1, /* 1 bits per pixel */ { 0 }, /* no bitplanes */ /* x offsets */ { 0, 1, 2, 3, 4, 5, 6, 7 }, /* y offsets */ { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 2048*8, 2049*8, 2050*8, 2051*8, 2052*8, 2053*8, 2054*8, 2055*8 }, 8*8 /* every char takes 2 x 8 bytes */ }; static const gfx_layout pc_8_charlayout = { 8, 8, /* 8 x 8 characters */ 512, /* 512 characters */ 1, /* 1 bits per pixel */ { 0 }, /* no bitplanes */ /* x offsets */ { 0, 1, 2, 3, 4, 5, 6, 7 }, /* y offsets */ { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8 }, 8*8 /* every char takes 8 bytes */ }; static GFXDECODE_START( pcmda ) GFXDECODE_ENTRY( "gfx1", 0x0000, pc_16_charlayout, 1, 1 ) GFXDECODE_ENTRY( "gfx1", 0x1000, pc_8_charlayout, 1, 1 ) GFXDECODE_END WRITE_LINE_MEMBER(isa8_mda_device::pc_cpu_line) { m_isa->irq7_w(state); } MACHINE_CONFIG_FRAGMENT( pcvideo_mda ) MCFG_SCREEN_ADD( MDA_SCREEN_NAME, RASTER) MCFG_SCREEN_RAW_PARAMS(MDA_CLOCK, 882, 0, 720, 370, 0, 350 ) MCFG_SCREEN_UPDATE_DEVICE( MDA_MC6845_NAME, mc6845_device, screen_update ) MCFG_PALETTE_ADD( "palette", 4 ) MCFG_MC6845_ADD(MDA_MC6845_NAME, MC6845, MDA_SCREEN_NAME, MDA_CLOCK/9) MCFG_MC6845_SHOW_BORDER_AREA(false) MCFG_MC6845_CHAR_WIDTH(9) MCFG_MC6845_UPDATE_ROW_CB(isa8_mda_device, crtc_update_row) MCFG_MC6845_OUT_HSYNC_CB(WRITELINE(isa8_mda_device, hsync_changed)) MCFG_MC6845_OUT_VSYNC_CB(WRITELINE(isa8_mda_device, vsync_changed)) MCFG_GFXDECODE_ADD("gfxdecode", "palette", pcmda) MCFG_DEVICE_ADD("lpt", PC_LPT, 0) MCFG_PC_LPT_IRQ_HANDLER(WRITELINE(isa8_mda_device, pc_cpu_line)) MACHINE_CONFIG_END ROM_START( mda ) /* IBM 1501981(CGA) and 1501985(MDA) Character rom */ ROM_REGION(0x08100,"gfx1", 0) ROM_LOAD("5788005.u33", 0x00000, 0x02000, CRC(0bf56d70) SHA1(c2a8b10808bf51a3c123ba3eb1e9dd608231916f)) /* "AMI 8412PI // 5788005 // (C) IBM CORP. 1981 // KOREA" */ ROM_END //************************************************************************** // GLOBAL VARIABLES //************************************************************************** const device_type ISA8_MDA = &device_creator; //------------------------------------------------- // machine_config_additions - device-specific // machine configurations //------------------------------------------------- machine_config_constructor isa8_mda_device::device_mconfig_additions() const { return MACHINE_CONFIG_NAME( pcvideo_mda ); } //------------------------------------------------- // rom_region - device-specific ROM region //------------------------------------------------- const rom_entry *isa8_mda_device::device_rom_region() const { return ROM_NAME( mda ); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // isa8_mda_device - constructor //------------------------------------------------- isa8_mda_device::isa8_mda_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, ISA8_MDA, "IBM Monochrome Display and Printer Adapter", tag, owner, clock, "isa_ibm_mda", __FILE__), device_isa8_card_interface(mconfig, *this), m_update_row_type(-1), m_palette(*this, "palette") { } isa8_mda_device::isa8_mda_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source) : device_t(mconfig, type, name, tag, owner, clock, shortname, source), device_isa8_card_interface(mconfig, *this), m_update_row_type(-1), m_palette(*this, "palette") { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void isa8_mda_device::device_start() { if (m_palette != NULL && !m_palette->started()) throw device_missing_dependencies(); set_isa_device(); m_videoram.resize(0x1000); m_isa->install_device(0x3b0, 0x3bf, 0, 0, read8_delegate( FUNC(isa8_mda_device::io_read), this ), write8_delegate( FUNC(isa8_mda_device::io_write), this ) ); m_isa->install_bank(0xb0000, 0xb0fff, 0, 0x07000, "bank_mda", &m_videoram[0]); /* Initialise the mda palette */ for(int i = 0; i < 4; i++) m_palette->set_pen_color(i, rgb_t(mda_palette[i][0], mda_palette[i][1], mda_palette[i][2])); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void isa8_mda_device::device_reset() { m_framecnt = 0; m_mode_control = 0; m_vsync = 0; m_hsync = 0; m_pixel = 0; m_chr_gen = memregion(subtag("gfx1").c_str())->base(); } /*************************************************************************** Monochrome Display Adapter (MDA) section ***************************************************************************/ /*************************************************************************** Draw text mode with 80x25 characters (default) and intense background. The character cell size is 9x15. Column 9 is column 8 repeated for character codes 176 to 223. ***************************************************************************/ MC6845_UPDATE_ROW( isa8_mda_device::mda_text_inten_update_row ) { const rgb_t *palette = m_palette->palette()->entry_list_raw(); UINT32 *p = &bitmap.pix32(y); UINT16 chr_base = ( ra & 0x08 ) ? 0x800 | ( ra & 0x07 ) : ra; int i; if ( y == 0 ) MDA_LOG(1,"mda_text_inten_update_row",("\n")); for ( i = 0; i < x_count; i++ ) { UINT16 offset = ( ( ma + i ) << 1 ) & 0x0FFF; UINT8 chr = m_videoram[ offset ]; UINT8 attr = m_videoram[ offset + 1 ]; UINT8 data = m_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 && ( m_framecnt & 0x08 ) ) || ( 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++; } } } /*************************************************************************** Draw text mode with 80x25 characters (default) and blinking characters. The character cell size is 9x15. Column 9 is column 8 repeated for character codes 176 to 223. ***************************************************************************/ MC6845_UPDATE_ROW( isa8_mda_device::mda_text_blink_update_row ) { const rgb_t *palette = m_palette->palette()->entry_list_raw(); UINT32 *p = &bitmap.pix32(y); UINT16 chr_base = ( ra & 0x08 ) ? 0x800 | ( ra & 0x07 ) : ra; int i; if ( y == 0 ) MDA_LOG(1,"mda_text_blink_update_row",("\n")); for ( i = 0; i < x_count; i++ ) { UINT16 offset = ( ( ma + i ) << 1 ) & 0x0FFF; UINT8 chr = m_videoram[ offset ]; UINT8 attr = m_videoram[ offset + 1 ]; UINT8 data = m_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 ( ( attr & 0x07 ) == 0x01 ) { data = 0xFF; } if ( i == cursor_x ) { if ( m_framecnt & 0x08 ) { data = 0xFF; } } else { if ( ( attr & 0x80 ) && ( m_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++; if ( ( chr & 0xE0 ) == 0xC0 ) { *p = palette[( data & 0x01 ) ? fg : bg]; p++; } else { *p = palette[bg]; p++; } } } MC6845_UPDATE_ROW( isa8_mda_device::crtc_update_row ) { if (m_update_row_type == -1) return; switch (m_update_row_type) { case MDA_TEXT_INTEN: mda_text_inten_update_row(bitmap, cliprect, ma, ra, y, x_count, cursor_x, de, hbp, vbp); break; case MDA_TEXT_BLINK: mda_text_blink_update_row(bitmap, cliprect, ma, ra, y, x_count, cursor_x, de, hbp, vbp); break; } } MC6845_UPDATE_ROW( isa8_hercules_device::crtc_update_row ) { if (m_update_row_type == -1) return; switch (m_update_row_type) { case HERCULES_GFX_BLINK: hercules_gfx_update_row(bitmap, cliprect, ma, ra, y, x_count, cursor_x, de, hbp, vbp); break; default: isa8_mda_device::crtc_update_row(bitmap, cliprect, ma, ra, y, x_count, cursor_x, de, hbp, vbp); break; } } WRITE_LINE_MEMBER( isa8_mda_device::hsync_changed ) { m_hsync = state ? 1 : 0; } WRITE_LINE_MEMBER( isa8_mda_device::vsync_changed ) { m_vsync = state ? 0x80 : 0; if ( state ) { m_framecnt++; } } /* * rW MDA mode control register (see #P138) */ WRITE8_MEMBER( isa8_mda_device::mode_control_w ) { m_mode_control = data; switch( m_mode_control & 0x2a ) { case 0x08: m_update_row_type = MDA_TEXT_INTEN; break; case 0x28: m_update_row_type = MDA_TEXT_BLINK; break; default: m_update_row_type = -1; } } /* R- CRT status register (see #P139) * (EGA/VGA) input status 1 register * 7 HGC vertical sync in progress * 6-4 adapter 000 hercules * 001 hercules+ * 101 hercules InColor * else unknown * 3 pixel stream (0 black, 1 white) * 2-1 reserved * 0 horizontal drive enable */ READ8_MEMBER( isa8_mda_device::status_r) { // Faking pixel stream here m_pixel++; return 0xF0 | (m_pixel & 0x08) | m_hsync; } /************************************************************************* * * MDA * monochrome display adapter * *************************************************************************/ WRITE8_MEMBER( isa8_mda_device::io_write) { mc6845_device *mc6845 = subdevice(MDA_MC6845_NAME); pc_lpt_device *lpt = subdevice("lpt"); 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: mode_control_w(space, offset, data); break; case 12: case 13: case 14: lpt->write(space, offset - 12, data); break; } } READ8_MEMBER( isa8_mda_device::io_read) { int data = 0xff; mc6845_device *mc6845 = subdevice(MDA_MC6845_NAME); pc_lpt_device *lpt = subdevice("lpt"); 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 = status_r(space, offset); break; /* 12, 13, 14 are the LPT ports */ case 12: case 13: case 14: data = lpt->read(space, offset - 12); break; } return data; } /*************************************************************************** Hercules Display Adapter section (re-uses parts from the MDA section) ***************************************************************************/ /* When the Hercules changes to graphics mode, the number of pixels per access and clock divider should be changed. The currect mc6845 implementation does not allow this. The divder/pixels per 6845 clock is 9 for text mode and 16 for graphics mode. */ static GFXDECODE_START( pcherc ) GFXDECODE_ENTRY( "gfx1", 0x0000, pc_16_charlayout, 1, 1 ) GFXDECODE_END MACHINE_CONFIG_FRAGMENT( pcvideo_hercules ) MCFG_SCREEN_ADD( HERCULES_SCREEN_NAME, RASTER) MCFG_SCREEN_RAW_PARAMS(MDA_CLOCK, 882, 0, 720, 370, 0, 350 ) MCFG_SCREEN_UPDATE_DEVICE( HERCULES_MC6845_NAME, mc6845_device, screen_update ) MCFG_PALETTE_ADD( "palette", 4 ) MCFG_MC6845_ADD(HERCULES_MC6845_NAME, MC6845, HERCULES_SCREEN_NAME, MDA_CLOCK/9) MCFG_MC6845_SHOW_BORDER_AREA(false) MCFG_MC6845_CHAR_WIDTH(9) MCFG_MC6845_UPDATE_ROW_CB(isa8_hercules_device, crtc_update_row) MCFG_MC6845_OUT_HSYNC_CB(WRITELINE(isa8_mda_device, hsync_changed)) MCFG_MC6845_OUT_VSYNC_CB(WRITELINE(isa8_mda_device, vsync_changed)) MCFG_GFXDECODE_ADD("gfxdecode", "palette", pcherc) MCFG_DEVICE_ADD("lpt", PC_LPT, 0) MCFG_PC_LPT_IRQ_HANDLER(WRITELINE(isa8_mda_device, pc_cpu_line)) MACHINE_CONFIG_END ROM_START( hercules ) ROM_REGION(0x1000,"gfx1", 0) ROM_LOAD("um2301.bin", 0x00000, 0x1000, CRC(0827bdac) SHA1(15f1aceeee8b31f0d860ff420643e3c7f29b5ffc)) ROM_END //************************************************************************** // GLOBAL VARIABLES //************************************************************************** const device_type ISA8_HERCULES = &device_creator; //------------------------------------------------- // machine_config_additions - device-specific // machine configurations //------------------------------------------------- machine_config_constructor isa8_hercules_device::device_mconfig_additions() const { return MACHINE_CONFIG_NAME( pcvideo_hercules ); } //------------------------------------------------- // rom_region - device-specific ROM region //------------------------------------------------- const rom_entry *isa8_hercules_device::device_rom_region() const { return ROM_NAME( hercules ); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // isa8_hercules_device - constructor //------------------------------------------------- isa8_hercules_device::isa8_hercules_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : isa8_mda_device(mconfig, ISA8_HERCULES, "Hercules Graphics Card", tag, owner, clock, "isa_hercules", __FILE__) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void isa8_hercules_device::device_start() { if (m_palette != NULL && !m_palette->started()) throw device_missing_dependencies(); m_videoram.resize(0x10000); set_isa_device(); m_isa->install_device(0x3b0, 0x3bf, 0, 0, read8_delegate( FUNC(isa8_hercules_device::io_read), this ), write8_delegate( FUNC(isa8_hercules_device::io_write), this ) ); m_isa->install_bank(0xb0000, 0xbffff, 0, 0, "bank_hercules", &m_videoram[0]); /* Initialise the mda palette */ for(int i = 0; i < (sizeof(mda_palette) / 3); i++) m_palette->set_pen_color(i, mda_palette[i][0], mda_palette[i][1], mda_palette[i][2]); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void isa8_hercules_device::device_reset() { isa8_mda_device::device_reset(); m_configuration_switch = 0; m_chr_gen = memregion(subtag("gfx1").c_str())->base(); } /*************************************************************************** Draw graphics with 720x348 pixels (default); so called Hercules gfx. The memory layout is divided into 4 banks where of size 0x2000. Every bank holds data for every n'th scanline, 8 pixels per byte, bit 7 being the leftmost. ***************************************************************************/ MC6845_UPDATE_ROW( isa8_hercules_device::hercules_gfx_update_row ) { const rgb_t *palette = m_palette->palette()->entry_list_raw(); UINT32 *p = &bitmap.pix32(y); UINT16 gfx_base = ( ( m_mode_control & 0x80 ) ? 0x8000 : 0x0000 ) | ( ( ra & 0x03 ) << 13 ); int i; if ( y == 0 ) MDA_LOG(1,"hercules_gfx_update_row",("\n")); for ( i = 0; i < x_count; i++ ) { UINT8 data = m_videoram[ gfx_base + ( ( ma + i ) << 1 ) ]; *p = palette[( data & 0x80 ) ? 2 : 0]; p++; *p = palette[( data & 0x40 ) ? 2 : 0]; p++; *p = palette[( data & 0x20 ) ? 2 : 0]; p++; *p = palette[( data & 0x10 ) ? 2 : 0]; p++; *p = palette[( data & 0x08 ) ? 2 : 0]; p++; *p = palette[( data & 0x04 ) ? 2 : 0]; p++; *p = palette[( data & 0x02 ) ? 2 : 0]; p++; *p = palette[( data & 0x01 ) ? 2 : 0]; p++; data = m_videoram[ gfx_base + ( ( ma + i ) << 1 ) + 1 ]; *p = palette[( data & 0x80 ) ? 2 : 0]; p++; *p = palette[( data & 0x40 ) ? 2 : 0]; p++; *p = palette[( data & 0x20 ) ? 2 : 0]; p++; *p = palette[( data & 0x10 ) ? 2 : 0]; p++; *p = palette[( data & 0x08 ) ? 2 : 0]; p++; *p = palette[( data & 0x04 ) ? 2 : 0]; p++; *p = palette[( data & 0x02 ) ? 2 : 0]; p++; *p = palette[( data & 0x01 ) ? 2 : 0]; p++; } } WRITE8_MEMBER( isa8_hercules_device::mode_control_w ) { mc6845_device *mc6845 = subdevice(HERCULES_MC6845_NAME); m_mode_control = data; switch( m_mode_control & 0x2a ) { case 0x08: m_update_row_type = MDA_TEXT_INTEN; break; case 0x28: m_update_row_type = MDA_TEXT_BLINK; break; case 0x0A: /* Hercules modes */ case 0x2A: m_update_row_type = HERCULES_GFX_BLINK; break; default: m_update_row_type = -1; } mc6845->set_clock( m_mode_control & 0x02 ? MDA_CLOCK / 16 : MDA_CLOCK / 9 ); mc6845->set_hpixels_per_column( m_mode_control & 0x02 ? 16 : 9 ); } WRITE8_MEMBER( isa8_hercules_device::io_write ) { mc6845_device *mc6845 = subdevice(HERCULES_MC6845_NAME); pc_lpt_device *lpt = subdevice("lpt"); 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: mode_control_w(space, offset, data); break; case 12: case 13: case 14: lpt->write(space, offset - 12, data); break; case 15: m_configuration_switch = data; break; } } /* R- CRT status register (see #P139) * (EGA/VGA) input status 1 register * 7 HGC vertical sync in progress * 6-4 adapter 000 hercules * 001 hercules+ * 101 hercules InColor * else unknown * 3 pixel stream (0 black, 1 white) * 2-1 reserved * 0 horizontal drive enable */ READ8_MEMBER( isa8_hercules_device::status_r ) { // Faking pixel stream here m_pixel++; return m_vsync | ( m_pixel & 0x08 ) | m_hsync; } READ8_MEMBER( isa8_hercules_device::io_read ) { int data = 0xff; mc6845_device *mc6845 = subdevice(HERCULES_MC6845_NAME); pc_lpt_device *lpt = subdevice("lpt"); 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 = status_r(space, offset); break; /* 12, 13, 14 are the LPT ports */ case 12: case 13: case 14: data = lpt->read(space, offset - 12); break; } return data; } // XXX MACHINE_CONFIG_FRAGMENT( pcvideo_ec1840_0002 ) MCFG_SCREEN_ADD( MDA_SCREEN_NAME, RASTER) MCFG_SCREEN_RAW_PARAMS(MDA_CLOCK, 792, 0, 640, 370, 0, 350 ) MCFG_SCREEN_UPDATE_DEVICE( MDA_MC6845_NAME, mc6845_device, screen_update ) MCFG_PALETTE_ADD( "palette", 4 ) MCFG_MC6845_ADD( MDA_MC6845_NAME, MC6845, MDA_SCREEN_NAME, MDA_CLOCK/8) MCFG_MC6845_SHOW_BORDER_AREA(false) MCFG_MC6845_CHAR_WIDTH(8) MCFG_MC6845_UPDATE_ROW_CB(isa8_mda_device, crtc_update_row) MCFG_MC6845_OUT_HSYNC_CB(WRITELINE(isa8_mda_device, hsync_changed)) MCFG_MC6845_OUT_VSYNC_CB(WRITELINE(isa8_mda_device, vsync_changed)) MACHINE_CONFIG_END const device_type ISA8_EC1840_0002 = &device_creator; //------------------------------------------------- // machine_config_additions - device-specific // machine configurations //------------------------------------------------- machine_config_constructor isa8_ec1840_0002_device::device_mconfig_additions() const { return MACHINE_CONFIG_NAME( pcvideo_ec1840_0002 ); } //------------------------------------------------- // isa8_ec1840_0002_device - constructor //------------------------------------------------- isa8_ec1840_0002_device::isa8_ec1840_0002_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : isa8_mda_device( mconfig, ISA8_EC1840_0002, "EC 1840.0002 (MDA)", tag, owner, clock, "ec1840_0002", __FILE__) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void isa8_ec1840_0002_device::device_start() { isa8_mda_device::device_start(); m_soft_chr_gen = auto_alloc_array(machine(), UINT8, 0x2000); m_isa->install_bank(0xdc000, 0xddfff, 0, 0x2000, "bank_chargen", m_soft_chr_gen); } void isa8_ec1840_0002_device::device_reset() { isa8_mda_device::device_reset(); m_chr_gen = m_soft_chr_gen; } /*************************************************************************** Draw text mode with 80x25 characters (default) and intense background. The character cell size is 8x14. ***************************************************************************/ MC6845_UPDATE_ROW( isa8_ec1840_0002_device::mda_lowres_text_inten_update_row ) { const rgb_t *palette = m_palette->palette()->entry_list_raw(); UINT32 *p = &bitmap.pix32(y); UINT16 chr_base = ra; int i; if ( y == 0 ) MDA_LOG(1,"mda_lowres_text_inten_update_row",("\n")); for ( i = 0; i < x_count; i++ ) { UINT16 offset = ( ( ma + i ) << 1 ) & 0x0FFF; UINT8 chr = m_videoram[ offset ]; UINT8 attr = m_videoram[ offset + 1 ]; UINT8 data = m_chr_gen[ (chr_base + chr * 16) << 1 ]; 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 && ( m_framecnt & 0x08 ) ) || ( 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++; } } /*************************************************************************** Draw text mode with 80x25 characters (default) and blinking characters. The character cell size is 8x14. ***************************************************************************/ MC6845_UPDATE_ROW( isa8_ec1840_0002_device::mda_lowres_text_blink_update_row ) { const rgb_t *palette = m_palette->palette()->entry_list_raw(); UINT32 *p = &bitmap.pix32(y); UINT16 chr_base = ra; int i; if ( y == 0 ) MDA_LOG(1,"mda_lowres_text_blink_update_row",("\n")); for ( i = 0; i < x_count; i++ ) { UINT16 offset = ( ( ma + i ) << 1 ) & 0x0FFF; UINT8 chr = m_videoram[ offset ]; UINT8 attr = m_videoram[ offset + 1 ]; UINT8 data = m_chr_gen[ (chr_base + chr * 16) << 1 ]; 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 ( ( attr & 0x07 ) == 0x01 ) { data = 0xFF; } if ( i == cursor_x ) { if ( m_framecnt & 0x08 ) { data = 0xFF; } } else { if ( ( attr & 0x80 ) && ( m_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++; } } WRITE8_MEMBER( isa8_ec1840_0002_device::mode_control_w ) { m_mode_control = data; switch( m_mode_control & 0x2a ) { case 0x08: m_update_row_type = MDA_LOWRES_TEXT_INTEN; break; case 0x28: m_update_row_type = MDA_LOWRES_TEXT_BLINK; break; default: m_update_row_type = -1; } } MC6845_UPDATE_ROW( isa8_ec1840_0002_device::crtc_update_row ) { if (m_update_row_type == -1) return; switch (m_update_row_type) { case MDA_LOWRES_TEXT_INTEN: mda_lowres_text_inten_update_row(bitmap, cliprect, ma, ra, y, x_count, cursor_x, de, hbp, vbp); break; case MDA_LOWRES_TEXT_BLINK: mda_lowres_text_blink_update_row(bitmap, cliprect, ma, ra, y, x_count, cursor_x, de, hbp, vbp); break; } }