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https://github.com/holub/mame
synced 2025-04-19 23:12:11 +03:00
ec184x: MDA clone
This commit is contained in:
Sergey Svishchev
parent
dbdef6bf0b
commit
b1ff333c73
@ -44,7 +44,9 @@ enum
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{
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MDA_TEXT_INTEN = 0,
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MDA_TEXT_BLINK,
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HERCULES_GFX_BLINK
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HERCULES_GFX_BLINK,
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MDA_LOWRES_TEXT_INTEN,
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MDA_LOWRES_TEXT_BLINK
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};
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/* F4 Character Displayer */
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@ -750,3 +752,230 @@ READ8_MEMBER( isa8_hercules_device::io_read )
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}
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return data;
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}
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// XXX
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MACHINE_CONFIG_FRAGMENT( pcvideo_ec1840_0002 )
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MCFG_SCREEN_ADD( MDA_SCREEN_NAME, RASTER)
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MCFG_SCREEN_RAW_PARAMS(MDA_CLOCK, 792, 0, 640, 370, 0, 350 )
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MCFG_SCREEN_UPDATE_DEVICE( MDA_MC6845_NAME, mc6845_device, screen_update )
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MCFG_PALETTE_ADD( "palette", 4 )
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MCFG_MC6845_ADD( MDA_MC6845_NAME, MC6845, MDA_SCREEN_NAME, MDA_CLOCK/8)
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MCFG_MC6845_SHOW_BORDER_AREA(false)
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MCFG_MC6845_CHAR_WIDTH(8)
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MCFG_MC6845_UPDATE_ROW_CB(isa8_mda_device, crtc_update_row)
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MCFG_MC6845_OUT_HSYNC_CB(WRITELINE(isa8_mda_device, hsync_changed))
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MCFG_MC6845_OUT_VSYNC_CB(WRITELINE(isa8_mda_device, vsync_changed))
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MACHINE_CONFIG_END
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const device_type ISA8_EC1840_0002 = &device_creator<isa8_ec1840_0002_device>;
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//-------------------------------------------------
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// machine_config_additions - device-specific
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// machine configurations
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//-------------------------------------------------
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machine_config_constructor isa8_ec1840_0002_device::device_mconfig_additions() const
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{
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return MACHINE_CONFIG_NAME( pcvideo_ec1840_0002 );
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}
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//-------------------------------------------------
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// isa8_ec1840_0002_device - constructor
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//-------------------------------------------------
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isa8_ec1840_0002_device::isa8_ec1840_0002_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
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isa8_mda_device( mconfig, ISA8_EC1840_0002, "EC 1840.0002 (MDA)", tag, owner, clock, "ec1840_0002", __FILE__)
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{
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}
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//-------------------------------------------------
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// device_start - device-specific startup
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//-------------------------------------------------
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void isa8_ec1840_0002_device::device_start()
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{
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isa8_mda_device::device_start();
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m_soft_chr_gen = auto_alloc_array(machine(), UINT8, 0x2000);
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m_isa->install_bank(0xdc000, 0xddfff, 0, 0x2000, "bank_chargen", m_soft_chr_gen);
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}
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void isa8_ec1840_0002_device::device_reset()
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{
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isa8_mda_device::device_reset();
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m_chr_gen = m_soft_chr_gen;
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}
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/***************************************************************************
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Draw text mode with 80x25 characters (default) and intense background.
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The character cell size is 8x14.
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***************************************************************************/
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MC6845_UPDATE_ROW( isa8_ec1840_0002_device::mda_lowres_text_inten_update_row )
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{
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const rgb_t *palette = m_palette->palette()->entry_list_raw();
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UINT32 *p = &bitmap.pix32(y);
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UINT16 chr_base = ra;
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int i;
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if ( y == 0 ) MDA_LOG(1,"mda_lowres_text_inten_update_row",("\n"));
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for ( i = 0; i < x_count; i++ )
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{
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UINT16 offset = ( ( ma + i ) << 1 ) & 0x0FFF;
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UINT8 chr = m_videoram[ offset ];
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UINT8 attr = m_videoram[ offset + 1 ];
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UINT8 data = m_chr_gen[ (chr_base + chr * 16) << 1 ];
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UINT8 fg = ( attr & 0x08 ) ? 3 : 2;
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UINT8 bg = 0;
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if ( ( attr & ~0x88 ) == 0 )
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{
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data = 0x00;
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}
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switch( attr )
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{
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case 0x70:
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bg = 2;
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fg = 0;
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break;
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case 0x78:
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bg = 2;
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fg = 1;
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break;
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case 0xF0:
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bg = 3;
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fg = 0;
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break;
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case 0xF8:
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bg = 3;
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fg = 1;
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break;
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}
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if ( ( i == cursor_x && ( m_framecnt & 0x08 ) ) || ( attr & 0x07 ) == 0x01 )
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{
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data = 0xFF;
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}
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*p = palette[( data & 0x80 ) ? fg : bg]; p++;
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*p = palette[( data & 0x40 ) ? fg : bg]; p++;
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*p = palette[( data & 0x20 ) ? fg : bg]; p++;
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*p = palette[( data & 0x10 ) ? fg : bg]; p++;
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*p = palette[( data & 0x08 ) ? fg : bg]; p++;
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*p = palette[( data & 0x04 ) ? fg : bg]; p++;
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*p = palette[( data & 0x02 ) ? fg : bg]; p++;
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*p = palette[( data & 0x01 ) ? fg : bg]; p++;
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}
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}
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/***************************************************************************
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Draw text mode with 80x25 characters (default) and blinking characters.
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The character cell size is 8x14.
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***************************************************************************/
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MC6845_UPDATE_ROW( isa8_ec1840_0002_device::mda_lowres_text_blink_update_row )
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{
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const rgb_t *palette = m_palette->palette()->entry_list_raw();
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UINT32 *p = &bitmap.pix32(y);
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UINT16 chr_base = ra;
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int i;
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if ( y == 0 ) MDA_LOG(1,"mda_lowres_text_blink_update_row",("\n"));
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for ( i = 0; i < x_count; i++ )
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{
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UINT16 offset = ( ( ma + i ) << 1 ) & 0x0FFF;
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UINT8 chr = m_videoram[ offset ];
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UINT8 attr = m_videoram[ offset + 1 ];
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UINT8 data = m_chr_gen[ (chr_base + chr * 16) << 1 ];
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UINT8 fg = ( attr & 0x08 ) ? 3 : 2;
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UINT8 bg = 0;
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if ( ( attr & ~0x88 ) == 0 )
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{
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data = 0x00;
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}
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switch( attr )
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{
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case 0x70:
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case 0xF0:
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bg = 2;
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fg = 0;
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break;
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case 0x78:
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case 0xF8:
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bg = 2;
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fg = 1;
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break;
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}
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if ( ( attr & 0x07 ) == 0x01 )
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{
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data = 0xFF;
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}
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if ( i == cursor_x )
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{
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if ( m_framecnt & 0x08 )
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{
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data = 0xFF;
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}
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}
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else
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{
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if ( ( attr & 0x80 ) && ( m_framecnt & 0x10 ) )
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{
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data = 0x00;
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}
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}
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*p = palette[( data & 0x80 ) ? fg : bg]; p++;
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*p = palette[( data & 0x40 ) ? fg : bg]; p++;
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*p = palette[( data & 0x20 ) ? fg : bg]; p++;
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*p = palette[( data & 0x10 ) ? fg : bg]; p++;
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*p = palette[( data & 0x08 ) ? fg : bg]; p++;
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*p = palette[( data & 0x04 ) ? fg : bg]; p++;
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*p = palette[( data & 0x02 ) ? fg : bg]; p++;
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*p = palette[( data & 0x01 ) ? fg : bg]; p++;
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}
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}
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WRITE8_MEMBER( isa8_ec1840_0002_device::mode_control_w )
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{
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m_mode_control = data;
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switch( m_mode_control & 0x2a )
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{
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case 0x08:
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m_update_row_type = MDA_LOWRES_TEXT_INTEN;
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break;
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case 0x28:
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m_update_row_type = MDA_LOWRES_TEXT_BLINK;
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break;
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default:
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m_update_row_type = -1;
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}
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}
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MC6845_UPDATE_ROW( isa8_ec1840_0002_device::crtc_update_row )
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{
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if (m_update_row_type == -1)
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return;
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switch (m_update_row_type)
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{
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case MDA_LOWRES_TEXT_INTEN:
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mda_lowres_text_inten_update_row(bitmap, cliprect, ma, ra, y, x_count, cursor_x, de, hbp, vbp);
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break;
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case MDA_LOWRES_TEXT_BLINK:
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mda_lowres_text_blink_update_row(bitmap, cliprect, ma, ra, y, x_count, cursor_x, de, hbp, vbp);
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break;
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}
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}
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@ -97,4 +97,34 @@ public:
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// device type definition
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extern const device_type ISA8_HERCULES;
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// ======================> isa8_ec1840_0002_device
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class isa8_ec1840_0002_device :
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public isa8_mda_device
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{
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public:
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// construction/destruction
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isa8_ec1840_0002_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
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// optional information overrides
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virtual machine_config_constructor device_mconfig_additions() const;
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virtual DECLARE_WRITE8_MEMBER(mode_control_w);
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virtual MC6845_UPDATE_ROW( crtc_update_row );
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MC6845_UPDATE_ROW( mda_lowres_text_inten_update_row );
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MC6845_UPDATE_ROW( mda_lowres_text_blink_update_row );
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protected:
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// device-level overrides
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virtual void device_start();
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virtual void device_reset();
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public:
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UINT8 *m_soft_chr_gen;
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};
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// device type definition
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extern const device_type ISA8_EC1840_0002;
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#endif /* __ISA_MDA_H__ */
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@ -8,7 +8,6 @@
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- memory bank size is smaller (128K)
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TODO (ec1841)
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- add chargen upload support for MDA
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- hard disk is connected but requires changes to isa_hdc.c
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***************************************************************************/
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@ -178,7 +177,6 @@ static ADDRESS_MAP_START( ec1841_map, AS_PROGRAM, 16, ec184x_state )
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AM_RANGE(0xa0000, 0xbffff) AM_NOP
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AM_RANGE(0xc0000, 0xc7fff) AM_ROM
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AM_RANGE(0xc8000, 0xcffff) AM_ROM
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AM_RANGE(0xdc000, 0xdffff) AM_RAM // monochrome chargen
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AM_RANGE(0xf0000, 0xfffff) AM_ROM
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ADDRESS_MAP_END
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