// license:BSD-3-Clause // copyright-holders:Curt Coder #include "includes/v1050.h" /* TODO: - bright in reverse video */ #define V1050_ATTR_BRIGHT 0x01 #define V1050_ATTR_BLINKING 0x02 #define V1050_ATTR_ATTEN 0x04 #define V1050_ATTR_REVERSE 0x10 #define V1050_ATTR_BLANK 0x20 #define V1050_ATTR_BOLD 0x40 #define V1050_ATTR_BLINK 0x80 /* Video RAM Access */ READ8_MEMBER( v1050_state::attr_r ) { return m_attr; } WRITE8_MEMBER( v1050_state::attr_w ) { m_attr = data; } READ8_MEMBER( v1050_state::videoram_r ) { if (offset >= 0x2000) { m_attr = (m_attr & 0xfc) | (m_attr_ram[offset] & 0x03); } return m_video_ram[offset]; } WRITE8_MEMBER( v1050_state::videoram_w ) { m_video_ram[offset] = data; if (offset >= 0x2000 && BIT(m_attr, 2)) { m_attr_ram[offset] = m_attr & 0x03; } } /* MC6845 Interface */ MC6845_UPDATE_ROW( v1050_state::crtc_update_row ) { int column, bit; for (column = 0; column < x_count; column++) { UINT16 address = (((ra & 0x03) + 1) << 13) | ((ma & 0x1fff) + column); UINT8 data = m_video_ram[address & V1050_VIDEORAM_MASK]; UINT8 attr = (m_attr & 0xfc) | (m_attr_ram[address] & 0x03); for (bit = 0; bit < 8; bit++) { int x = (column * 8) + bit; int color = BIT(data, 7); /* blinking */ if ((attr & V1050_ATTR_BLINKING) && !(attr & V1050_ATTR_BLINK)) color = 0; /* reverse video */ color ^= BIT(attr, 4); /* bright */ if (color && (!(attr & V1050_ATTR_BOLD) ^ (attr & V1050_ATTR_BRIGHT))) color = 2; /* display blank */ if (attr & V1050_ATTR_BLANK) color = 0; bitmap.pix32(vbp + y, hbp + x) = m_palette->pen(de ? color : 0); data <<= 1; } } } WRITE_LINE_MEMBER( v1050_state::crtc_vs_w ) { m_subcpu->set_input_line(INPUT_LINE_IRQ0, state ? ASSERT_LINE : CLEAR_LINE); set_interrupt(INT_VSYNC, state); } /* Video Start */ void v1050_state::video_start() { /* allocate memory */ m_attr_ram.allocate(V1050_VIDEORAM_SIZE); /* register for state saving */ save_item(NAME(m_attr)); } /* Machine Drivers */ MACHINE_CONFIG_FRAGMENT( v1050_video ) MCFG_MC6845_ADD(H46505_TAG, H46505, SCREEN_TAG, XTAL_15_36MHz/8) MCFG_MC6845_SHOW_BORDER_AREA(true) MCFG_MC6845_CHAR_WIDTH(8) MCFG_MC6845_UPDATE_ROW_CB(v1050_state, crtc_update_row) MCFG_MC6845_OUT_VSYNC_CB(WRITELINE(v1050_state, crtc_vs_w)) MCFG_SCREEN_ADD(SCREEN_TAG, RASTER) MCFG_SCREEN_UPDATE_DEVICE(H46505_TAG, h46505_device, screen_update) MCFG_SCREEN_REFRESH_RATE(60) MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) MCFG_SCREEN_SIZE(640, 400) MCFG_SCREEN_VISIBLE_AREA(0,640-1, 0, 400-1) MCFG_PALETTE_ADD_MONOCHROME_GREEN_HIGHLIGHT("palette") MACHINE_CONFIG_END