diff options
Diffstat (limited to 'src/mame/video/mikromik.c')
-rw-r--r-- | src/mame/video/mikromik.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/src/mame/video/mikromik.c b/src/mame/video/mikromik.c new file mode 100644 index 00000000000..e107a3c4421 --- /dev/null +++ b/src/mame/video/mikromik.c @@ -0,0 +1,126 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +#include "includes/mikromik.h" + + + +//------------------------------------------------- +// i8275 crtc display pixels +//------------------------------------------------- + +I8275_DRAW_CHARACTER_MEMBER( mm1_state::crtc_display_pixels ) +{ + UINT8 romdata = m_char_rom->base()[(charcode << 4) | linecount]; + + int d0 = BIT(romdata, 0); + int d7 = BIT(romdata, 7); + int gpa0 = BIT(gpa, 0); + int llen = m_llen; + int i; + + UINT8 data = (romdata << 1) | (d7 & d0); + + for (i = 0; i < 8; i++) + { + int qh = BIT(data, i); + int video_in = ((((d7 & llen) | !vsp) & !gpa0) & qh) | lten; + int compl_in = rvv; + int hlt_in = hlgt; + + int color = hlt_in ? 2 : (video_in ^ compl_in); + + bitmap.pix32(y, x + i) = m_palette->pen(color); + } +} + + +//------------------------------------------------- +// ADDRESS_MAP( mm1_upd7220_map ) +//------------------------------------------------- + +static ADDRESS_MAP_START( mm1_upd7220_map, AS_0, 16, mm1_state ) + ADDRESS_MAP_GLOBAL_MASK(0x7fff) + AM_RANGE(0x0000, 0x7fff) AM_RAM AM_SHARE("video_ram") +ADDRESS_MAP_END + + +//------------------------------------------------- +// UPD7220_INTERFACE( hgdc_intf ) +//------------------------------------------------- + +UPD7220_DISPLAY_PIXELS_MEMBER( mm1_state::hgdc_display_pixels ) +{ + UINT16 data = m_video_ram[address >> 1]; + + for (int i = 0; i < 16; i++) + { + if (BIT(data, i)) bitmap.pix32(y, x + i) = m_palette->pen(1); + } +} + + +UINT32 mm1_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect) +{ + /* text */ + m_crtc->screen_update(screen, bitmap, cliprect); + + /* graphics */ + m_hgdc->screen_update(screen, bitmap, cliprect); + + return 0; +} + + +//------------------------------------------------- +// gfx_layout charlayout +//------------------------------------------------- + +static const gfx_layout charlayout = +{ + 8, 16, + RGN_FRAC(1,1), + 1, + { 0 }, + { 7, 6, 5, 4, 3, 2, 1, 0 }, + { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, + 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8 }, + 8*16 +}; + + +//------------------------------------------------- +// GFXDECODE( mm1 ) +//------------------------------------------------- + +static GFXDECODE_START( mm1 ) + GFXDECODE_ENTRY( "chargen", 0, charlayout, 0, 1 ) +GFXDECODE_END + + +//------------------------------------------------- +// MACHINE_CONFIG_FRAGMENT( mm1m6_video ) +//------------------------------------------------- + +MACHINE_CONFIG_FRAGMENT( mm1m6_video ) + MCFG_SCREEN_ADD( SCREEN_TAG, RASTER ) + MCFG_SCREEN_REFRESH_RATE( 50 ) + MCFG_SCREEN_UPDATE_DRIVER(mm1_state, screen_update) + MCFG_SCREEN_SIZE( 800, 400 ) + MCFG_SCREEN_VISIBLE_AREA( 0, 800-1, 0, 400-1 ) + //MCFG_SCREEN_RAW_PARAMS(XTAL_18_720MHz, ...) + + MCFG_GFXDECODE_ADD("gfxdecode", "palette", mm1) + MCFG_PALETTE_ADD_MONOCHROME_GREEN_HIGHLIGHT("palette") + + MCFG_DEVICE_ADD(I8275_TAG, I8275, XTAL_18_720MHz/8) + MCFG_I8275_CHARACTER_WIDTH(8) + MCFG_I8275_DRAW_CHARACTER_CALLBACK_OWNER(mm1_state, crtc_display_pixels) + MCFG_I8275_DRQ_CALLBACK(DEVWRITELINE(I8237_TAG, am9517a_device, dreq0_w)) + MCFG_I8275_VRTC_CALLBACK(DEVWRITELINE(UPD7220_TAG, upd7220_device, ext_sync_w)) + MCFG_VIDEO_SET_SCREEN(SCREEN_TAG) + + MCFG_DEVICE_ADD(UPD7220_TAG, UPD7220, XTAL_18_720MHz/8) + MCFG_DEVICE_ADDRESS_MAP(AS_0, mm1_upd7220_map) + MCFG_UPD7220_DISPLAY_PIXELS_CALLBACK_OWNER(mm1_state, hgdc_display_pixels) + MCFG_VIDEO_SET_SCREEN(SCREEN_TAG) +MACHINE_CONFIG_END |