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-rw-r--r--src/mame/video/mikromik.c126
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