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-rw-r--r--src/devices/bus/isa/mda.cpp607
1 files changed, 560 insertions, 47 deletions
diff --git a/src/devices/bus/isa/mda.cpp b/src/devices/bus/isa/mda.cpp
index 823ff040676..f660b48a1dd 100644
--- a/src/devices/bus/isa/mda.cpp
+++ b/src/devices/bus/isa/mda.cpp
@@ -12,6 +12,31 @@
#include "screen.h"
+#define LOG_READ (1U << 1)
+#define LOG_SETUP (1U << 2)
+#define LOG_ROW (1U << 3)
+#define LOG_MODE (1U << 4)
+#define LOG_CHRG (1U << 5)
+#define LOG_STAT (1U << 6)
+
+//#define VERBOSE (LOG_MODE|LOG_SETUP|LOG_ROW)
+//#define LOG_OUTPUT_STREAM std::cout
+
+#include "logmacro.h"
+
+#define LOGR(...) LOGMASKED(LOG_READ, __VA_ARGS__)
+#define LOGSETUP(...) LOGMASKED(LOG_SETUP, __VA_ARGS__)
+#define LOGROW(...) LOGMASKED(LOG_ROW, __VA_ARGS__)
+#define LOGMODE(...) LOGMASKED(LOG_MODE, __VA_ARGS__)
+#define LOGCHRG(...) LOGMASKED(LOG_CHRG, __VA_ARGS__)
+#define LOGSTAT(...) LOGMASKED(LOG_STAT, __VA_ARGS__)
+
+#ifdef _MSC_VER
+#define FUNCNAME __func__
+#else
+#define FUNCNAME __PRETTY_FUNCTION__
+#endif
+
#define MDA_SCREEN_NAME "mda_screen"
#define MC6845_NAME "mc6845"
@@ -19,20 +44,7 @@
Hercules video card
*/
#define HERCULES_SCREEN_NAME "hercules_screen"
-
-#define VERBOSE_MDA 0 /* MDA (Monochrome Display Adapter) */
-
-#define MDA_CLOCK 16.257_MHz_XTAL
-
-#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)
+#define MDA_CLOCK XTAL(16'257'000)
static const unsigned char mda_palette[4][3] =
{
@@ -84,7 +96,7 @@ static GFXDECODE_START( gfx_pcmda )
GFXDECODE_END
-WRITE_LINE_MEMBER(isa8_mda_device::pc_cpu_line)
+WRITE_LINE_MEMBER( isa8_mda_device::pc_cpu_line )
{
m_isa->irq7_w(state);
}
@@ -211,7 +223,6 @@ void isa8_mda_device::device_reset()
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();
@@ -219,7 +230,7 @@ MC6845_UPDATE_ROW( isa8_mda_device::mda_text_inten_update_row )
uint16_t chr_base = ( ra & 0x08 ) ? 0x800 | ( ra & 0x07 ) : ra;
int i;
- if ( y == 0 ) MDA_LOG(1,"mda_text_inten_update_row",("\n"));
+ if ( y == 0 ) LOGROW("%11.6f: %-24s\n", machine().time().as_double(), FUNCNAME);
for ( i = 0; i < x_count; i++ )
{
uint16_t offset = ( ( ma + i ) << 1 ) & 0x0FFF;
@@ -292,7 +303,7 @@ MC6845_UPDATE_ROW( isa8_mda_device::mda_text_blink_update_row )
uint16_t chr_base = ( ra & 0x08 ) ? 0x800 | ( ra & 0x07 ) : ra;
int i;
- if ( y == 0 ) MDA_LOG(1,"mda_text_blink_update_row",("\n"));
+ if ( y == 0 ) LOGROW("%11.6f: %-24s\n", machine().time().as_double(), FUNCNAME);
for ( i = 0; i < x_count; i++ )
{
uint16_t offset = ( ( ma + i ) << 1 ) & 0x0FFF;
@@ -360,7 +371,6 @@ MC6845_UPDATE_ROW( isa8_mda_device::mda_text_blink_update_row )
}
}
-
MC6845_UPDATE_ROW( isa8_mda_device::crtc_update_row )
{
if (m_update_row_type == -1)
@@ -443,7 +453,7 @@ WRITE8_MEMBER( isa8_mda_device::mode_control_w )
* 2-1 reserved
* 0 horizontal drive enable
*/
-READ8_MEMBER( isa8_mda_device::status_r)
+READ8_MEMBER( isa8_mda_device::status_r )
{
// Faking pixel stream here
m_pixel++;
@@ -458,42 +468,42 @@ READ8_MEMBER( isa8_mda_device::status_r)
* monochrome display adapter
*
*************************************************************************/
-WRITE8_MEMBER( isa8_mda_device::io_write)
+WRITE8_MEMBER( isa8_mda_device::io_write )
{
switch( offset )
{
- case 0: case 2: case 4: case 6:
+ case 0x00: case 0x02: case 0x04: case 0x06:
m_crtc->address_w(data);
break;
- case 1: case 3: case 5: case 7:
+ case 0x01: case 0x03: case 0x05: case 0x07:
m_crtc->register_w(data);
break;
- case 8:
+ case 0x08:
mode_control_w(space, offset, data);
break;
- case 12: case 13: case 14:
- m_lpt->write(space, offset - 12, data);
+ case 0x0c: case 0x0d: case 0x0e:
+ m_lpt->write(space, offset - 0x0c, data);
break;
}
}
-READ8_MEMBER( isa8_mda_device::io_read)
+READ8_MEMBER( isa8_mda_device::io_read )
{
int data = 0xff;
switch( offset )
{
- case 0: case 2: case 4: case 6:
+ case 0x00: case 0x02: case 0x04: case 0x06:
/* return last written mc6845 address value here? */
break;
- case 1: case 3: case 5: case 7:
+ case 0x01: case 0x03: case 0x05: case 0x07:
data = m_crtc->register_r();
break;
- case 10:
+ case 0x0a:
data = status_r(space, offset);
break;
- /* 12, 13, 14 are the LPT ports */
- case 12: case 13: case 14:
- data = m_lpt->read(space, offset - 12);
+ /* LPT ports */
+ case 0x0c: case 0x0d: case 0x0e:
+ data = m_lpt->read(space, offset - 0x0c);
break;
}
return data;
@@ -624,7 +634,7 @@ MC6845_UPDATE_ROW( isa8_hercules_device::hercules_gfx_update_row )
uint32_t *p = &bitmap.pix32(y);
uint16_t gfx_base = ( ( m_mode_control & 0x80 ) ? 0x8000 : 0x0000 ) | ( ( ra & 0x03 ) << 13 );
int i;
- if ( y == 0 ) MDA_LOG(1,"hercules_gfx_update_row",("\n"));
+ if ( y == 0 ) LOGROW("%11.6f: %-24s\n", machine().time().as_double(), FUNCNAME);
for ( i = 0; i < x_count; i++ )
{
uint8_t data = m_videoram[ gfx_base + ( ( ma + i ) << 1 ) ];
@@ -681,19 +691,19 @@ WRITE8_MEMBER( isa8_hercules_device::io_write )
{
switch( offset )
{
- case 0: case 2: case 4: case 6:
+ case 0x00: case 0x02: case 0x04: case 0x06:
m_crtc->address_w(data);
break;
- case 1: case 3: case 5: case 7:
+ case 0x01: case 0x03: case 0x05: case 0x07:
m_crtc->register_w(data);
break;
- case 8:
+ case 0x08:
mode_control_w(space, offset, data);
break;
- case 12: case 13: case 14:
+ case 0x0c: case 0x0d: case 0x0e:
m_lpt->write(space, offset - 12, data);
break;
- case 15:
+ case 0x0f:
m_configuration_switch = data;
break;
}
@@ -725,18 +735,18 @@ READ8_MEMBER( isa8_hercules_device::io_read )
int data = 0xff;
switch( offset )
{
- case 0: case 2: case 4: case 6:
+ case 0x00: case 0x02: case 0x04: case 0x06:
/* return last written mc6845 address value here? */
break;
- case 1: case 3: case 5: case 7:
+ case 0x01: case 0x03: case 0x05: case 0x07:
data = m_crtc->register_r();
break;
- case 10:
+ case 0x0a:
data = status_r(space, offset);
break;
- /* 12, 13, 14 are the LPT ports */
- case 12: case 13: case 14:
- data = m_lpt->read(space, offset - 12);
+ /* LPT ports */
+ case 0xc: case 0xd: case 0xe:
+ data = m_lpt->read(space, offset - 0x0c);
break;
}
return data;
@@ -809,7 +819,7 @@ MC6845_UPDATE_ROW( isa8_ec1840_0002_device::mda_lowres_text_inten_update_row )
uint16_t chr_base = ra;
int i;
- if ( y == 0 ) MDA_LOG(1,"mda_lowres_text_inten_update_row",("\n"));
+ if ( y == 0 ) LOGROW("%11.6f: %-24s\n", machine().time().as_double(), FUNCNAME);
for ( i = 0; i < x_count; i++ )
{
uint16_t offset = ( ( ma + i ) << 1 ) & 0x0FFF;
@@ -873,7 +883,7 @@ MC6845_UPDATE_ROW( isa8_ec1840_0002_device::mda_lowres_text_blink_update_row )
uint16_t chr_base = ra;
int i;
- if ( y == 0 ) MDA_LOG(1,"mda_lowres_text_blink_update_row",("\n"));
+ if ( y == 0 ) LOGROW("%11.6f: %-24s\n", machine().time().as_double(), FUNCNAME);
for ( i = 0; i < x_count; i++ )
{
uint16_t offset = ( ( ma + i ) << 1 ) & 0x0FFF;
@@ -965,3 +975,506 @@ MC6845_UPDATE_ROW( isa8_ec1840_0002_device::crtc_update_row )
break;
}
}
+
+/*****************************************************************************
+
+ Ericsson PC Monochrome HR Graphics Board 1070
+
+******************************************************************************/
+
+/* PCB layouts and assembly years from online pictures and physical unit.
+ Ericsson - marked SPVT02 8301 60 53-10, assembled in 1985 indicated by chip dates
+ +--------------------------------------------------------------------------------------+ ___
+ | IC1 IC2 IC3 IC4 IC5 +-IC15--EPROM-+ IC6 IC7 IC8 S1 ||
+ | |8363 65 14-80| ||
+ | IC9 IC10 IC11 IC12 IC13 IC14|CG 50821 A64 |+------------------++-IC24 EPROM--+ ||
+ | +-------------+| CRTC HD46505SP-1 ||10-40VP | ||
+ | IC16 IC17 IC18 IC19 IC20 IC21 IC22 | IC23 HD68A45SP ||402 28 A19 | J4|| not
+ | +------------------++-------------+ || mounted
+ | IC25 IC26 IC27 IC28 IC29 IC30 IC31 IC32 IC33 IC34 ||
+ | O-|__
+ | IC35 IC36 IC37 IC38 IC39 IC40 IC41 IC42 IC43 IC44 || |
+ | ||DB15
+ | IC45 IC46 IC47 IC48 IC49 IC50 IC51 IC52 IC53 IC54 || |
+ | ||__|
+ | IC55 IC56 IC57 IC58 IC59 IC60 IC61 IC62 IC63 IC64 O-|
+ | J1A ||
+ | IC65 IC66 IC67 IC68 IC69 IC70 IC71 IC72 +--------------------------------------------+|
+ +-----------------------------------------+ ||||||||| ||||||||||||||||||||||||| |
+ I85565 A85571 (labels) |
+ |
+
+ IC's (from photos)
+ ------------------------------------------------------------------------------
+ IC1 74F109 IC26 74F86 IC51 TMS4416-15NL 4 x 16Kbits DRAM
+ IC2 74LS393 IC27 74LS08 IC52 74ALS574
+ IC3 74F64 IC28 74F153 IC53 74LS138
+ IC4 74ALS299 IC29 74LS174 IC54 74F86
+ IC5 74LS375 IC30 74LS374 IC55 74F109
+ IC6 74LS151 IC31 74LS374 IC56 74F32
+ IC7 74LS153 IC32 74ALS574 IC57 74F109
+ IC8 74LS389? IC33 74LS08 IC58 74F00?
+ IC9 74F02 IC34 74LS245 IC59 74LS244
+ IC10 74ALS109 IC35 74F10? IC60 TMS4416-15NL 4 x 16Kbits DRAM
+ IC11 Crystal 17.040MHz IC36 74LS02 IC61 TMS4416-15NL 4 x 16Kbits DRAM
+ IC12 74F64 IC37 74LS00 IC62 74ALS574
+ IC13 74ALS299 IC38 74F374 IC63 74LS138
+ IC14 PAL? 10-70ART40101 IC39 74LS125 IC64 74LS245
+ IC15 EPROM 8363 65 14-80 CG 50821 A64 IC40 74LS244 IC65 74LS00
+ IC16 Crystal 19.170MHz IC41 74LS244 IC66 74LS02
+ IC17 74LS10 IC42 74LS574 IC67 74LS51
+ IC18 74F08 IC43 74LS32 IC68 74LS04
+ IC19 74ALS574 IC44 MC10124 - TTL to MECL converter IC69 74LS153
+ IC20 74LS299 IC45 74LS109 IC70 74LS109
+ IC21 74LS273 IC46 74LS00 IC71 74LS138
+ IC22 74ALS574 IC47 74F194 IC72 74LS139
+ IC23 CRTC HD46505SP,HD68A45SP IC48 74F04
+ IC24 EPROM 2764, 10-40 VP 402 28 A19 IC49 74LS174
+ IC25 74ALS109 IC50 TMS4416-15NL 4 x 16Kbits DRAM
+
+ General description
+ -------------------
+ The PCB has a 2 bit DIP switch S1 and a DB15 non standard video connector. There is also an unsoldered J4 connector
+ above the DB15 but no hole prepared for a connector in the plate. Above the J4 connector there is a two pin PCB connector
+ that probably receives the power for the monitor for the DB15 from the PSU.
+
+ Just below IC65 and IC66 there are two labels saying "I 85565" and "A E85571" respectively
+
+ Video cable, card DB15 <---> monitor DB25
+ ---------------------------------------------------
+ Ericsson 2 +VS 4 Ericsson
+ Monochrome 3 VS return 2 Monochrome HR
+ HR Graphics 10 +VS 17 Monitors 3111 (Amber) or
+ Board 1070 11 VS return 15 3712/3715 (Black & White)
+ 4 VSYNC 6
+ 12 VSYNC 19
+ 5 HSYNC 7
+ 13 HSYNC 20
+ 6 High intensity 8
+ 14 High intensity 21
+ 7 Video 9
+ 15 Video 22
+ 8 GND 11
+
+ This board is normaly used with an Ericsson monitor due to the non standard connector.
+ Trivia: https://www.pinterest.se/pin/203084264425177097/
+ */
+
+#define EPC_MDA_SCREEN "epc_mda_screen" // TODO: use a device finder reference instead
+
+ROM_START( epc )
+ ROM_REGION(0x2000,"chargen", 0)
+ ROM_LOAD("8363_65_14_80_cg_50821_a64.bin", 0x00000, 0x2000, CRC(be709786) SHA1(38ab26224bbe66bbe2bb2ccac29b41cbf78bdbf8))
+ //ROM_LOAD("10_40_vp_402_28_ic_24_a19.bin", 0x00000, 0x2000, CRC(2aa53b92) SHA1(87051a037249eb631d7d2191bc0e925125c60f39))
+ROM_END
+
+//**************************************************************************
+// GLOBAL VARIABLES
+//**************************************************************************
+DEFINE_DEVICE_TYPE(ISA8_EPC_MDA, isa8_epc_mda_device, "isa_epc_mda", "Ericsson PC Monochrome HR Graphics Board 1070")
+
+
+//-------------------------------------------------
+// device_add_mconfig - add device configuration
+//-------------------------------------------------
+/* There are two crystals on the board: 19.170Mhz and 17.040MHz TODO: verify use */
+/* Text modes uses 720x400 base resolution and the Graphics modes 320/640x200/400 */
+/* This matches the difference between the crystals so we assume this for now */
+void isa8_epc_mda_device::device_add_mconfig(machine_config &config)
+{
+ screen_device &screen(SCREEN(config, EPC_MDA_SCREEN, SCREEN_TYPE_RASTER));
+ screen.set_raw(XTAL(19'170'000) / 4, 720, 0, 720, 400, 0, 400);
+ //screen.set_screen_update(MC6845_NAME, FUNC(h46505_device::screen_update));
+ screen.set_screen_update(MC6845_NAME, FUNC(mc6845_device::screen_update));
+
+ PALETTE(config, m_palette).set_entries(4);
+
+ HD6845S(config, m_crtc, XTAL(19'170'000) / 16); // clock and divider are guesswork
+ m_crtc->set_screen(EPC_MDA_SCREEN);
+ m_crtc->set_show_border_area(false);
+ m_crtc->set_char_width(8);
+
+ m_crtc->set_update_row_callback(FUNC(isa8_epc_mda_device::crtc_update_row), this);
+ m_crtc->out_hsync_callback().set(FUNC(isa8_epc_mda_device::hsync_changed));
+ m_crtc->out_vsync_callback().set(FUNC(isa8_epc_mda_device::vsync_changed));
+
+ //MCFG_GFXDECODE_ADD("gfxdecode", "palette", pcepc)
+}
+
+//-------------------------------------------------
+// rom_region - device-specific ROM region
+//-------------------------------------------------
+
+const tiny_rom_entry *isa8_epc_mda_device::device_rom_region() const
+{
+ return ROM_NAME( epc );
+}
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// isa8_epc_mda_device - constructor
+//-------------------------------------------------
+
+isa8_epc_mda_device::isa8_epc_mda_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+ isa8_mda_device(mconfig, ISA8_EPC_MDA, tag, owner, clock),
+ m_soft_chr_gen(nullptr),
+ m_s1(*this, "S1"),
+ m_color_mode(0),
+ m_mode_control2(0),
+ m_screen(*this, EPC_MDA_SCREEN),
+ m_io_monitor(*this, "MONITOR"),
+ m_chargen(*this, "chargen"),
+ m_installed(false)
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void isa8_epc_mda_device::device_start()
+{
+ if (m_palette != nullptr && !m_palette->started())
+ throw device_missing_dependencies();
+
+ /* Palette for use with the Ericsson Amber Monochrome HR CRT monitor 3111, P3 phospor 602nm 255,183, 0 */
+ m_3111_pal[0] = rgb_t( 0, 0, 0); // black
+ m_3111_pal[1] = rgb_t( 143, 103, 0); // dim
+ m_3111_pal[2] = rgb_t( 191, 137, 0); // normal
+ m_3111_pal[3] = rgb_t( 255, 183, 0); // bright
+
+ /* Palette for use with the Ericsson B&W Monochrome HR CRT monitor 3712/3715 */
+ m_371x_pal[0] = rgb_t( 0, 0, 0); // black
+ m_371x_pal[1] = rgb_t( 143, 143, 143); // dim
+ m_371x_pal[2] = rgb_t( 191, 191, 191); // normal
+ m_371x_pal[3] = rgb_t( 255, 255, 255); // bright
+
+ /* Init a default palette */
+ m_pal = &m_3111_pal; // In case screen starts rendering before device_reset where we read the settings
+
+ m_videoram.resize(0x8000);
+ set_isa_device();
+ m_installed = false;
+ m_hd6845s = subdevice<hd6845s_device>(MC6845_NAME);
+}
+
+void isa8_epc_mda_device::device_reset()
+{
+ m_framecnt = 0;
+ m_mode_control = 0;
+ m_vsync = 0;
+ m_hsync = 0;
+
+ m_color_mode = m_s1->read();
+ LOGSETUP("%s: m_color_mode:%02x\n", FUNCNAME, m_color_mode);
+ m_pal = (m_io_monitor-> read() & 1) == 1 ? &m_371x_pal : &m_3111_pal;
+ m_vmode = 0;
+
+ if (m_installed == false)
+ {
+ m_isa->install_device(0x3b0, 0x3bf, read8_delegate( FUNC(isa8_epc_mda_device::io_read), this ), write8_delegate( FUNC(isa8_epc_mda_device::io_write), this ) );
+ m_isa->install_bank(0xb0000, 0xb7fff, "bank_epc", &m_videoram[0]); // Monochrome emulation mode VRAM address
+
+ // This check allows a color monitor adapter to be installed at this address range if color emulation is disabled
+ if (m_color_mode & 1)
+ {
+ m_isa->install_device(0x3d0, 0x3df, read8_delegate( FUNC(isa8_epc_mda_device::io_read), this ), write8_delegate( FUNC(isa8_epc_mda_device::io_write), this ) );
+ m_isa->install_bank(0xb8000, 0xbffff, "bank_epc", &m_videoram[0]); // Color emulation mode VRAM address, but same 32KB areas as there are only this amount on the board
+ }
+ m_installed = true;
+ }
+}
+
+/*
+ * Register Address table from the manual
+ * Ericsson name MDA mode CGA mode Standard name
+ *-------------------------------------------------------------------------------
+ * 6845 Address Registers 0x3b4 0x3d4 wo CRT Index reg
+ * 6845 Data Registers 0x3b5 0x3d5 wo CRT Data reg
+ * Mode Register 1 0x3b8 0x3d8 rw MDA/CGA mode reg (bit 0,1 & 4 incompatible)
+ * Mode Register 2 0x3bf 0x3df rw CRT/CPU page reg (incompatible w PCjr only)
+ * Status Register 0x3ba 0x3da r CGA/MDA status reg (incompatible)
+ * w EGA/VGA feature ccontrol reg (not used by this board)
+ */
+WRITE8_MEMBER(isa8_epc_mda_device::io_write )
+{
+ LOG("%s: %04x <- %02x\n", FUNCNAME, offset, data);
+ switch( offset )
+ {
+ case 0x04:
+ //LOGSETUP(" - HD6845S address write\n");
+ m_hd6845s->address_w( data );
+ break;
+ case 0x05:
+ //LOGSETUP(" - HD6845S register write\n");
+ m_hd6845s->register_w( data );
+ break;
+ case 0x08: // Mode 1 reg
+ LOGMODE(" - Mode register 1 write: %02x\n", data);
+ LOGMODE(" MSB attribute: %s\n", (data & 0x20) == 0 ? "intensity" : "blink");
+ LOGMODE(" Horizontal px: %s\n", (data & 0x10) == 0 ? "320/LR" : "640/HR");
+ LOGMODE(" Video : %s\n", (data & 0x08) == 0 ? "Disabled" : "Enabled");
+ LOGMODE(" Mode : %s\n", (data & 0x02) == 0 ? "Text" : "Graphics");
+ LOGMODE(" Text columns : %d\n", (data & 0x01) == 0 ? 40 : 80);
+ m_mode_control = data;
+ m_vmode &= ~(VM_GRAPH | VM_COLS80 | VM_HOR640);
+ m_vmode |= ((m_mode_control & 0x01) ? VM_COLS80 : 0);
+ m_vmode |= ((m_mode_control & 0x02) ? VM_GRAPH : 0);
+ m_vmode |= ((m_mode_control & 0x10) ? VM_HOR640 : 0);
+ m_update_row_type = ((data & 0x20) == 0 ? MDA_LOWRES_TEXT_INTEN : MDA_LOWRES_TEXT_BLINK);
+ {
+ rectangle rect(0, get_xres() - 1, 0, get_yres() -1);
+ m_screen->configure(get_xres(), get_yres(), rect, HZ_TO_ATTOSECONDS(50));
+ }
+ LOGMODE("Video Mode:%02x\n\n", m_vmode);
+ break;
+ case 0x0f: // Mode 2 reg
+ LOGMODE(" - Mode register 2 write: %02x\n", data);
+ LOGMODE(" Vertical px : %s\n", (data & MR2_VER400) == 0 ? "200" : "400");
+ LOGMODE(" Character set: %s\n", (data & MR2_CHRSET) == 0 ? "0" : "1");
+ LOGMODE(" Emulated : %s\n", (data & MR2_COLEMU) == 0 ? "Color" : "Monochrome");
+ m_mode_control2 = data;
+ m_vmode &= ~(VM_MONO | VM_VER400);
+ m_vmode |= ((m_mode_control2 & 0x04) ? VM_MONO : 0);
+ m_vmode |= ((m_mode_control2 & 0x80) ? VM_VER400 : 0);
+ {
+ rectangle rect(0, get_xres() - 1, 0, get_yres() -1);
+ m_screen->configure(get_xres(), get_yres(), rect, HZ_TO_ATTOSECONDS(50));
+ }
+ LOGMODE("Video Mode:%02x\n\n", m_vmode);
+ break;
+ default:
+ LOG("EPC MDA: io_write at wrong offset:%02x\n", offset);
+ }
+}
+
+READ8_MEMBER( isa8_epc_mda_device::io_read )
+{
+ LOG("%s: %04x <- ???\n", FUNCNAME, offset);
+ int data = 0xff;
+ switch( offset )
+ {
+ case 0x04:
+ LOGR(" - hd6845s address read\n");
+ break;
+ case 0x05:
+ LOGR(" - hd6845s register read\n");
+ data = m_hd6845s->register_r();
+ break;
+ case 0x08: // Mode 1 reg
+ data = m_mode_control;
+ LOGMODE(" - Mode register 1 read: %02x\n", data);
+ break;
+ case 0x0a: // Status reg: b7-6=00 board ID; b3 vert retrace; b0 horiz retrace; b5,4,2,1 unused
+ data = (m_vsync != 0 ? 0x08 : 0x00) | (m_hsync != 0 ? 0x01 : 0x00);
+ LOGSTAT(" - Status register read: %02x\n", data);
+ break;
+ case 0x0f: // Mode 2 reg
+ data = m_mode_control2;
+ LOGMODE(" - Mode register 2 read: %02x\n", data);
+ break;
+ default:
+ LOG("EPC MDA: io_read at wrong offset:%02x\n", offset);
+ logerror("EPC MDA: io_read at wrong offset:%02x\n", offset);
+ }
+ LOG(" !!!: %04x <- %02x\n", offset, data);
+ return data;
+}
+
+inline int isa8_epc_mda_device::get_xres()
+{
+ return (m_vmode & VM_GRAPH) ? ( (m_vmode & VM_HOR640) ? 640 : 320 ) : 720;
+}
+
+inline int isa8_epc_mda_device::get_yres()
+{
+ return (m_vmode & VM_GRAPH) ? ( (m_vmode & VM_VER400) ? 400 : 200 ) : 400;
+}
+
+MC6845_UPDATE_ROW(isa8_epc_mda_device::crtc_update_row)
+{
+ uint32_t *p = &bitmap.pix32(y);
+ uint16_t chr_base = ra;
+ int i;
+
+ // Get som debug data from a couple of rows now and then
+ if ( y < (16 * 0 + 0x20) && (m_framecnt & 0xff) == 0 )
+ {
+ LOGROW("%11.6f %s\n - y:%d chr_base:%d ra:%d ma:%d x_count:%d\n", machine().time().as_double(), FUNCNAME,
+ y, y % 16, ra, ma, x_count);
+ }
+
+ // Video Off handling
+ if ((m_mode_control & MR1_VIDEO) == 0)
+ {
+ for (int i = 0; i < get_xres(); i++)
+ {
+ bitmap.pix32(y, i) = rgb_t::black();
+ }
+ }
+
+ // Graphic modes using only pixeldata, soft fonts are 8x8 or 8x16 but this is transparant to the code
+ else if ((m_vmode & VM_GRAPH) != 0)
+ {
+ logerror("EPC MDA: graphic modes not supported yet\n");
+ }
+
+ // Text modes using one of two 9x16 fonts in character rom
+ else
+ {
+ // Adjust row pointer if in monochrome text mode as we insert two scanlines per row of characters (see below)
+ if (m_vmode & VM_MONO)
+ {
+ p = &bitmap.pix32((y / 14) * 16 + y % 14);
+ }
+
+ // Loop over each character in a row
+ for ( i = 0; i < x_count; i++ )
+ {
+ uint16_t offset = ( ( ma + i ) << 1 ) & 0x0FFF;
+ uint8_t chr = m_videoram[ offset ];
+ uint8_t attr = m_videoram[ offset + 1 ];
+ uint8_t data = m_chargen[ ((m_mode_control2 & MR2_CHRSET) ? 0x1000 : 0) + chr_base + chr * 16];
+
+ // Default to light text on dark background
+ uint8_t fg = 2;
+ uint8_t bg = 0;
+
+ if (y == 0 && i == 0) LOGCHRG(" - Offset: %04x Chr: '%c'[%02x] Attr: %02x Chr_base: %04x\n", offset, chr, chr, attr, chr_base);
+
+ // Prepare some special monochrome emulation cases
+ if ( m_vmode & VM_MONO)
+ {
+ // Handle invisible characters
+ if ( (attr & (ATTR_FOREG | ATTR_BACKG)) == 0 )
+ {
+ data = 0x00;
+ }
+ // Handle reversed characters
+ else if ( (attr & (ATTR_BACKG)) == ATTR_BACKG )
+ {
+ fg = 0;
+ bg = 2;
+ }
+ }
+ else // prepare some special color emulation cases
+ {
+ // Handle invisible characters
+ if ( (attr & (ATTR_FOREG)) == ((attr & ATTR_BACKG) >> 4))
+ {
+ data = 0x00;
+ }
+ // Handle reversed characters
+ else if ( (attr & ATTR_BACKG) == ATTR_BACKG ||
+ (attr & ATTR_FOREG) == 0 )
+ {
+ fg = 0;
+ bg = 2;
+ }
+ }
+
+ // Handle intense foreground
+ if ((attr & ATTR_INTEN) != 0 && fg == 2)
+ {
+ fg = 3;
+ }
+
+ // Handle intense background if blinking is disabled
+ if ((m_mode_control & MR1_BLINK) == 0 &&
+ (attr & ATTR_BLINK) != 0 && bg == 2)
+ {
+ bg = 3;
+ }
+
+ // Handle cursor and blinks
+ if ( i == (cursor_x))
+ {
+ if ( m_framecnt & 0x08 )
+ {
+ data = 0xFF;
+ }
+ }
+ else
+ {
+ if ( (m_mode_control & MR1_BLINK) &&
+ ( attr & ATTR_BLINK ) && ( m_framecnt & 0x10 ) )
+ {
+ data = 0x00;
+ }
+ }
+
+ *p = (*m_pal)[( data & 0x80 ) ? fg : bg]; p++;
+ *p = (*m_pal)[( data & 0x40 ) ? fg : bg]; p++;
+ *p = (*m_pal)[( data & 0x20 ) ? fg : bg]; p++;
+ *p = (*m_pal)[( data & 0x10 ) ? fg : bg]; p++;
+ *p = (*m_pal)[( data & 0x08 ) ? fg : bg]; p++;
+ *p = (*m_pal)[( data & 0x04 ) ? fg : bg]; p++;
+ *p = (*m_pal)[( data & 0x02 ) ? fg : bg]; p++;
+ *p = (*m_pal)[( data & 0x01 ) ? fg : bg]; p++;
+ if (chr >= 0xc0 && chr <= 0xdf)
+ *p = (*m_pal)[( data & 0x01 ) ? fg : bg]; // 9th pixel col is a copy of col 8
+ else
+ *p = (*m_pal)[bg]; // 9th pixel col is just background
+ p++;
+
+ // Insert two extra scanlines in monochrome text mode to get 400 lines and support underline, needs verification on actual hardware.
+ // The technical manual says that the character box is 9x16 pixels in 80x25 character mode which equals 720x400 resolution but the
+ // CRTC calls back for only 350 lines. Assumption is that there is hardware adding these lines and that handles underlining. In color
+ // emulation text mode all 400 lines are called for in 80x25 and this mode does not support underlining according to the technical manual
+ if ( ra == 13 && (m_vmode & VM_MONO) )
+ {
+ uint16_t row = ra + (y / 14) * 16; // Calculate correct row number including the extra 2 lines per each row of characters
+ for ( int j = 0; j < 9; j++)
+ {
+ if (chr >= 0xb3 && chr <= 0xdf) // Handle the meta graphics characters
+ {
+ bitmap.pix32(row + 1, j + i * 9) = (*m_pal)[( data & (0x80 >> j) ) || (j == 8 && (data & 0x01)) ? fg : bg];
+ bitmap.pix32(row + 2, j + i * 9) = (*m_pal)[( data & (0x80 >> j) ) || (j == 8 && (data & 0x01)) ? fg : bg];
+ }
+ else
+ {
+ // Handle underline
+ bitmap.pix32(row + 1, j + i * 9) =(*m_pal)[( attr & ATTR_FOREG ) == ATTR_ULINE ? fg : bg];
+ bitmap.pix32(row + 2, j + i * 9) = (*m_pal)[bg];
+ }
+ }
+ }
+ }
+ }
+}
+
+//--------------------------------------------------------------------
+// Port definitions
+//--------------------------------------------------------------------
+static INPUT_PORTS_START( epc_mda )
+ PORT_START( "S1" )
+ PORT_DIPNAME( 0x01, 0x00, "Color emulation") PORT_DIPLOCATION("S1:1")
+ PORT_DIPSETTING( 0x00, "Disabled" )
+ PORT_DIPSETTING( 0x01, "Enabled" )
+ PORT_DIPUNUSED_DIPLOC(0x02, 0x02, "S1:2")
+
+ PORT_START( "MONITOR" )
+ PORT_CONFNAME( 0x01, 0x00, "Ericsson Monochrome HR Monitors") PORT_CHANGED_MEMBER( DEVICE_SELF, isa8_epc_mda_device, monitor_changed, 0 )
+ PORT_CONFSETTING( 0x00, "Amber 3111")
+ PORT_CONFSETTING( 0x01, "B&W 3712/3715")
+INPUT_PORTS_END
+
+INPUT_CHANGED_MEMBER( isa8_epc_mda_device::monitor_changed )
+{
+ if ((m_io_monitor->read() & 1) == 1)
+ {
+ m_pal = &m_371x_pal;
+ }
+ else
+ {
+ m_pal = &m_3111_pal;
+ }
+}
+
+ioport_constructor isa8_epc_mda_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME( epc_mda );
+}