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mame/src/mess/drivers/zrt80.c
Angelo Salese 34372f03c7 Added a preliminary boolean flag to MC6845 interface structure: "show border area". If true, it will show the whole video area including border + blanking areas. [Angelo Salese] 
Bulk replaced const mc6845_interface -> MC6845_INTERFACE, nw

(MESS)
SMC-777: enabled to show the border area in MC6845 interface, changed various video related function accordingly [Angelo Salese]
2013-01-14 22:02:06 +00:00

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/***************************************************************************
DEC ZRT-80
12/05/2009 Skeleton driver.
16/02/2011 Working.
The beeper is external, frequency not known. I've made a reasonable
assumption of frequency and lengths.
Make sure 'mode' dipswitch is set to 'local' so you can see your
typing.
****************************************************************************/
#include "emu.h"
#include "cpu/z80/z80.h"
#include "video/mc6845.h"
#include "machine/ins8250.h"
#include "machine/keyboard.h"
#include "sound/beep.h"
class zrt80_state : public driver_device
{
public:
zrt80_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag),
m_maincpu(*this, "maincpu"),
m_crtc(*this, "crtc"),
m_8250(*this, "ins8250"),
m_beep(*this, BEEPER_TAG),
m_p_videoram(*this, "videoram"){ }
required_device<cpu_device> m_maincpu;
required_device<mc6845_device> m_crtc;
required_device<ins8250_device> m_8250;
required_device<beep_device> m_beep;
DECLARE_READ8_MEMBER(zrt80_10_r);
DECLARE_WRITE8_MEMBER(zrt80_30_w);
DECLARE_WRITE8_MEMBER(zrt80_38_w);
DECLARE_WRITE8_MEMBER(kbd_put);
UINT8 m_term_data;
required_shared_ptr<const UINT8> m_p_videoram;
const UINT8 *m_p_chargen;
virtual void machine_reset();
virtual void video_start();
TIMER_CALLBACK_MEMBER(zrt80_beepoff);
};
READ8_MEMBER( zrt80_state::zrt80_10_r )
{
UINT8 ret = m_term_data;
machine().device("maincpu")->execute().set_input_line(INPUT_LINE_NMI, CLEAR_LINE);
return ret;
}
TIMER_CALLBACK_MEMBER(zrt80_state::zrt80_beepoff)
{
beep_set_state(m_beep, 0);
}
WRITE8_MEMBER(zrt80_state::zrt80_30_w)
{
machine().scheduler().timer_set(attotime::from_msec(100), timer_expired_delegate(FUNC(zrt80_state::zrt80_beepoff),this));
beep_set_state(m_beep, 1);
}
WRITE8_MEMBER(zrt80_state::zrt80_38_w)
{
machine().scheduler().timer_set(attotime::from_msec(400), timer_expired_delegate(FUNC(zrt80_state::zrt80_beepoff),this));
beep_set_state(m_beep, 1);
}
static ADDRESS_MAP_START(zrt80_mem, AS_PROGRAM, 8, zrt80_state)
ADDRESS_MAP_UNMAP_HIGH
AM_RANGE(0x0000, 0x0fff) AM_ROM // Z25 - Main firmware
AM_RANGE(0x1000, 0x1fff) AM_ROM // Z24 - Expansion
AM_RANGE(0x4000, 0x43ff) AM_RAM // Board RAM
// Normally video RAM is 0x800 but could be expanded up to 8K
AM_RANGE(0xc000, 0xdfff) AM_RAM AM_SHARE("videoram") // Video RAM
ADDRESS_MAP_END
static ADDRESS_MAP_START( zrt80_io, AS_IO, 8, zrt80_state)
ADDRESS_MAP_UNMAP_HIGH
ADDRESS_MAP_GLOBAL_MASK(0xff)
AM_RANGE(0x00, 0x07) AM_DEVREADWRITE("ins8250", ins8250_device, ins8250_r, ins8250_w )
AM_RANGE(0x08, 0x08) AM_DEVWRITE("crtc", mc6845_device, address_w)
AM_RANGE(0x09, 0x09) AM_DEVREADWRITE("crtc", mc6845_device, register_r, register_w)
AM_RANGE(0x10, 0x17) AM_READ(zrt80_10_r)
AM_RANGE(0x18, 0x1F) AM_READ_PORT("DIPSW2")
AM_RANGE(0x20, 0x27) AM_READ_PORT("DIPSW3")
AM_RANGE(0x30, 0x37) AM_WRITE(zrt80_30_w)
AM_RANGE(0x38, 0x3F) AM_WRITE(zrt80_38_w)
ADDRESS_MAP_END
/* Input ports */
static INPUT_PORTS_START( zrt80 )
PORT_START("DIPSW1")
PORT_DIPNAME( 0x01, 0x01, "Composite Sync" )
PORT_DIPSETTING( 0x01, "Negative" )
PORT_DIPSETTING( 0x00, "Positive" )
PORT_DIPNAME( 0x02, 0x02, "Vertical Sync" )
PORT_DIPSETTING( 0x02, "Negative" )
PORT_DIPSETTING( 0x00, "Positive" )
PORT_DIPNAME( 0x04, 0x00, "Video" )
PORT_DIPSETTING( 0x04, "Negative" )
PORT_DIPSETTING( 0x00, "Positive" )
PORT_DIPNAME( 0x08, 0x08, "Keypad" )
PORT_DIPSETTING( 0x08, "Numeric" )
PORT_DIPSETTING( 0x00, "Alternate Keyboard" )
PORT_DIPNAME( 0x10, 0x10, "Horizontal Sync" )
PORT_DIPSETTING( 0x10, "Negative" )
PORT_DIPSETTING( 0x00, "Positive" )
PORT_DIPNAME( 0x20, 0x20, "CPU" )
PORT_DIPSETTING( 0x20, "Operating" )
PORT_DIPSETTING( 0x00, "Reset" )
PORT_DIPNAME( 0x40, 0x40, "Keyboard strobe" )
PORT_DIPSETTING( 0x40, "Negative" )
PORT_DIPSETTING( 0x00, "Positive" )
PORT_DIPNAME( 0x80, 0x00, "Beeper" )
PORT_DIPSETTING( 0x80, "Silent" )
PORT_DIPSETTING( 0x00, "Enable" )
PORT_START("DIPSW2")
PORT_DIPNAME( 0x0f, 0x05, "Baud rate" )
PORT_DIPSETTING( 0x00, "50" )
PORT_DIPSETTING( 0x01, "75" )
PORT_DIPSETTING( 0x02, "110" )
PORT_DIPSETTING( 0x03, "134.5" )
PORT_DIPSETTING( 0x04, "150" )
PORT_DIPSETTING( 0x05, "300" )
PORT_DIPSETTING( 0x06, "600" )
PORT_DIPSETTING( 0x07, "1200" )
PORT_DIPSETTING( 0x08, "1800" )
PORT_DIPSETTING( 0x09, "2000" )
PORT_DIPSETTING( 0x0a, "2400" )
PORT_DIPSETTING( 0x0b, "3600" )
PORT_DIPSETTING( 0x0c, "4800" )
PORT_DIPSETTING( 0x0d, "7200" )
PORT_DIPSETTING( 0x0e, "9600" )
PORT_DIPSETTING( 0x0f, "19200" )
PORT_DIPNAME( 0x30, 0x20, "Parity" )
PORT_DIPSETTING( 0x00, "Odd" )
PORT_DIPSETTING( 0x10, "Even" )
PORT_DIPSETTING( 0x20, "Marking" )
PORT_DIPSETTING( 0x30, "Spacing" )
PORT_DIPNAME( 0x40, 0x40, "Handshake" )
PORT_DIPSETTING( 0x40, "CTS" )
PORT_DIPSETTING( 0x00, "XON/XOFF" )
PORT_DIPNAME( 0x80, 0x80, "Line Feed" )
PORT_DIPSETTING( 0x80, "No LF on CR" )
PORT_DIPSETTING( 0x00, "Auto" )
PORT_START("DIPSW3")
PORT_DIPNAME( 0x07, 0x07, "Display" )
PORT_DIPSETTING( 0x00, "96 x 24 15750Hz, 50Hz" )
PORT_DIPSETTING( 0x01, "80 x 48 15750Hz, 50Hz" )
PORT_DIPSETTING( 0x02, "80 x 24 15750Hz, 50Hz" )
PORT_DIPSETTING( 0x03, "96 x 24 15750Hz, 60Hz" )
PORT_DIPSETTING( 0x04, "80 x 48 18700Hz, 50Hz" )
PORT_DIPSETTING( 0x05, "80 x 24 17540Hz, 60Hz" )
PORT_DIPSETTING( 0x06, "80 x 48 15750Hz, 60Hz" )
PORT_DIPSETTING( 0x07, "80 x 24 15750Hz, 60Hz" )
PORT_DIPNAME( 0x18, 0x18, "Emulation" )
PORT_DIPSETTING( 0x00, "Adds" )
PORT_DIPSETTING( 0x08, "Beehive" )
PORT_DIPSETTING( 0x10, "LSI ADM-3" )
PORT_DIPSETTING( 0x18, "Heath H-19" )
PORT_DIPNAME( 0x20, 0x00, "Mode" )
PORT_DIPSETTING( 0x20, "Line" )
PORT_DIPSETTING( 0x00, "Local" )
PORT_DIPNAME( 0x40, 0x40, "Duplex" )
PORT_DIPSETTING( 0x40, "Full" )
PORT_DIPSETTING( 0x00, "Half" )
PORT_DIPNAME( 0x80, 0x80, "Wraparound" )
PORT_DIPSETTING( 0x80, "Disabled" )
PORT_DIPSETTING( 0x00, "Enabled" )
INPUT_PORTS_END
void zrt80_state::machine_reset()
{
beep_set_frequency(m_beep, 800);
m_term_data = 0;
}
void zrt80_state::video_start()
{
m_p_chargen = memregion("chargen")->base();
}
static MC6845_UPDATE_ROW( zrt80_update_row )
{
zrt80_state *state = device->machine().driver_data<zrt80_state>();
const rgb_t *palette = palette_entry_list_raw(bitmap.palette());
UINT8 chr,gfx,inv;
UINT16 mem,x;
UINT32 *p = &bitmap.pix32(y);
UINT8 polarity = state->ioport("DIPSW1")->read() & 4 ? 0xff : 0;
for (x = 0; x < x_count; x++)
{
inv = polarity;
if (x == cursor_x) inv ^= 0xff;
mem = (ma + x) & 0x1fff;
chr = state->m_p_videoram[mem];
if BIT(chr, 7)
{
inv ^= 0xff;
chr &= 0x7f;
}
gfx = state->m_p_chargen[(chr<<4) | ra] ^ inv;
/* Display a scanline of a character */
*p++ = palette[BIT(gfx, 7)];
*p++ = palette[BIT(gfx, 6)];
*p++ = palette[BIT(gfx, 5)];
*p++ = palette[BIT(gfx, 4)];
*p++ = palette[BIT(gfx, 3)];
*p++ = palette[BIT(gfx, 2)];
*p++ = palette[BIT(gfx, 1)];
*p++ = palette[BIT(gfx, 0)];
}
}
static MC6845_INTERFACE( zrt80_crtc6845_interface )
{
"screen",
false,
8 /*?*/,
NULL,
zrt80_update_row,
NULL,
DEVCB_NULL,
DEVCB_NULL,
DEVCB_NULL,
DEVCB_NULL,
NULL
};
static const ins8250_interface zrt80_com_interface =
{
DEVCB_NULL,
DEVCB_NULL,
DEVCB_CPU_INPUT_LINE("maincpu", INPUT_LINE_IRQ0),
DEVCB_NULL,
DEVCB_NULL,
DEVCB_NULL
};
WRITE8_MEMBER( zrt80_state::kbd_put )
{
m_term_data = data;
machine().device("maincpu")->execute().set_input_line(INPUT_LINE_NMI, ASSERT_LINE);
}
static ASCII_KEYBOARD_INTERFACE( keyboard_intf )
{
DEVCB_DRIVER_MEMBER(zrt80_state, kbd_put)
};
/* F4 Character Displayer */
static const gfx_layout zrt80_charlayout =
{
8, 16, /* 8 x 16 characters */
128, /* 128 characters */
1, /* 1 bits per pixel */
{ 0 }, /* no bitplanes */
/* x offsets */
{ 0, 1, 2, 3, 4, 5, 6, 7 },
/* y offsets */
{ 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 /* every char takes 16 bytes */
};
static GFXDECODE_START( zrt80 )
GFXDECODE_ENTRY( "chargen", 0x0000, zrt80_charlayout, 0, 1 )
GFXDECODE_END
static MACHINE_CONFIG_START( zrt80, zrt80_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu",Z80, XTAL_2_4576MHz)
MCFG_CPU_PROGRAM_MAP(zrt80_mem)
MCFG_CPU_IO_MAP(zrt80_io)
/* video hardware */
MCFG_SCREEN_ADD("screen", RASTER)
MCFG_SCREEN_REFRESH_RATE(60)
MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
MCFG_SCREEN_UPDATE_DEVICE("crtc", mc6845_device, screen_update)
MCFG_SCREEN_SIZE(640, 200)
MCFG_SCREEN_VISIBLE_AREA(0, 640 - 1, 0, 200 - 1)
MCFG_GFXDECODE(zrt80)
MCFG_PALETTE_LENGTH(2)
MCFG_PALETTE_INIT(monochrome_green)
/* sound hardware */
MCFG_SPEAKER_STANDARD_MONO("mono")
MCFG_SOUND_ADD(BEEPER_TAG, BEEP, 0)
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50)
/* Devices */
MCFG_MC6845_ADD("crtc", MC6845, XTAL_20MHz / 8, zrt80_crtc6845_interface)
MCFG_INS8250_ADD( "ins8250", zrt80_com_interface, 2457600 )
MCFG_ASCII_KEYBOARD_ADD(KEYBOARD_TAG, keyboard_intf)
MACHINE_CONFIG_END
/* ROM definition */
ROM_START( zrt80 )
ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
ROM_LOAD("zrt80mon.z25", 0x0000, 0x1000, CRC(e6ea96dc) SHA1(e3075e30bb2b85f9288d0b8b8cdf1d2b4f7586fd) )
//z24 is 2nd chip, used as expansion
ROM_REGION( 0x0800, "chargen", 0 )
ROM_LOAD("zrt80chr.z30", 0x0000, 0x0800, CRC(4dbdc60f) SHA1(20e393f7207a8440029c8290cdf2f121d317a37e) )
ROM_END
/* Driver */
/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */
COMP( 1982, zrt80, 0, 0, zrt80, zrt80, driver_device, 0, "Digital Research Computers", "ZRT-80", 0)
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