// license:BSD-3-Clause
// copyright-holders:Robbbert
/***************************************************************************
Micro Craft Dimension 68000
28/12/2011 Skeleton driver.
This computer had the facility for plug-in cards to emulate popular
computers of the time such as apple, trs80, kaypro, etc. The floppy
disk parameters could be set to be able to read the disks of the
various systems, or you create any other format you wished.
There is no schematic available, so not fully able to emulate at
this time.
ToDo:
- Floppy controller
- Floppy formats (not sure if MESS supports user-defined formats)
- Banking
- Graphics display (including colour and video_control options)
- DUART
- RTC
- RS232 interface
- Keyboard
- Centronics printer
- Video-high
- Video-reset
- Game switches, paddles and timers
- The plug-in boards
- Emulator trap function
****************************************************************************/
#include "emu.h"
#include "cpu/m68000/m68000.h"
#include "sound/speaker.h"
#include "video/mc6845.h"
#include "machine/keyboard.h"
#include "machine/upd765.h"
#include "softlist.h"
class dim68k_state : public driver_device
{
public:
dim68k_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_speaker(*this, "speaker"),
m_ram(*this, "ram"),
m_palette(*this, "palette") { }
DECLARE_READ16_MEMBER( dim68k_duart_r );
DECLARE_READ16_MEMBER( dim68k_fdc_r );
DECLARE_READ16_MEMBER( dim68k_game_switches_r );
DECLARE_READ16_MEMBER( dim68k_speaker_r );
DECLARE_WRITE16_MEMBER( dim68k_banksw_w );
DECLARE_WRITE16_MEMBER( dim68k_duart_w );
DECLARE_WRITE16_MEMBER( dim68k_fdc_w );
DECLARE_WRITE16_MEMBER( dim68k_printer_strobe_w );
DECLARE_WRITE16_MEMBER( dim68k_reset_timers_w );
DECLARE_WRITE16_MEMBER( dim68k_speaker_w );
DECLARE_WRITE16_MEMBER( dim68k_video_control_w );
DECLARE_WRITE16_MEMBER( dim68k_video_high_w );
DECLARE_WRITE16_MEMBER( dim68k_video_reset_w );
DECLARE_WRITE8_MEMBER(kbd_put);
MC6845_UPDATE_ROW(crtc_update_row);
const UINT8 *m_p_chargen;
bool m_speaker_bit;
UINT8 m_video_control;
UINT8 m_term_data;
virtual void machine_reset() override;
virtual void video_start() override;
required_device<cpu_device> m_maincpu;
required_device<mc6845_device> m_crtc;
required_device<speaker_sound_device> m_speaker;
required_shared_ptr<UINT16> m_ram;
required_device<palette_device> m_palette;
};
READ16_MEMBER( dim68k_state::dim68k_duart_r )
// Port A is for the keyboard : 300 baud, no parity, 8 bits, 1 stop bit. Port B is for RS232.
// The device also controls the parallel printer (except the strobe) and the RTC.
// Device = SCN2681, not emulated. The keyboard is standard ASCII, so we can use the terminal
// keyboard for now.
{
if (offset==3)
return m_term_data;
else
return 0;
}
READ16_MEMBER( dim68k_state::dim68k_fdc_r )
{
return 0;
}
READ16_MEMBER( dim68k_state::dim68k_game_switches_r )
// Reading the game port switches
// FFCC11 = switch 0; FFCC13 = switch 1, etc to switch 3
// FFCC19 = paddle 0; FFCC1B = paddle 1, etc to paddle 3
{
return 0xffff;
}
READ16_MEMBER( dim68k_state::dim68k_speaker_r )
// Any read or write of this address will toggle the position of the speaker cone
{
m_speaker_bit ^= 1;
m_speaker->level_w(m_speaker_bit);
return 0;
}
WRITE16_MEMBER( dim68k_state::dim68k_speaker_w )
{
m_speaker_bit ^= 1;
m_speaker->level_w(m_speaker_bit);
}
WRITE16_MEMBER( dim68k_state::dim68k_fdc_w )
{
}
WRITE16_MEMBER( dim68k_state::dim68k_video_high_w )
// "write high byte of address in memory of start of display buffer"
{
}
WRITE16_MEMBER( dim68k_state::dim68k_video_control_w )
{
/* D7 0 = Hires/Graphics; 1= Lores/Text [not emulated yet]
D6 0 = 8 dots per character; 1 = 7 dots [emulated]
D5 0 = CRTC and CPU run Asynchronously; 1 = Synchronously [won't be emulated]
D4,D3 Dot clock: 00=14MHz; 01=3.58MHz; 10=7MHz; 11=1.79MHz [emulated]
D2 0 = Screen On; 1 = Off [emulated]
D1 0 = Standard Chars & LoRes; 1 = Alternate Chars & HiRes [not emulated yet]
D0 0 = Non-Mixed (all text or all Graphics); 1 = Mixed (Colour Graphics and Monochrome Text) [not emulated yet]
*/
m_crtc->set_hpixels_per_column((data & 0x40) ? 7 : 8);
m_video_control = data;
switch (data & 0x18)
{
case 0x00: m_crtc->set_clock(XTAL_14MHz);
break;
case 0x08: m_crtc->set_clock(XTAL_3_579545MHz);
break;
case 0x10: m_crtc->set_clock(XTAL_14MHz / 2);
break;
case 0x18: m_crtc->set_clock(XTAL_3_579545MHz / 2);
break;
}
}
WRITE16_MEMBER( dim68k_state::dim68k_video_reset_w )
{
}
WRITE16_MEMBER( dim68k_state::dim68k_duart_w )
{
}
WRITE16_MEMBER( dim68k_state::dim68k_reset_timers_w )
// reset game port timer before reading paddles
{
}
WRITE16_MEMBER( dim68k_state::dim68k_printer_strobe_w )
// anything sent here will trigger a one-shot for a strobe pulse
{
}
WRITE16_MEMBER( dim68k_state::dim68k_banksw_w )
// At boot time, the rom and IO occupy 0-FFFF, this moves it to the proper place
{
}
static ADDRESS_MAP_START(dim68k_mem, AS_PROGRAM, 16, dim68k_state)
ADDRESS_MAP_UNMAP_HIGH
AM_RANGE(0x00000000, 0x00feffff) AM_RAM AM_SHARE("ram") // 16MB RAM / ROM at boot
AM_RANGE(0x00ff0000, 0x00ff1fff) AM_ROM AM_REGION("bootrom", 0)
AM_RANGE(0x00ff2000, 0x00ff7fff) AM_RAM // Graphics Video RAM
AM_RANGE(0x00ff8000, 0x00ff8001) AM_DEVREADWRITE8("crtc", mc6845_device, status_r, address_w, 0xff)
AM_RANGE(0x00ff8002, 0x00ff8003) AM_DEVREADWRITE8("crtc", mc6845_device, register_r, register_w, 0xff)
AM_RANGE(0x00ff8004, 0x00ff8005) AM_WRITE(dim68k_video_high_w)
AM_RANGE(0x00ff8008, 0x00ff8009) AM_WRITE(dim68k_video_control_w)
AM_RANGE(0x00ff800a, 0x00ff800b) AM_WRITE(dim68k_video_reset_w)
AM_RANGE(0x00ff8800, 0x00ff8fff) AM_ROM AM_REGION("cop6512",0) // slot 1 controller rom
AM_RANGE(0x00ff9000, 0x00ff97ff) AM_ROM AM_REGION("copz80",0) // slot 2 controller rom
AM_RANGE(0x00ff9800, 0x00ff9fff) AM_ROM AM_REGION("cop8086",0) // slot 3 controller rom
#if 0
AM_RANGE(0x00ffa000, 0x00ffa7ff) AM_ROM // slot 4 controller rom
AM_RANGE(0x00ffa800, 0x00ffafff) AM_ROM // slot 5 controller rom
AM_RANGE(0x00ffb000, 0x00ffb7ff) AM_ROM // slot 6 controller rom
#endif
AM_RANGE(0x00ffc400, 0x00ffc41f) AM_READWRITE(dim68k_duart_r,dim68k_duart_w) // Signetics SCN2681AC1N40 Dual UART
AM_RANGE(0x00ffc800, 0x00ffc801) AM_READWRITE(dim68k_speaker_r,dim68k_speaker_w)
AM_RANGE(0x00ffcc00, 0x00ffcc1f) AM_READWRITE(dim68k_game_switches_r,dim68k_reset_timers_w)
AM_RANGE(0x00ffd000, 0x00ffd003) AM_DEVICE8("fdc",upd765a_device,map,0x00ff) // NEC uPD765A
AM_RANGE(0x00ffd004, 0x00ffd005) AM_READWRITE(dim68k_fdc_r,dim68k_fdc_w)
//AM_RANGE(0x00ffd400, 0x00ffd403) emulation trap control
AM_RANGE(0x00ffd800, 0x00ffd801) AM_WRITE(dim68k_printer_strobe_w)
AM_RANGE(0x00ffdc00, 0x00ffdc01) AM_WRITE(dim68k_banksw_w)
ADDRESS_MAP_END
/* Input ports */
static INPUT_PORTS_START( dim68k )
INPUT_PORTS_END
void dim68k_state::machine_reset()
{
UINT8* ROM = memregion("bootrom")->base();
memcpy((UINT8*)m_ram.target(), ROM, 0x2000);
m_maincpu->reset();
}
void dim68k_state::video_start()
{
m_p_chargen = memregion("chargen")->base();
}
// Text-only; graphics isn't emulated yet. Need to find out if hardware cursor is used.
MC6845_UPDATE_ROW( dim68k_state::crtc_update_row )
{
const rgb_t *palette = m_palette->palette()->entry_list_raw();
UINT8 chr,gfx,x,xx,inv;
UINT16 chr16=0x2020; // set to spaces if screen is off
UINT32 *p = &bitmap.pix32(y);
UINT8 screen_on = ~m_video_control & 4;
UINT8 dot8 = ~m_video_control & 40;
// need to divide everything in half to cater for 16-bit reads
x_count /= 2;
ma /= 2;
xx = 0;
for (x = 0; x < x_count; x++)
{
if (screen_on)
chr16 = m_ram[ma+x]; // reads 2 characters
inv=0;
if (xx == cursor_x && screen_on) inv=0xff;
xx++;
chr = chr16>>8;
gfx = m_p_chargen[(chr<<4) | ra] ^ inv ^ ((chr & 0x80) ? 0xff : 0);
*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)];
if (dot8) *p++ = palette[BIT(gfx, 1)];
inv = 0;
if (xx == cursor_x) inv=0xff;
xx++;
chr = chr16;
gfx = m_p_chargen[(chr<<4) | ra] ^ inv ^ ((chr & 0x80) ? 0xff : 0);
*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)];
if (dot8) *p++ = palette[BIT(gfx, 1)];
}
}
/* F4 Character Displayer */
static const gfx_layout dim68k_charlayout =
{
8, 16, /* 8 x 16 characters */
256, /* 256 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( dim68k )
GFXDECODE_ENTRY( "chargen", 0x0000, dim68k_charlayout, 0, 1 )
GFXDECODE_END
static SLOT_INTERFACE_START( dim68k_floppies )
SLOT_INTERFACE( "525hd", FLOPPY_525_HD )
SLOT_INTERFACE_END
WRITE8_MEMBER( dim68k_state::kbd_put )
{
m_term_data = data;
}
static MACHINE_CONFIG_START( dim68k, dim68k_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", M68000, XTAL_10MHz)
MCFG_CPU_PROGRAM_MAP(dim68k_mem)
/* video hardware */
MCFG_SCREEN_ADD("screen", RASTER)
MCFG_SCREEN_REFRESH_RATE(50)
MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
MCFG_SCREEN_UPDATE_DEVICE("crtc", mc6845_device, screen_update)
MCFG_SCREEN_SIZE(640, 480)
MCFG_SCREEN_VISIBLE_AREA(0, 640-1, 0, 250-1)
MCFG_PALETTE_ADD_MONOCHROME("palette")
MCFG_GFXDECODE_ADD("gfxdecode", "palette", dim68k)
/* sound hardware */
MCFG_SPEAKER_STANDARD_MONO("mono")
MCFG_SOUND_ADD("speaker", SPEAKER_SOUND, 0)
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50)
/* Devices */
MCFG_UPD765A_ADD("fdc", true, true) // these options unknown
MCFG_FLOPPY_DRIVE_ADD("fdc:0", dim68k_floppies, "525hd", floppy_image_device::default_floppy_formats)
MCFG_FLOPPY_DRIVE_ADD("fdc:1", dim68k_floppies, "525hd", floppy_image_device::default_floppy_formats)
MCFG_MC6845_ADD("crtc", MC6845, "screen", 1790000)
MCFG_MC6845_SHOW_BORDER_AREA(false)
MCFG_MC6845_CHAR_WIDTH(8)
MCFG_MC6845_UPDATE_ROW_CB(dim68k_state, crtc_update_row)
MCFG_DEVICE_ADD("keyboard", GENERIC_KEYBOARD, 0)
MCFG_GENERIC_KEYBOARD_CB(WRITE8(dim68k_state, kbd_put))
// software lists
MCFG_SOFTWARE_LIST_ADD("flop_list", "dim68k")
MACHINE_CONFIG_END
/*
68000
MC101A 82S100
MC102B 82S100
MC103E 2732A
MC104 2732A label "4050" underneath
MC105 2732A char gen
6512
MC106 82LS135 U24
MC107 82LS135 U20
MC108 82S137 U23
MC109 82S131 U16
MC110 82LS135 U35
Z80
MC111 82S123 U11
8086
MC112 82LS135 U18
MC113 82S153 U16
*/
/* ROM definition */
ROM_START( dim68k )
ROM_REGION( 0x2000, "bootrom", ROMREGION_ERASEFF )
ROM_LOAD16_BYTE( "mc103e.bin", 0x0000, 0x1000, CRC(4730c902) SHA1(5c4bb79ad22def721a22eb63dd05e0391c8082be))
ROM_LOAD16_BYTE( "mc104.bin", 0x0001, 0x1000, CRC(14b04575) SHA1(43e15d9ebe1c9c1bf1bcfc1be3899a49e6748200))
ROM_REGION( 0x1000, "chargen", ROMREGION_ERASEFF )
ROM_LOAD( "mc105e.bin", 0x0000, 0x1000, CRC(7a09daa8) SHA1(844bfa579293d7c3442fcbfa21bda75fff930394))
// The remaining roms may not be in the correct positions or being loaded correctly
ROM_REGION( 0x1000, "cop6512", ROMREGION_ERASEFF )
ROM_LOAD16_WORD_SWAP( "mc106.bin", 0x0000, 0x0100, CRC(11530d8a) SHA1(e3eae266535383bcaee2d84d7bed6052d40e4e4a))
ROM_LOAD16_WORD_SWAP( "mc107.bin", 0x0100, 0x0100, CRC(966db11b) SHA1(3c3105ac842602d8e01b0f924152fd672a85f00c))
ROM_LOAD16_WORD_SWAP( "mc108.bin", 0x0200, 0x0400, CRC(687f9b0a) SHA1(ed9f1265b25f89f6d3cf8cd0a7b0fb73cb129f9f))
ROM_LOAD16_WORD_SWAP( "mc109.bin", 0x0600, 0x0200, CRC(4a857f98) SHA1(9f2bbc2171fc49f65aa798c9cd7799a26afd2ddf))
ROM_LOAD16_WORD_SWAP( "mc110.bin", 0x0800, 0x0100, CRC(e207b457) SHA1(a8987ba3d1bbdb3d8b3b11cec90c532ff09e762e))
ROM_REGION( 0x1000, "copz80", ROMREGION_ERASEFF )
ROM_LOAD16_WORD_SWAP( "mc111.bin", 0x0000, 0x0020, CRC(6a380057) SHA1(6522a7b3e0af9db14a6ed04d4eec3ee6e44c2dab))
ROM_REGION( 0x1000, "cop8086", ROMREGION_ERASEFF )
ROM_LOAD16_WORD_SWAP( "mc112.bin", 0x0000, 0x0100, CRC(dfd4cdbb) SHA1(a7831d415943fa86c417066807038bccbabb2573))
ROM_LOAD( "mc113.bin", 0x0100, 0x00ef, CRC(594bdf05) SHA1(36db911a27d930e023fa12683e86e9eecfffdba6))
ROM_REGION( 0x1000, "mb", ROMREGION_ERASEFF ) // mainboard unknown
ROM_LOAD( "mc102.bin", 0x0000, 0x00fa, CRC(38e2abac) SHA1(0d7e730b46fc162764c69c51dea3bbe8337b1a7d))
ROM_LOAD( "mc101.bin", 0x0100, 0x00fa, CRC(caffb3a0) SHA1(36f5140b306565794c4d856e0c20589b8f2a37f4))
ROM_END
/* Driver */
/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */
COMP( 1984, dim68k, 0, 0, dim68k, dim68k, driver_device, 0, "Micro Craft", "Dimension 68000", MACHINE_NOT_WORKING)