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/*********************************************************************
bml3mp1805.c
Hitachi MP-1805 floppy disk controller card for the MB-6890
Floppy drive is attached
*********************************************************************/
#include "emu.h"
#include "bml3mp1805.h"
/***************************************************************************
PARAMETERS
***************************************************************************/
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
const device_type BML3BUS_MP1805 = &device_creator<bml3bus_mp1805_device>;
static const floppy_interface bml3_mp1805_floppy_interface =
{
DEVCB_NULL,
DEVCB_NULL,
DEVCB_NULL,
DEVCB_NULL,
DEVCB_NULL,
FLOPPY_STANDARD_3_SSDD,
LEGACY_FLOPPY_OPTIONS_NAME(default),
NULL
};
WRITE_LINE_MEMBER( bml3bus_mp1805_device::bml3_mc6843_intrq_w )
{
if (state) {
m_bml3bus->set_nmi_line(PULSE_LINE);
}
}
const mc6843_interface bml3_6843_if =
{
DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, bml3bus_mp1805_device, bml3_mc6843_intrq_w)
};
#define MP1805_ROM_REGION "mp1805_rom"
ROM_START( mp1805 )
ROM_REGION(0x10000, MP1805_ROM_REGION, 0)
// MP-1805 disk controller ROM, which replaces part of the system ROM
ROM_LOAD( "mp1805.rom", 0xf800, 0x0800, BAD_DUMP CRC(b532d8d9) SHA1(6f1160356d5bf64b5926b1fdb60db414edf65f22))
ROM_END
MACHINE_CONFIG_FRAGMENT( mp1805 )
MCFG_MC6843_ADD( "mc6843", bml3_6843_if )
MCFG_LEGACY_FLOPPY_4_DRIVES_ADD(bml3_mp1805_floppy_interface)
MACHINE_CONFIG_END
/***************************************************************************
FUNCTION PROTOTYPES
***************************************************************************/
//-------------------------------------------------
// machine_config_additions - device-specific
// machine configurations
//-------------------------------------------------
machine_config_constructor bml3bus_mp1805_device::device_mconfig_additions() const
{
return MACHINE_CONFIG_NAME( mp1805 );
}
//-------------------------------------------------
// rom_region - device-specific ROM region
//-------------------------------------------------
const rom_entry *bml3bus_mp1805_device::device_rom_region() const
{
return ROM_NAME( mp1805 );
}
READ8_MEMBER( bml3bus_mp1805_device::bml3_mp1805_r)
{
// TODO: read supported or not?
// return mc6843_drq_r(m_mc6843) ? 0x00 : 0x80;
return -1;
}
WRITE8_MEMBER( bml3bus_mp1805_device::bml3_mp1805_w)
{
// b7 b6 b5 b4 b3 b2 b1 b0
// MT ? ? ? D3 D2 D1 D0
// MT: 0=motor off, 1=motor on
// Dn: 1=select drive <n>
int drive_select = data & 0x0f;
int drive;
// TODO: MESS UI for flipping disk? Note that D88 images are double-sided, but the physical drive is single-sided
int side = 0;
int motor = BIT(data, 7);
const char *floppy_name = NULL;
switch (drive_select) {
case 1:
drive = 0;
break;
case 2:
drive = 1;
break;
case 4:
drive = 2;
break;
case 8:
drive = 3;
break;
default:
// TODO: what's the correct behaviour if more than one drive select bit is set? Or no bit set?
drive = 0;
break;
}
switch (drive) {
case 0:
floppy_name = FLOPPY_0;
break;
case 1:
floppy_name = FLOPPY_1;
break;
case 2:
floppy_name = FLOPPY_2;
break;
case 3:
floppy_name = FLOPPY_3;
break;
}
device_t *floppy = subdevice(floppy_name);
m_mc6843->set_drive(drive);
floppy_mon_w(floppy, motor);
floppy_drive_set_ready_state(floppy, ASSERT_LINE, 0);
m_mc6843->set_side(side);
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
bml3bus_mp1805_device::bml3bus_mp1805_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
device_t(mconfig, BML3BUS_MP1805, "Hitachi MP-1805 Floppy Controller Card", tag, owner, clock, "bml3mp1805", __FILE__),
device_bml3bus_card_interface(mconfig, *this),
m_mc6843(*this, "mc6843")
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void bml3bus_mp1805_device::device_start()
{
// set_bml3bus_device makes m_slot valid
set_bml3bus_device();
m_rom = memregion(MP1805_ROM_REGION)->base();
// install into memory
address_space &space_prg = machine().firstcpu->space(AS_PROGRAM);
space_prg.install_readwrite_handler(0xff18, 0xff1f, read8_delegate( FUNC(mc6843_device::read), (mc6843_device*)m_mc6843), write8_delegate(FUNC(mc6843_device::write), (mc6843_device*)m_mc6843) );
space_prg.install_readwrite_handler(0xff20, 0xff20, read8_delegate( FUNC(bml3bus_mp1805_device::bml3_mp1805_r), this), write8_delegate(FUNC(bml3bus_mp1805_device::bml3_mp1805_w), this) );
// overwriting the main ROM (rather than using e.g. install_rom) should mean that bank switches for RAM expansion still work...
UINT8 *mainrom = device().machine().root_device().memregion("maincpu")->base();
memcpy(mainrom + 0xf800, m_rom + 0xf800, 0x800);
}
void bml3bus_mp1805_device::device_reset()
{
}
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