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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************
ALA13 - Acorn Plus 3
http://chrisacorns.computinghistory.org.uk/8bit_Upgrades/Acorn_Plus3.html
The Acorn Plus 3 was a hardware module that connected independently
of the Plus 1 and provided a double-density 3.5" disc drive connected
through a WD1770 drive controller and an ADFS ROM. There were two
versions of the Plus 3 produced: A Single-sided and a Double-sided
drive version.
**********************************************************************/
#include "emu.h"
#include "plus3.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(ELECTRON_PLUS3, electron_plus3_device, "electron_plus3", "Acorn Plus 3 Disc Expansion")
//-------------------------------------------------
// MACHINE_DRIVER( plus3 )
//-------------------------------------------------
FLOPPY_FORMATS_MEMBER(electron_plus3_device::floppy_formats)
FLOPPY_ACORN_SSD_FORMAT,
FLOPPY_ACORN_DSD_FORMAT,
FLOPPY_ACORN_ADFS_OLD_FORMAT
FLOPPY_FORMATS_END0
SLOT_INTERFACE_START(electron_floppies)
SLOT_INTERFACE("35dd", FLOPPY_35_DD)
SLOT_INTERFACE("525qd", FLOPPY_525_QD)
SLOT_INTERFACE_END
ROM_START( plus3 )
// Bank 4 Disc
ROM_REGION(0x4000, "exp_rom", 0)
ROM_DEFAULT_BIOS("adfs100")
// ADFS
ROM_SYSTEM_BIOS(0, "adfs100", "Acorn ADFS 1.00")
ROMX_LOAD("adfs.rom", 0x0000, 0x4000, CRC(3289bdc6) SHA1(e7c7a1094d50a3579751df2007269067c8ff6812), ROM_BIOS(1))
ROM_SYSTEM_BIOS(1, "adfs113", "PRES ADFS 1.13")
ROMX_LOAD("pres_adfs_113.rom", 0x0000, 0x4000, CRC(f06ca04a) SHA1(3c8221d63457c552aa2c9a502db632ce1dea66b4), ROM_BIOS(2))
ROM_SYSTEM_BIOS(2, "adfs115", "PRES ADFS 1.15")
ROMX_LOAD("pres_adfs_115.rom", 0x0000, 0x4000, CRC(8f81edc3) SHA1(32007425058a7b0f8bd5c17b3c22552aa3a03eca), ROM_BIOS(3))
// DFS
ROM_SYSTEM_BIOS(3, "dfs200", "Advanced 1770 DFS 2.00")
ROMX_LOAD("acp_dfs1770_200.rom", 0x0000, 0x4000, CRC(5a3a13c7) SHA1(d5dad7ab5a0237c44d0426cd85a8ec86545747e0), ROM_BIOS(4))
ROM_END
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
MACHINE_CONFIG_MEMBER( electron_plus3_device::device_add_mconfig )
/* fdc */
MCFG_WD1770_ADD("fdc", XTAL_16MHz / 2)
MCFG_FLOPPY_DRIVE_ADD_FIXED("fdc:0", electron_floppies, "35dd", floppy_formats)
MCFG_FLOPPY_DRIVE_SOUND(true)
MCFG_FLOPPY_DRIVE_ADD("fdc:1", electron_floppies, nullptr, floppy_formats)
MCFG_FLOPPY_DRIVE_SOUND(true)
/* pass-through */
MCFG_ELECTRON_PASSTHRU_EXPANSION_SLOT_ADD(nullptr)
MACHINE_CONFIG_END
const tiny_rom_entry *electron_plus3_device::device_rom_region() const
{
return ROM_NAME( plus3 );
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// electron_plus3_device - constructor
//-------------------------------------------------
electron_plus3_device::electron_plus3_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, ELECTRON_PLUS3, tag, owner, clock)
, device_electron_expansion_interface(mconfig, *this)
, m_exp_rom(*this, "exp_rom")
, m_fdc(*this, "fdc")
, m_floppy0(*this, "fdc:0")
, m_floppy1(*this, "fdc:1")
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void electron_plus3_device::device_start()
{
address_space& space = machine().device("maincpu")->memory().space(AS_PROGRAM);
m_slot = dynamic_cast<electron_expansion_slot_device *>(owner());
space.install_readwrite_handler(0xfcc0, 0xfcc0, READ8_DELEGATE(electron_plus3_device, wd1770_status_r), WRITE8_DELEGATE(electron_plus3_device, wd1770_status_w));
space.install_readwrite_handler(0xfcc4, 0xfcc7, READ8_DEVICE_DELEGATE(m_fdc, wd1770_device, read), WRITE8_DEVICE_DELEGATE(m_fdc, wd1770_device, write));
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void electron_plus3_device::device_reset()
{
machine().root_device().membank("bank2")->configure_entry(4, memregion("exp_rom")->base());
}
//**************************************************************************
// IMPLEMENTATION
//**************************************************************************
READ8_MEMBER(electron_plus3_device::wd1770_status_r)
{
return 0xff;
}
WRITE8_MEMBER(electron_plus3_device::wd1770_status_w)
{
floppy_image_device *floppy = nullptr;
m_drive_control = data;
// bit 0, 1: drive select
if (BIT(data, 0)) floppy = m_floppy0->get_device();
if (BIT(data, 1)) floppy = m_floppy1->get_device();
m_fdc->set_floppy(floppy);
// bit 2: side select
if (floppy)
floppy->ss_w(BIT(data, 2));
// bit 3: density
m_fdc->dden_w(BIT(data, 3));
// bit 5: reset
if (!BIT(data, 5)) m_fdc->soft_reset();
}
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