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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************
Opus Challenger 3-in-1
http://chrisacorns.computinghistory.org.uk/8bit_Upgrades/Opus_Challenger3.html
http://www.beebmaster.co.uk/8bit/Challenger.html
OPUS CHALLENGER MEMORY MAP
Read Write
&FCF8 1770 Status register 1770 command register
&FCF9 1770 track register
&FCFA 1770 sector register
&FCFB 1770 data register
&FCFC 1770 drive control
Drive control register
0 Select side: 0=side 0, 1=side 1
1 Select drive 0
2 Select drive 1
3 ?Unused?
4 ?Always Set
5 Density select: 0=double, 1=single
6 ?Unused?
7 ?Unused?
The RAM is accessible through JIM (page &FD). One page is visible in JIM at a time.
The selected page is controlled by the two paging registers:
&FCFE Paging register MSB
&FCFF Paging register LSB
256K model has 1024 pages &000 to &3FF
512K model has 2048 pages &000 to &7FF
**********************************************************************/
#include "emu.h"
#include "opus3.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(BBC_OPUS3, bbc_opus3_device, "bbc_opus3", "Opus Challenger 3-in-1")
//-------------------------------------------------
// MACHINE_DRIVER( opus3 )
//-------------------------------------------------
FLOPPY_FORMATS_MEMBER(bbc_opus3_device::floppy_formats)
FLOPPY_ACORN_SSD_FORMAT,
FLOPPY_ACORN_DSD_FORMAT,
FLOPPY_FSD_FORMAT,
FLOPPY_OPUS_DDOS_FORMAT,
FLOPPY_OPUS_DDCPM_FORMAT
FLOPPY_FORMATS_END0
void bbc_floppies(device_slot_interface &device)
{
device.option_add("525qd", FLOPPY_525_QD);
}
ROM_START( opus3 )
ROM_REGION(0x4000, "dfs_rom", 0)
ROM_DEFAULT_BIOS("ch103")
ROM_SYSTEM_BIOS(0, "ch100", "Challenger 1.00")
ROMX_LOAD("ch100.rom", 0x0000, 0x4000, CRC(740a8335) SHA1(f3c75c21bcd7d4a4dfff922fd287230dcdb91d0e), ROM_BIOS(0))
ROM_SYSTEM_BIOS(1, "ch101", "Challenger 1.01")
ROMX_LOAD("ch101.rom", 0x0000, 0x4000, CRC(2f64503d) SHA1(37ee3f20bed50555720703b279f62aab0ed28922), ROM_BIOS(1))
ROM_SYSTEM_BIOS(2, "ch103", "Challenger 1.03")
ROMX_LOAD("ch103.rom", 0x0000, 0x4000, CRC(98367cf4) SHA1(eca3631aa420691f96b72bfdf2e9c2b613e1bf33), ROM_BIOS(2))
ROM_END
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
MACHINE_CONFIG_START(bbc_opus3_device::device_add_mconfig)
/* fdc */
MCFG_DEVICE_ADD("wd1770", WD1770, 16_MHz_XTAL / 2)
MCFG_WD_FDC_DRQ_CALLBACK(WRITELINE(*this, bbc_opus3_device, fdc_drq_w))
MCFG_FLOPPY_DRIVE_ADD("wd1770:0", bbc_floppies, "525qd", floppy_formats)
MCFG_FLOPPY_DRIVE_SOUND(true)
MCFG_FLOPPY_DRIVE_ADD("wd1770:1", bbc_floppies, nullptr, floppy_formats)
MCFG_FLOPPY_DRIVE_SOUND(true)
/* ram disk */
MCFG_RAM_ADD("ramdisk")
MCFG_RAM_DEFAULT_SIZE("512K")
MCFG_RAM_EXTRA_OPTIONS("256K")
MCFG_RAM_DEFAULT_VALUE(0x00)
MACHINE_CONFIG_END
const tiny_rom_entry *bbc_opus3_device::device_rom_region() const
{
return ROM_NAME( opus3 );
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// bbc_opus3_device - constructor
//-------------------------------------------------
bbc_opus3_device::bbc_opus3_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, BBC_OPUS3, tag, owner, clock),
device_bbc_1mhzbus_interface(mconfig, *this),
m_dfs_rom(*this, "dfs_rom"),
m_ramdisk(*this, "ramdisk"),
m_fdc(*this, "wd1770"),
m_floppy0(*this, "wd1770:0"),
m_floppy1(*this, "wd1770:1")
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void bbc_opus3_device::device_start()
{
address_space& space = machine().device("maincpu")->memory().space(AS_PROGRAM);
m_slot = dynamic_cast<bbc_1mhzbus_slot_device *>(owner());
space.install_readwrite_handler(0xfcf8, 0xfcfb, read8sm_delegate(FUNC(wd1770_device::read), m_fdc.target()), write8sm_delegate(FUNC(wd1770_device::write), m_fdc.target()));
space.install_write_handler(0xfcfc, 0xfcfc, WRITE8_DELEGATE(bbc_opus3_device, wd1770l_write));
space.install_write_handler(0xfcfe, 0xfcff, WRITE8_DELEGATE(bbc_opus3_device, page_w));
space.install_readwrite_handler(0xfd00, 0xfdff, READ8_DELEGATE(bbc_opus3_device, ramdisk_r), WRITE8_DELEGATE(bbc_opus3_device, ramdisk_w));
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void bbc_opus3_device::device_reset()
{
machine().root_device().membank("bank4")->configure_entry(12, memregion("dfs_rom")->base());
}
//**************************************************************************
// IMPLEMENTATION
//**************************************************************************
WRITE8_MEMBER(bbc_opus3_device::wd1770l_write)
{
floppy_image_device *floppy = nullptr;
// bit 1, 2: drive select
if (BIT(data, 1)) floppy = m_floppy0->get_device();
if (BIT(data, 2)) floppy = m_floppy1->get_device();
m_fdc->set_floppy(floppy);
// bit 0: side select
if (floppy)
floppy->ss_w(BIT(data, 0));
// bit 4: interrupt enabled
m_fdc_ie = BIT(data, 4);
// bit 5: density
m_fdc->dden_w(BIT(data, 5));
}
WRITE_LINE_MEMBER(bbc_opus3_device::fdc_drq_w)
{
m_fdc_drq = state;
m_slot->nmi_w((m_fdc_drq && m_fdc_ie) ? ASSERT_LINE : CLEAR_LINE);
}
WRITE8_MEMBER(bbc_opus3_device::page_w)
{
switch (offset)
{
case 0x00: m_ramdisk_page = (m_ramdisk_page & 0x00ff) | (data << 8); break;
case 0x01: m_ramdisk_page = (m_ramdisk_page & 0xff00) | (data << 0); break;
}
}
READ8_MEMBER(bbc_opus3_device::ramdisk_r)
{
if ((m_ramdisk_page << 8) < m_ramdisk->size())
return m_ramdisk->read((m_ramdisk_page << 8) + offset);
else
return 0xff;
}
WRITE8_MEMBER(bbc_opus3_device::ramdisk_w)
{
if ((m_ramdisk_page << 8) < m_ramdisk->size())
m_ramdisk->write((m_ramdisk_page << 8) + offset, data);
}
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