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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 SS Select side: 0=side 0, 1=side 1
1 DS0 Select drive 0
2 DS1 Select drive 1
3 DS2 Select drive 2
4 MO Motor enable
5 DDEN Density select: 0=double, 1=single
6 NC
7 NC
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")
DEFINE_DEVICE_TYPE(BBC_OPUSA, bbc_opusa_device, "bbc_opusa", "Opus Challenger ADFS")
//-------------------------------------------------
// FLOPPY_FORMATS( floppy_formats )
//-------------------------------------------------
void bbc_opus3_device::floppy_formats(format_registration &fr)
{
fr.add_mfm_containers();
fr.add(FLOPPY_ACORN_SSD_FORMAT);
fr.add(FLOPPY_ACORN_DSD_FORMAT);
fr.add(FLOPPY_ACORN_ADFS_OLD_FORMAT);
fr.add(FLOPPY_ACORN_DOS_FORMAT);
fr.add(FLOPPY_FSD_FORMAT);
fr.add(FLOPPY_OPUS_DDOS_FORMAT);
fr.add(FLOPPY_OPUS_DDCPM_FORMAT);
}
void bbc_floppies(device_slot_interface &device)
{
device.option_add("525qd", FLOPPY_525_QD);
}
//-------------------------------------------------
// ROM( opus3 )
//-------------------------------------------------
ROM_START( opus3 )
ROM_REGION(0x4000, "exp_rom", 0)
ROM_DEFAULT_BIOS("ch103")
ROM_SYSTEM_BIOS(0, "ch100", "Challenger 1.00")
ROMX_LOAD("chal100.rom", 0x0000, 0x4000, CRC(740a8335) SHA1(f3c75c21bcd7d4a4dfff922fd287230dcdb91d0e), ROM_BIOS(0))
ROM_SYSTEM_BIOS(1, "ch101", "Challenger 1.01")
ROMX_LOAD("chal101.rom", 0x0000, 0x4000, CRC(2f64503d) SHA1(37ee3f20bed50555720703b279f62aab0ed28922), ROM_BIOS(1))
ROM_SYSTEM_BIOS(2, "ch103", "Challenger 1.03")
ROMX_LOAD("chal103.rom", 0x0000, 0x4000, CRC(98367cf4) SHA1(eca3631aa420691f96b72bfdf2e9c2b613e1bf33), ROM_BIOS(2))
ROM_END
ROM_START( opusa )
ROM_REGION(0x8000, "exp_rom", 0)
ROM_DEFAULT_BIOS("ch200")
ROM_SYSTEM_BIOS(0, "ch200", "Challenger ADFS")
ROMX_LOAD("challenger adfs_dfs.rom", 0x0000, 0x8000, CRC(e922c19a) SHA1(b9f5c749412528e4f8e9cda9f13e10f8405bb195), ROM_BIOS(0))
ROM_END
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void bbc_opus3_device::device_add_mconfig(machine_config &config)
{
WD1770(config, m_fdc, 16_MHz_XTAL / 2);
m_fdc->drq_wr_callback().set(DEVICE_SELF_OWNER, FUNC(bbc_1mhzbus_slot_device::nmi_w));
FLOPPY_CONNECTOR(config, m_floppy[0], bbc_floppies, "525qd", floppy_formats).enable_sound(true);
FLOPPY_CONNECTOR(config, m_floppy[1], bbc_floppies, nullptr, floppy_formats).enable_sound(true);
RAM(config, m_ramdisk).set_default_size("512K").set_extra_options("256K").set_default_value(0);
}
const tiny_rom_entry *bbc_opus3_device::device_rom_region() const
{
return ROM_NAME( opus3 );
}
const tiny_rom_entry *bbc_opusa_device::device_rom_region() const
{
return ROM_NAME( opusa );
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// bbc_opus3_device - constructor
//-------------------------------------------------
bbc_opus3_device::bbc_opus3_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, const XTAL &clock)
: device_t(mconfig, type, tag, owner, clock)
, device_bbc_1mhzbus_interface(mconfig, *this)
, m_ramdisk(*this, "ramdisk")
, m_fdc(*this, "wd1770")
, m_floppy(*this, "wd1770:%u", 0)
, m_ramdisk_page(0)
{
}
bbc_opus3_device::bbc_opus3_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock)
: bbc_opus3_device(mconfig, BBC_OPUS3, tag, owner, clock)
{
}
bbc_opusa_device::bbc_opusa_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock)
: bbc_opus3_device(mconfig, BBC_OPUSA, tag, owner, clock)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void bbc_opus3_device::device_start()
{
}
void bbc_opusa_device::device_start()
{
}
//**************************************************************************
// IMPLEMENTATION
//**************************************************************************
uint8_t bbc_opus3_device::fred_r(offs_t offset)
{
uint8_t data = 0xff;
switch (offset)
{
case 0xf8:
case 0xf9:
case 0xfa:
case 0xfb:
data = m_fdc->read(offset & 0x03);
break;
}
return data;
}
void bbc_opus3_device::fred_w(offs_t offset, uint8_t data)
{
floppy_image_device *floppy = nullptr;
switch (offset)
{
case 0xf8:
case 0xf9:
case 0xfa:
case 0xfb:
m_fdc->write(offset & 0x03, data);
break;
case 0xfc:
// bit 1, 2: drive select
if (BIT(data, 1)) floppy = m_floppy[0]->get_device();
if (BIT(data, 2)) floppy = m_floppy[1]->get_device();
m_fdc->set_floppy(floppy);
// bit 0: side select
if (floppy)
floppy->ss_w(BIT(data, 0));
// bit 4: motor enable (always set)
// bit 5: density
m_fdc->dden_w(BIT(data, 5));
break;
case 0xfe:
m_ramdisk_page = (m_ramdisk_page & 0x00ff) | (data << 8);
break;
case 0xff:
m_ramdisk_page = (m_ramdisk_page & 0xff00) | (data << 0);
break;
}
}
uint8_t bbc_opus3_device::jim_r(offs_t offset)
{
if ((m_ramdisk_page << 8) < m_ramdisk->size())
return m_ramdisk->read((m_ramdisk_page << 8) + offset);
else
return 0xff;
}
void bbc_opus3_device::jim_w(offs_t offset, uint8_t data)
{
if ((m_ramdisk_page << 8) < m_ramdisk->size())
m_ramdisk->write((m_ramdisk_page << 8) + offset, data);
}
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