summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/einstein/pipe/silicon_disc.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/devices/bus/einstein/pipe/silicon_disc.cpp')
-rw-r--r--src/devices/bus/einstein/pipe/silicon_disc.cpp119
1 files changed, 119 insertions, 0 deletions
diff --git a/src/devices/bus/einstein/pipe/silicon_disc.cpp b/src/devices/bus/einstein/pipe/silicon_disc.cpp
new file mode 100644
index 00000000000..354ada1c594
--- /dev/null
+++ b/src/devices/bus/einstein/pipe/silicon_disc.cpp
@@ -0,0 +1,119 @@
+// license: GPL-2.0+
+// copyright-holders: Dirk Best
+/***************************************************************************
+
+ Silicon Disc
+
+***************************************************************************/
+
+#include "emu.h"
+#include "silicon_disc.h"
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE(EINSTEIN_SILICON_DISC, einstein_silicon_disc_device, "einstein_sd", "Einstein Silicon Disc")
+
+//-------------------------------------------------
+// device_address_map
+//-------------------------------------------------
+
+DEVICE_ADDRESS_MAP_START(map, 8, einstein_silicon_disc_device)
+ AM_RANGE(0x08, 0x08) AM_MIRROR(0xff00) AM_WRITE(sector_low_w)
+ AM_RANGE(0x09, 0x09) AM_MIRROR(0xff00) AM_WRITE(sector_high_w)
+ADDRESS_MAP_END
+
+//-------------------------------------------------
+// rom_region - device-specific ROM region
+//-------------------------------------------------
+
+ROM_START( silicon_disc )
+ ROM_REGION(0x2000, "rom", 0)
+ ROM_LOAD("sd11.bin", 0x0000, 0x2000, CRC(0e4f5e6d) SHA1(d0bc01e533d8963c596154435c5b2d156a96d470))
+ROM_END
+
+const tiny_rom_entry *einstein_silicon_disc_device::device_rom_region() const
+{
+ return ROM_NAME( silicon_disc );
+}
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// einstein_silicon_disc_device - constructor
+//-------------------------------------------------
+
+einstein_silicon_disc_device::einstein_silicon_disc_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+ device_t(mconfig, EINSTEIN_SILICON_DISC, tag, owner, clock),
+ device_tatung_pipe_interface(mconfig, *this),
+ m_rom(*this, "rom"),
+ m_bios(*this, ":bios"),
+ m_sector(0)
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void einstein_silicon_disc_device::device_start()
+{
+ // setup ram
+ m_ram = std::make_unique<uint8_t[]>(0x40000);
+ memset(m_ram.get(), 0xff, 0x40000);
+
+ // register for save states
+ save_pointer(NAME(m_ram.get()), 0x40000);
+ save_item(NAME(m_sector));
+}
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void einstein_silicon_disc_device::device_reset()
+{
+ // copy our rom into the main bios region so it will get picked up by the bank switching
+ // not really part of the pipe interface cartridge but here for convenience, in reality
+ // the rom gets put directly onto the main motherboard into the second empty socket
+ memcpy(m_bios->base() + 0x4000, m_rom->base(), 0x2000);
+
+ // install i/o ports
+ io_space().install_device(0xf0, 0xff, *this, &einstein_silicon_disc_device::map);
+ io_space().install_readwrite_handler(0xfa, 0xfa, 0, 0, 0xff00,
+ read8_delegate(FUNC(einstein_silicon_disc_device::ram_r), this),
+ write8_delegate(FUNC(einstein_silicon_disc_device::ram_w), this));
+}
+
+
+//**************************************************************************
+// IMPLEMENTATION
+//**************************************************************************
+
+WRITE8_MEMBER( einstein_silicon_disc_device::sector_low_w )
+{
+ m_sector &= 0xff00;
+ m_sector |= data;
+}
+
+WRITE8_MEMBER( einstein_silicon_disc_device::sector_high_w )
+{
+ m_sector &= 0x00ff;
+ m_sector |= ((data & 0x07) << 8);
+}
+
+// a8 to a14 are used to specify the byte in a 128-byte sector
+READ8_MEMBER( einstein_silicon_disc_device::ram_r )
+{
+ return m_ram[(m_sector * 0x80) | ((offset >> 8) & 0x7f)];
+}
+
+WRITE8_MEMBER( einstein_silicon_disc_device::ram_w )
+{
+ m_ram[(m_sector * 0x80) | ((offset >> 8) & 0x7f)] = data;
+}