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-rw-r--r--src/devices/bus/nabupc/fdc.cpp167
1 files changed, 167 insertions, 0 deletions
diff --git a/src/devices/bus/nabupc/fdc.cpp b/src/devices/bus/nabupc/fdc.cpp
new file mode 100644
index 00000000000..7c7b1740e2d
--- /dev/null
+++ b/src/devices/bus/nabupc/fdc.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Brian Johnson
+/*******************************************************************
+ *
+ * NABU PC FDC Card
+ *
+ *******************************************************************/
+
+#include "emu.h"
+#include "fdc.h"
+
+#include "imagedev/floppy.h"
+#include "machine/wd_fdc.h"
+
+#include "formats/nabupc_dsk.h"
+
+
+//**************************************************************************
+// NABU PC FDC DEVICE
+//**************************************************************************
+namespace {
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+/* NABU PC FDC Device */
+
+class fdc_device : public device_t, public bus::nabupc::device_option_expansion_interface
+{
+public:
+ // construction/destruction
+ fdc_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+ virtual uint8_t read(offs_t offset) override;
+ virtual void write(offs_t offset, uint8_t data) override;
+protected:
+ // device-level overrides
+ virtual void device_start() override ATTR_COLD;
+ virtual void device_reset() override ATTR_COLD;
+
+ // optional information overrides
+ virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
+
+private:
+ void ds_w(uint8_t data);
+
+ static void floppy_formats(format_registration &fr);
+
+ required_device<wd2797_device> m_wd2797;
+ required_device_array<floppy_connector, 2> m_floppies;
+};
+
+
+static void nabu_fdc_drives(device_slot_interface &device)
+{
+ device.option_add("525dd", FLOPPY_525_DD);
+ device.option_add("35dd", FLOPPY_35_DD);
+}
+
+//-------------------------------------------------
+// fdc_device - constructor
+//-------------------------------------------------
+fdc_device::fdc_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+ device_t(mconfig, NABUPC_OPTION_FDC, tag, owner, clock),
+ device_option_expansion_interface(mconfig, *this),
+ m_wd2797(*this, "fdc"),
+ m_floppies(*this, "fdc:%u", 0)
+{
+}
+
+//-------------------------------------------------
+// device_add_mconfig - device-specific config
+//-------------------------------------------------
+void fdc_device::device_add_mconfig(machine_config &config)
+{
+ WD2797(config, m_wd2797, 4_MHz_XTAL / 4).set_force_ready(true);
+ FLOPPY_CONNECTOR(config, m_floppies[0], nabu_fdc_drives, "525dd", fdc_device::floppy_formats);
+ FLOPPY_CONNECTOR(config, m_floppies[1], nabu_fdc_drives, "525dd", fdc_device::floppy_formats);
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+void fdc_device::device_start()
+{
+}
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+void fdc_device::device_reset()
+{
+ m_wd2797->set_floppy(nullptr);
+ m_wd2797->dden_w(0);
+}
+
+//-------------------------------------------------
+// supported floppy formats
+//-------------------------------------------------
+void fdc_device::floppy_formats(format_registration &fr)
+{
+ fr.add(FLOPPY_NABUPC_FORMAT);
+}
+
+//-------------------------------------------------
+// ds_w - write to drive select/density register
+//-------------------------------------------------
+void fdc_device::ds_w(uint8_t data)
+{
+ m_wd2797->dden_w(BIT(data, 0));
+
+ floppy_image_device *floppy = nullptr;
+
+ if (BIT(data, 1)) floppy = m_floppies[0]->get_device();
+ if (BIT(data, 2)) floppy = m_floppies[1]->get_device();
+
+ m_wd2797->set_floppy(floppy);
+
+ for (auto& fdd : m_floppies)
+ {
+ floppy_image_device *floppy = fdd->get_device();
+ if (floppy)
+ {
+ floppy->mon_w((data & 6) ? 0 : 1);
+ }
+ }
+}
+
+uint8_t fdc_device::read(offs_t offset)
+{
+ uint8_t result;
+
+ switch(offset) {
+ case 0x00:
+ case 0x01:
+ case 0x02:
+ case 0x03:
+ result = m_wd2797->read(offset);
+ break;
+ case 0x0F:
+ result = 0x10;
+ break;
+ default:
+ result = 0xFF;
+ }
+ return result;
+}
+
+void fdc_device::write(offs_t offset, uint8_t data)
+{
+ switch(offset) {
+ case 0x00:
+ case 0x01:
+ case 0x02:
+ case 0x03:
+ m_wd2797->write(offset, data);
+ break;
+ case 0x0F:
+ ds_w(data);
+ break;
+ }
+}
+
+} // anonymous namespace
+
+DEFINE_DEVICE_TYPE_PRIVATE(NABUPC_OPTION_FDC, bus::nabupc::device_option_expansion_interface, fdc_device, "nabupc_option_fdc", "NABU PC Floppy Controller")