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-rw-r--r--src/devices/bus/tanbus/radisc.cpp213
1 files changed, 213 insertions, 0 deletions
diff --git a/src/devices/bus/tanbus/radisc.cpp b/src/devices/bus/tanbus/radisc.cpp
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index 00000000000..383a8b0d1bb
--- /dev/null
+++ b/src/devices/bus/tanbus/radisc.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+ Ralph Allen Disc Controller Card
+
+ http://www.microtan.ukpc.net/6809/DOS_RTC.pdf
+
+**********************************************************************/
+
+
+#include "emu.h"
+#include "radisc.h"
+#include "speaker.h"
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE(TANBUS_RADISC, tanbus_radisc_device, "tanbus_radisc", "Ralph Allen Disc Controller Card")
+
+//-------------------------------------------------
+// MACHINE_DRIVER( radisc )
+//-------------------------------------------------
+
+static void tandos_floppies(device_slot_interface &device)
+{
+ device.option_add("525sssd", FLOPPY_525_SSSD);
+ device.option_add("525sd", FLOPPY_525_SD);
+ device.option_add("525qd", FLOPPY_525_QD);
+}
+
+//-------------------------------------------------
+// device_add_mconfig - add device configuration
+//-------------------------------------------------
+
+void tanbus_radisc_device::device_add_mconfig(machine_config &config)
+{
+ INPUT_MERGER_ANY_HIGH(config, m_irq_line).output_handler().set(FUNC(tanbus_radisc_device::fdc_irq_w));
+
+ FD1793(config, m_fdc, 4_MHz_XTAL / 4);
+ m_fdc->intrq_wr_callback().set(m_irq_line, FUNC(input_merger_device::in_w<IRQ_FDC>));
+ m_fdc->drq_wr_callback().set(FUNC(tanbus_radisc_device::fdc_drq_w));
+ m_fdc->hld_wr_callback().set(FUNC(tanbus_radisc_device::fdc_hld_w));
+ m_fdc->set_force_ready(true);
+
+ FLOPPY_CONNECTOR(config, m_floppies[0], tandos_floppies, "525qd", floppy_image_device::default_floppy_formats).enable_sound(true);
+ FLOPPY_CONNECTOR(config, m_floppies[1], tandos_floppies, "525qd", floppy_image_device::default_floppy_formats).enable_sound(true);
+ FLOPPY_CONNECTOR(config, m_floppies[2], tandos_floppies, nullptr, floppy_image_device::default_floppy_formats).enable_sound(true);
+ FLOPPY_CONNECTOR(config, m_floppies[3], tandos_floppies, nullptr, floppy_image_device::default_floppy_formats).enable_sound(true);
+
+ MC146818(config, m_rtc, 32.768_kHz_XTAL);
+ m_rtc->irq().set(m_irq_line, FUNC(input_merger_device::in_w<IRQ_RTC>));
+
+ VIA6522(config, m_via, 4_MHz_XTAL / 4);
+ m_via->irq_handler().set(m_irq_line, FUNC(input_merger_device::in_w<IRQ_VIA>));
+
+ /* audio hardware */
+ SPEAKER(config, "mono").front_center();
+ BEEP(config, m_beeper, 1000); // TODO: unknown frequency
+ m_beeper->add_route(ALL_OUTPUTS, "mono", 1.0);
+}
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// tanbus_radisc_device - constructor
+//-------------------------------------------------
+
+tanbus_radisc_device::tanbus_radisc_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+ : device_t(mconfig, TANBUS_RADISC, tag, owner, clock)
+ , device_tanbus_interface(mconfig, *this)
+ , m_fdc(*this, "fdc")
+ , m_floppies(*this, "fdc:%u", 0)
+ , m_floppy(nullptr)
+ , m_rtc(*this, "rtc")
+ , m_via(*this, "via")
+ , m_irq_line(*this, "irq_line")
+ , m_beeper(*this, "beeper")
+ , m_beeper_state(0)
+ , m_drive_control(0)
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void tanbus_radisc_device::device_start()
+{
+}
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void tanbus_radisc_device::device_reset()
+{
+}
+
+//-------------------------------------------------
+// read - card read
+//-------------------------------------------------
+
+uint8_t tanbus_radisc_device::read(offs_t offset, int inhrom, int inhram, int be)
+{
+ uint8_t data = 0xff;
+
+ switch (offset)
+ {
+ case 0xbf80: case 0xbf81: case 0xbf82: case 0xbf83: case 0xbf84: case 0xbf85: case 0xbf86: case 0xbf87: case 0xbf88: case 0xbf89: case 0xbf8a: case 0xbf8b: case 0xbf8c: case 0xbf8d: case 0xbf8e: case 0xbf8f:
+ data = m_via->read(offset & 0x0f);
+ break;
+ case 0xbf90: case 0xbf91: case 0xbf92: case 0xbf93:
+ data = m_fdc->read(offset & 0x03);
+ break;
+ case 0xbf94:
+ data = control_r();
+ break;
+ case 0xbf98: case 0xbf99:
+ data = m_rtc->read(offset & 0x01);
+ break;
+ }
+
+ return data;
+}
+
+//-------------------------------------------------
+// write - card write
+//-------------------------------------------------
+
+void tanbus_radisc_device::write(offs_t offset, uint8_t data, int inhrom, int inhram, int be)
+{
+ switch (offset)
+ {
+ case 0xbf80: case 0xbf81: case 0xbf82: case 0xbf83: case 0xbf84: case 0xbf85: case 0xbf86: case 0xbf87: case 0xbf88: case 0xbf89: case 0xbf8a: case 0xbf8b: case 0xbf8c: case 0xbf8d: case 0xbf8e: case 0xbf8f:
+ m_via->write(offset & 0x0f, data);
+ break;
+ case 0xbf90: case 0xbf91: case 0xbf92: case 0xbf93:
+ m_fdc->write(offset & 0x03, data);
+ break;
+ case 0xbf94:
+ control_w(data);
+ break;
+ case 0xbf95:
+ m_beeper_state ^= 1;
+ m_beeper->set_state(m_beeper_state);
+ break;
+ case 0xbf98: case 0xbf99:
+ m_rtc->write(offset & 0x01, data);
+ break;
+ }
+}
+
+//**************************************************************************
+// IMPLEMENTATION
+//**************************************************************************
+
+void tanbus_radisc_device::control_w(uint8_t val)
+{
+ logerror("control_w %02x\n", val);
+ m_drive_control = val;
+
+ // bit 0: irq enable
+ m_irq_enable = BIT(val, 0);
+
+ // bit 1: data select (data stream controller)
+
+ // bit 2, 3: drive select
+ m_floppy = m_floppies[(val >> 2) & 0x03]->get_device();
+ m_fdc->set_floppy(m_floppy);
+
+ // bit 4: side select
+ if (m_floppy)
+ m_floppy->ss_w(BIT(val, 4));
+
+ // bit 5: density
+ m_fdc->dden_w(BIT(val, 5));
+
+ // bit 6: head load
+ if (m_floppy)
+ m_floppy->mon_w(BIT(val, 6));
+
+ // bit 7: drq enable
+ m_drq_enable = BIT(val, 7);
+}
+
+uint8_t tanbus_radisc_device::control_r()
+{
+ logerror("control_r %02x\n", m_drive_control);
+ return m_drive_control;
+}
+
+WRITE_LINE_MEMBER(tanbus_radisc_device::fdc_drq_w)
+{
+ m_tanbus->so_w((m_drq_enable && state) ? ASSERT_LINE : CLEAR_LINE);
+}
+
+WRITE_LINE_MEMBER(tanbus_radisc_device::fdc_irq_w)
+{
+ m_tanbus->irq_w((m_irq_enable && state) ? ASSERT_LINE : CLEAR_LINE);
+}
+
+WRITE_LINE_MEMBER(tanbus_radisc_device::fdc_hld_w)
+{
+ logerror("fdc_hld_w %d\n", state);
+ if (m_floppy)
+ m_floppy->mon_w(state);
+}