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-rw-r--r--src/devices/bus/electron/cart/peg400.cpp178
1 files changed, 178 insertions, 0 deletions
diff --git a/src/devices/bus/electron/cart/peg400.cpp b/src/devices/bus/electron/cart/peg400.cpp
new file mode 100644
index 00000000000..a6f3398ff33
--- /dev/null
+++ b/src/devices/bus/electron/cart/peg400.cpp
@@ -0,0 +1,178 @@
+// license:BSD-3-Clause
+// copyright-holders:Nigel Barnes
+/**********************************************************************
+
+ Slogger Pegasus 400 disk interface
+
+**********************************************************************/
+
+
+#include "emu.h"
+#include "peg400.h"
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE(ELECTRON_PEG400, electron_peg400_device, "electron_peg400", "Slogger Pegasus 400 disk interface")
+
+
+//-------------------------------------------------
+// MACHINE_DRIVER( peg400 )
+//-------------------------------------------------
+
+FLOPPY_FORMATS_MEMBER(electron_peg400_device::floppy_formats)
+ FLOPPY_ACORN_SSD_FORMAT,
+ FLOPPY_ACORN_DSD_FORMAT,
+ FLOPPY_ACORN_ADFS_OLD_FORMAT
+FLOPPY_FORMATS_END0
+
+SLOT_INTERFACE_START(peg400_floppies)
+ SLOT_INTERFACE("35dd", FLOPPY_35_DD)
+ SLOT_INTERFACE("525qd", FLOPPY_525_QD)
+SLOT_INTERFACE_END
+
+//-------------------------------------------------
+// device_add_mconfig - add device configuration
+//-------------------------------------------------
+
+MACHINE_CONFIG_START(electron_peg400_device::device_add_mconfig)
+ /* fdc */
+ MCFG_WD1770_ADD("fdc", 16_MHz_XTAL / 2)
+ MCFG_WD_FDC_DRQ_CALLBACK(WRITELINE(electron_peg400_device, fdc_drq_w))
+ MCFG_FLOPPY_DRIVE_ADD("fdc:0", peg400_floppies, "525qd", electron_peg400_device::floppy_formats)
+ MCFG_FLOPPY_DRIVE_SOUND(true)
+ MCFG_FLOPPY_DRIVE_ADD("fdc:1", peg400_floppies, nullptr, electron_peg400_device::floppy_formats)
+ MCFG_FLOPPY_DRIVE_SOUND(true)
+MACHINE_CONFIG_END
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// electron_peg400_device - constructor
+//-------------------------------------------------
+
+electron_peg400_device::electron_peg400_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+ : device_t(mconfig, ELECTRON_PEG400, tag, owner, clock)
+ , device_electron_cart_interface(mconfig, *this)
+ , m_fdc(*this, "fdc")
+ , m_floppy0(*this, "fdc:0")
+ , m_floppy1(*this, "fdc:1")
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void electron_peg400_device::device_start()
+{
+}
+
+//-------------------------------------------------
+// read - cartridge data read
+//-------------------------------------------------
+
+uint8_t electron_peg400_device::read(address_space &space, offs_t offset, int infc, int infd, int romqa)
+{
+ uint8_t data = 0xff;
+
+ if (infc)
+ {
+ switch (offset & 0xff)
+ {
+ case 0xc0:
+ data = m_drive_control;
+ break;
+ case 0xc4:
+ case 0xc5:
+ case 0xc6:
+ case 0xc7:
+ data = m_fdc->read(space, offset & 0x03);
+ break;
+ }
+ }
+
+ if (!infc && !infd)
+ {
+ if (offset >= 0x0000 && offset < 0x4000)
+ {
+ data = m_rom[(offset & 0x3fff) + (romqa * 0x4000)];
+ }
+
+ if (romqa == 0 && offset >= 0x3800 && offset < 0x4000)
+ {
+ data = m_ram[offset & 0x07ff];
+ }
+ }
+
+ return data;
+}
+
+//-------------------------------------------------
+// write - cartridge data write
+//-------------------------------------------------
+
+void electron_peg400_device::write(address_space &space, offs_t offset, uint8_t data, int infc, int infd, int romqa)
+{
+ if (infc)
+ {
+ switch (offset & 0xff)
+ {
+ case 0xc0:
+ wd1770_control_w(space, 0, data);
+ break;
+ case 0xc4:
+ case 0xc5:
+ case 0xc6:
+ case 0xc7:
+ m_fdc->write(space, offset & 0x03, data);
+ break;
+ }
+ }
+
+ if (!infc && !infd)
+ {
+ if (offset >= 0x3800 && offset < 0x4000)
+ {
+ m_ram[offset & 0x07ff] = data;
+ }
+ }
+}
+
+
+//**************************************************************************
+// IMPLEMENTATION
+//**************************************************************************
+
+WRITE8_MEMBER(electron_peg400_device::wd1770_control_w)
+{
+ floppy_image_device *floppy = nullptr;
+
+ m_drive_control = data;
+
+ // bit 0, 1: drive select
+ if (BIT(data, 0)) floppy = m_floppy0->get_device();
+ if (BIT(data, 1)) floppy = m_floppy1->get_device();
+ m_fdc->set_floppy(floppy);
+
+ // bit 2: side select
+ if (floppy)
+ floppy->ss_w(BIT(data, 2));
+
+ // bit 3: density
+ m_fdc->dden_w(BIT(data, 3));
+
+ // bit 4: send DRQ to NMI signal
+ m_fdc_ie = BIT(data, 4);
+
+ // bit 5: head load
+}
+
+WRITE_LINE_MEMBER(electron_peg400_device::fdc_drq_w)
+{
+ m_slot->nmi_w((state && m_fdc_ie) ? ASSERT_LINE : CLEAR_LINE);
+}