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-rw-r--r--src/devices/bus/a2bus/a2swyft.cpp149
1 files changed, 149 insertions, 0 deletions
diff --git a/src/devices/bus/a2bus/a2swyft.cpp b/src/devices/bus/a2bus/a2swyft.cpp
new file mode 100644
index 00000000000..38be337e8ba
--- /dev/null
+++ b/src/devices/bus/a2bus/a2swyft.cpp
@@ -0,0 +1,149 @@
+// license:BSD-3-Clause
+// copyright-holders:R. Belmont
+/*********************************************************************
+
+ a2swyft.c
+
+ Implementation of the IAI SwyftCard
+
+*********************************************************************/
+
+#include "emu.h"
+#include "includes/apple2.h"
+#include "a2swyft.h"
+
+
+/***************************************************************************
+ PARAMETERS
+***************************************************************************/
+
+//**************************************************************************
+// GLOBAL VARIABLES
+//**************************************************************************
+
+const device_type A2BUS_SWYFT = &device_creator<a2bus_swyft_device>;
+
+#define SWYFT_ROM_REGION "swyft_rom"
+
+ROM_START( swyft )
+ ROM_REGION(0x4000, SWYFT_ROM_REGION, 0)
+ ROM_LOAD( "840-003a.bin", 0x000000, 0x004000, CRC(5d6673e9) SHA1(1554bd03c536789f0ff7d1ef6c992265e311935d) )
+ ROM_REGION(0x1000, "pal16r4", 0)
+ ROM_LOAD( "swyft_pal16r4.jed", 0x0000, 0x08EF, CRC(462a6938) SHA1(38be885539cf91423a246378c411ac8b2f150ec6) ) // swyft3.pal derived by D. Elvey, works as a replacement pal (original is protected?)
+ROM_END
+
+//-------------------------------------------------
+// rom_region - device-specific ROM region
+//-------------------------------------------------
+
+const rom_entry *a2bus_swyft_device::device_rom_region() const
+{
+ return ROM_NAME( swyft );
+}
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+a2bus_swyft_device::a2bus_swyft_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, A2BUS_SWYFT, "IAI SwyftCard", tag, owner, clock, "a2swyft", __FILE__),
+ device_a2bus_card_interface(mconfig, *this)
+{
+}
+
+a2bus_swyft_device::a2bus_swyft_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source) :
+ device_t(mconfig, type, name, tag, owner, clock, shortname, source),
+ device_a2bus_card_interface(mconfig, *this)
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void a2bus_swyft_device::device_start()
+{
+ // set_a2bus_device makes m_slot valid
+ set_a2bus_device();
+
+ m_rom = device().machine().root_device().memregion(this->subtag(SWYFT_ROM_REGION).c_str())->base();
+
+ save_item(NAME(m_rombank));
+}
+
+void a2bus_swyft_device::device_reset()
+{
+ m_rombank = 0;
+
+ m_inh_state = INH_READ; // read-enable the ROM
+ recalc_slot_inh();
+}
+
+UINT8 a2bus_swyft_device::read_c0nx(address_space &space, UINT8 offset)
+{
+ switch (offset)
+ {
+ case 0:
+ m_rombank = 0;
+ m_inh_state = INH_READ;
+ recalc_slot_inh();
+ break;
+
+ case 1:
+ m_rombank = 0;
+ m_inh_state = INH_NONE;
+ recalc_slot_inh();
+ break;
+
+ case 2:
+ m_rombank = 0x1000;
+ m_inh_state = INH_READ;
+ recalc_slot_inh();
+ break;
+ }
+
+ return 0xff;
+}
+
+void a2bus_swyft_device::write_c0nx(address_space &space, UINT8 offset, UINT8 data)
+{
+ switch (offset)
+ {
+ case 0:
+ m_rombank = 0;
+ m_inh_state = INH_READ;
+ recalc_slot_inh();
+ break;
+
+ case 1:
+ m_rombank = 0;
+ m_inh_state = INH_NONE;
+ recalc_slot_inh();
+ break;
+
+ case 2:
+ m_rombank = 0x1000;
+ m_inh_state = INH_READ;
+ recalc_slot_inh();
+ break;
+ }
+}
+
+UINT8 a2bus_swyft_device::read_inh_rom(address_space &space, UINT16 offset)
+{
+ offset -= 0xd000;
+
+ if (offset < 0x1000) // banked area d000-dfff
+ {
+ return m_rom[offset + m_rombank];
+ }
+ else // fixed area e000-ffff
+ {
+ return m_rom[offset - 0x1000 + 0x2000];
+ }
+}
+
+int a2bus_swyft_device::inh_type()
+{
+ return m_inh_state;
+}