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Diffstat (limited to 'src/devices/bus/x68k/x68k_neptunex.cpp')
-rw-r--r--src/devices/bus/x68k/x68k_neptunex.cpp149
1 files changed, 149 insertions, 0 deletions
diff --git a/src/devices/bus/x68k/x68k_neptunex.cpp b/src/devices/bus/x68k/x68k_neptunex.cpp
new file mode 100644
index 00000000000..affb3ead65c
--- /dev/null
+++ b/src/devices/bus/x68k/x68k_neptunex.cpp
@@ -0,0 +1,149 @@
+// license:BSD-3-Clause
+// copyright-holders:Barry Rodewald
+/*
+ * x68k_neptunex.c
+ */
+
+#include "emu.h"
+#include "machine/dp8390.h"
+#include "x68k_neptunex.h"
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type X68K_NEPTUNEX = &device_creator<x68k_neptune_device>;
+
+// device machine config
+static MACHINE_CONFIG_FRAGMENT( x68k_neptunex )
+ MCFG_DEVICE_ADD("dp8390d", DP8390D, 0)
+ MCFG_DP8390D_IRQ_CB(WRITELINE(x68k_neptune_device, x68k_neptune_irq_w))
+ MCFG_DP8390D_MEM_READ_CB(READ8(x68k_neptune_device, x68k_neptune_mem_read))
+ MCFG_DP8390D_MEM_WRITE_CB(WRITE8(x68k_neptune_device, x68k_neptune_mem_write))
+MACHINE_CONFIG_END
+
+machine_config_constructor x68k_neptune_device::device_mconfig_additions() const
+{
+ return MACHINE_CONFIG_NAME( x68k_neptunex );
+}
+
+x68k_neptune_device::x68k_neptune_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : device_t(mconfig, X68K_NEPTUNEX, "Neptune-X", tag, owner, clock, "x68k_neptunex", __FILE__),
+ device_x68k_expansion_card_interface(mconfig, *this),
+ m_dp8390(*this, "dp8390d")
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void x68k_neptune_device::device_start()
+{
+ device_t* cpu = machine().device("maincpu");
+ char mac[7];
+ UINT32 num = rand();
+ address_space& space = cpu->memory().space(AS_PROGRAM);
+ m_slot = dynamic_cast<x68k_expansion_slot_device *>(owner());
+ memset(m_prom, 0x57, 16);
+ sprintf(mac+2, "\x1b%c%c%c", (num >> 16) & 0xff, (num >> 8) & 0xff, num & 0xff);
+ mac[0] = 0; mac[1] = 0; // avoid gcc warning
+ memcpy(m_prom, mac, 6);
+ m_dp8390->set_mac(mac);
+ space.install_readwrite_handler(0xece000,0xece3ff,read16_delegate(FUNC(x68k_neptune_device::x68k_neptune_port_r),this),write16_delegate(FUNC(x68k_neptune_device::x68k_neptune_port_w),this),0xffffffff);
+}
+
+void x68k_neptune_device::device_reset() {
+ memcpy(m_prom, m_dp8390->get_mac(), 6);
+}
+
+READ16_MEMBER(x68k_neptune_device::x68k_neptune_port_r)
+{
+ UINT16 data;
+
+ if(offset >= 0x100+32 || offset < 0x100)
+ return 0xffff;
+ if(offset < 0x100+16)
+ {
+ m_dp8390->dp8390_cs(CLEAR_LINE);
+ return (m_dp8390->dp8390_r(space, offset, 0xff) << 8)|
+ m_dp8390->dp8390_r(space, offset+1, 0xff);
+ }
+ //if(mem_mask == 0x00ff) offset++;
+ switch(offset)
+ {
+ case 0x100+16:
+ m_dp8390->dp8390_cs(ASSERT_LINE);
+ data = m_dp8390->dp8390_r(space, offset, mem_mask);
+ data = ((data & 0x00ff) << 8) | ((data & 0xff00) >> 8);
+ return data;
+ case 0x100+31:
+ m_dp8390->dp8390_reset(CLEAR_LINE);
+ return 0;
+ default:
+ logerror("x68k_neptune: invalid register read %02X\n", offset);
+ }
+ return 0;
+}
+
+WRITE16_MEMBER(x68k_neptune_device::x68k_neptune_port_w)
+{
+ if(offset >= 0x100+32 || offset < 0x100)
+ return;
+ if(offset < 0x100+16)
+ {
+ m_dp8390->dp8390_cs(CLEAR_LINE);
+ if(mem_mask == 0x00ff)
+ {
+ data <<= 8;
+ offset++;
+ }
+ m_dp8390->dp8390_w(space, offset, data>>8, 0xff);
+ if(mem_mask == 0xffff) m_dp8390->dp8390_w(space, offset+1, data & 0xff, 0xff);
+ return;
+ }
+ //if(mem_mask == 0x00ff) offset++;
+ switch(offset)
+ {
+ case 0x100+16:
+ m_dp8390->dp8390_cs(ASSERT_LINE);
+ data = ((data & 0x00ff) << 8) | ((data & 0xff00) >> 8);
+ m_dp8390->dp8390_w(space, offset, data, mem_mask);
+ return;
+ case 0x100+31:
+ m_dp8390->dp8390_reset(ASSERT_LINE);
+ return;
+ default:
+ logerror("x68k_neptune: invalid register write %02X\n", offset);
+ }
+ return;
+}
+
+READ8_MEMBER(x68k_neptune_device::x68k_neptune_mem_read)
+{
+ if(offset < 32) return m_prom[offset>>1];
+ if((offset < (16*1024)) || (offset >= (32*1024)))
+ {
+ logerror("x68k_neptune: invalid memory read %04X\n", offset);
+ return 0xff;
+ }
+ return m_board_ram[offset - (16*1024)];
+}
+
+WRITE8_MEMBER(x68k_neptune_device::x68k_neptune_mem_write)
+{
+ if((offset < (16*1024)) || (offset >= (32*1024)))
+ {
+ logerror("x68k_neptune: invalid memory write %04X\n", offset);
+ return;
+ }
+ m_board_ram[offset - (16*1024)] = data;
+}
+
+WRITE_LINE_MEMBER(x68k_neptune_device::x68k_neptune_irq_w)
+{
+ machine().device("maincpu")->execute().set_input_line_vector(2, NEPTUNE_IRQ_VECTOR);
+ m_slot->irq2_w(state);
+ logerror("Neptune: IRQ2 set to %i\n",state);
+}