diff options
Diffstat (limited to 'src/emu/bus/x68k/x68k_neptunex.c')
-rw-r--r-- | src/emu/bus/x68k/x68k_neptunex.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/src/emu/bus/x68k/x68k_neptunex.c b/src/emu/bus/x68k/x68k_neptunex.c new file mode 100644 index 00000000000..fb6fcf4bff7 --- /dev/null +++ b/src/emu/bus/x68k/x68k_neptunex.c @@ -0,0 +1,152 @@ +/* + * 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>; + +static const dp8390_interface neptune_dp8390_interface = { + DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, x68k_neptune_device, x68k_neptune_irq_w), + DEVCB_NULL, + DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, x68k_neptune_device, x68k_neptune_mem_read), + DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, x68k_neptune_device, x68k_neptune_mem_write) +}; + + +// device machine config +static MACHINE_CONFIG_FRAGMENT( x68k_neptunex ) + MCFG_DP8390D_ADD("dp8390d", neptune_dp8390_interface) +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("ne2000: 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("ne2000: 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("ne2000: 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("ne2000: 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); +} |