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author | 2013-10-22 16:45:06 +0000 | |
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committer | 2013-10-22 16:45:06 +0000 | |
commit | cd6f73b9c7a6a8b8ee734051cf4ae9fabff477da (patch) | |
tree | 49ff21880abf2d678c4b297fbf12115973af8bf7 /src/emu/bus/a2bus/a2applicard.c | |
parent | ef774dd504626acb2e7648ada9ea8d8783937795 (diff) |
(MESS) Apple II bus moving day (nw)
Diffstat (limited to 'src/emu/bus/a2bus/a2applicard.c')
-rw-r--r-- | src/emu/bus/a2bus/a2applicard.c | 284 |
1 files changed, 284 insertions, 0 deletions
diff --git a/src/emu/bus/a2bus/a2applicard.c b/src/emu/bus/a2bus/a2applicard.c new file mode 100644 index 00000000000..c568f1085d5 --- /dev/null +++ b/src/emu/bus/a2bus/a2applicard.c @@ -0,0 +1,284 @@ +/********************************************************************* + + a2applicard.c + + Implementation of the PCPI AppliCard Z-80 card + + Unlike the SoftCard and clones, this has its own 64k of RAM on board + and the Z80 runs completely independently of the host's 6502. + +*********************************************************************/ + +#include "a2applicard.h" +#include "includes/apple2.h" +#include "cpu/z80/z80.h" +#include "machine/z80ctc.h" + +/*************************************************************************** + PARAMETERS +***************************************************************************/ + +//************************************************************************** +// GLOBAL VARIABLES +//************************************************************************** + +const device_type A2BUS_APPLICARD = &device_creator<a2bus_applicard_device>; + +#define Z80_TAG "z80" +#define Z80_ROM_REGION "z80_rom" + +static ADDRESS_MAP_START( z80_mem, AS_PROGRAM, 8, a2bus_applicard_device ) + AM_RANGE(0x0000, 0xffff) AM_READWRITE(dma_r, dma_w) +ADDRESS_MAP_END + +static ADDRESS_MAP_START( z80_io, AS_IO, 8, a2bus_applicard_device ) + AM_RANGE(0x00, 0x60) AM_MIRROR(0xff00) AM_READWRITE(z80_io_r, z80_io_w) +ADDRESS_MAP_END + +MACHINE_CONFIG_FRAGMENT( a2applicard ) + MCFG_CPU_ADD(Z80_TAG, Z80, 6000000) // Z80 runs at 6 MHz + MCFG_CPU_PROGRAM_MAP(z80_mem) + MCFG_CPU_IO_MAP(z80_io) +MACHINE_CONFIG_END + +ROM_START( a2applicard ) + ROM_REGION(0x800, Z80_ROM_REGION, 0) + ROM_LOAD( "applicard-v9.bin", 0x000000, 0x000800, CRC(1d461000) SHA1(71d633be864b6084362e85108a4e600cbe6e44fe) ) +ROM_END + +/*************************************************************************** + FUNCTION PROTOTYPES +***************************************************************************/ + +//------------------------------------------------- +// machine_config_additions - device-specific +// machine configurations +//------------------------------------------------- + +machine_config_constructor a2bus_applicard_device::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( a2applicard ); +} + +//------------------------------------------------- +// device_rom_region - device-specific ROMs +//------------------------------------------------- + +const rom_entry *a2bus_applicard_device::device_rom_region() const +{ + return ROM_NAME( a2applicard ); +} + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +a2bus_applicard_device::a2bus_applicard_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), + m_z80(*this, Z80_TAG) +{ +} + +a2bus_applicard_device::a2bus_applicard_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, A2BUS_APPLICARD, "PCPI Applicard", tag, owner, clock, "a2aplcrd", __FILE__), + device_a2bus_card_interface(mconfig, *this), + m_z80(*this, Z80_TAG) +{ +} + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void a2bus_applicard_device::device_start() +{ + // set_a2bus_device makes m_slot valid + set_a2bus_device(); + + // locate Z80 ROM + astring tempstring; + m_z80rom = device().machine().root_device().memregion(this->subtag(tempstring, Z80_ROM_REGION))->base(); + + save_item(NAME(m_bROMAtZ80Zero)); + save_item(NAME(m_z80stat)); + save_item(NAME(m_6502stat)); + save_item(NAME(m_toz80)); + save_item(NAME(m_to6502)); + save_item(NAME(m_z80ram)); + + memset(m_z80ram, 0, 64*1024); +} + +void a2bus_applicard_device::device_reset() +{ + m_bROMAtZ80Zero = true; +} + +UINT8 a2bus_applicard_device::read_c0nx(address_space &space, UINT8 offset) +{ + switch (offset & 0xf) + { + case 0: + m_6502stat = false; + return m_to6502; + + case 1: + return m_toz80; + + case 2: + if (m_z80stat) + { + return 0x80; + } + return false; + + case 3: + if (m_6502stat) + { + return 0x80; + } + return false; + + case 5: + m_bROMAtZ80Zero = true; + m_toz80 = false; + m_to6502 = false; + m_z80->reset(); + break; + + case 6: // IRQ on Z80 via CTC channel 3 (CP/M doesn't use the CTC or IRQs) + fatalerror("Applicard: Z80 IRQ not supported yet\n"); + break; + + case 7: // NMI on Z80 (direct) + m_z80->set_input_line(INPUT_LINE_NMI, PULSE_LINE); + break; + + } + return 0xff; +} + +void a2bus_applicard_device::write_c0nx(address_space &space, UINT8 offset, UINT8 data) +{ + switch (offset & 0xf) + { + case 0: // are these legal to write? + case 2: + case 3: + break; + + case 1: + m_z80stat = true; + m_toz80 = data; + break; + + case 5: + case 6: + case 7: + read_c0nx(space, offset); // let the read handler take care of these + break; + } +} + +READ8_MEMBER( a2bus_applicard_device::z80_io_r ) +{ + UINT8 tmp = 0; + + switch (offset) + { + case 0: + return m_to6502; + + case 0x20: + m_z80stat = false; + return m_toz80; + + case 0x40: + if (m_z80stat) + { + tmp |= 0x80; + } + if (m_6502stat) + { + tmp |= 1; + } + return tmp; + + case 0x60: + break; + } + return 0xff; +} + +WRITE8_MEMBER( a2bus_applicard_device::z80_io_w ) +{ + switch (offset) + { + case 0: + m_to6502 = data; + m_6502stat = true; + break; + + case 0x60: + if (data & 1) + { + m_bROMAtZ80Zero = true; + } + else + { + m_bROMAtZ80Zero = false; + } + break; + } +} + +//------------------------------------------------- +// dma_r - +//------------------------------------------------- + +READ8_MEMBER( a2bus_applicard_device::dma_r ) +{ + if (offset < 0x8000) + { + if (m_bROMAtZ80Zero) + { + return m_z80rom[offset & 0x7ff]; + } + else + { + return m_z80ram[offset]; + } + } + else + { + return m_z80ram[offset]; + } + return 0xff; +} + + +//------------------------------------------------- +// dma_w - +//------------------------------------------------- + +WRITE8_MEMBER( a2bus_applicard_device::dma_w ) +{ + if (offset < 0x8000) + { + // writing only works if ROM not mapped from 0-7fff + if (!m_bROMAtZ80Zero) + { + m_z80ram[offset] = data; + } + } + else + { + m_z80ram[offset] = data; + } +} + +bool a2bus_applicard_device::take_c800() +{ + return false; +} |