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Diffstat (limited to 'src/mess/machine/a2hsscsi.c')
-rw-r--r-- | src/mess/machine/a2hsscsi.c | 326 |
1 files changed, 0 insertions, 326 deletions
diff --git a/src/mess/machine/a2hsscsi.c b/src/mess/machine/a2hsscsi.c deleted file mode 100644 index 3c74d555371..00000000000 --- a/src/mess/machine/a2hsscsi.c +++ /dev/null @@ -1,326 +0,0 @@ -/********************************************************************* - - a2hsscsi.c - - Implementation of the Apple II High Speed SCSI Card - - This uses an ASIC called "Sandwich II"; the card itself is - sometimes known as "Cocoon". - - Notes: - C0n0-C0n7 = NCR5380 registers in normal order - C0n8 = DMA address low - C0n9 = DMA address high - C0nA = DMA count low - C0nB = DMA count high - C0nC = DMA control - C0nD = Enable DMA / reset 5380 - C0nE = Priority (read bits 5-7) / Fire watchdog (write bit 7) / RAM bank (write bits 0-3) - C0nF = DMA speed (bit 7 = 0 for fast, 1 for slow) / ROM bank (write bits 0-4) - - DMA control register (C0nC): - 0x01 = pseudo-DMA enable - 0x02 = DMA enable - 0x04 = test mode - 0x08 = disable stop-DMA-on-IRQ - 0x10 = DMA direction (read only) - 0x20 = 5380 IRQ enable - 0x40 = system DMA status (read only) - 0x80 = DMA stopped due to IRQ - - Enable DMA / reset 5380 register (C0nD): - 0x01 = Resume DMA after rollover or IRQ - 0x02 = Reset the 5380 - 0x40 = Clear test mode - 0x80 = Set test mode - -*********************************************************************/ - -#include "a2hsscsi.h" -#include "includes/apple2.h" -#include "machine/scsibus.h" -#include "machine/nscsi_cd.h" -#include "machine/nscsi_hd.h" - -/*************************************************************************** - PARAMETERS -***************************************************************************/ - -//************************************************************************** -// GLOBAL VARIABLES -//************************************************************************** - -const device_type A2BUS_HSSCSI = &device_creator<a2bus_hsscsi_device>; - -#define SCSI_ROM_REGION "scsi_rom" -#define SCSI_BUS_TAG "scsibus" -#define SCSI_5380_TAG "scsibus:7:ncr5380" - -static MACHINE_CONFIG_FRAGMENT( ncr5380 ) - MCFG_DEVICE_MODIFY(DEVICE_SELF) - MCFG_DEVICE_CLOCK(10000000) - MCFG_NCR5380N_DRQ_HANDLER(DEVWRITELINE("^^", a2bus_hsscsi_device, drq_w)) -MACHINE_CONFIG_END - -static SLOT_INTERFACE_START( hsscsi_devices ) - SLOT_INTERFACE("cdrom", NSCSI_CDROM) - SLOT_INTERFACE("harddisk", NSCSI_HARDDISK) - SLOT_INTERFACE_INTERNAL("ncr5380", NCR5380N) -SLOT_INTERFACE_END - -static MACHINE_CONFIG_FRAGMENT( hsscsi ) - MCFG_SCSIBUS_ADD("scsi") - MCFG_NSCSI_BUS_ADD(SCSI_BUS_TAG) - MCFG_NSCSI_ADD("scsibus:0", hsscsi_devices, 0, false) - MCFG_NSCSI_ADD("scsibus:1", hsscsi_devices, 0, false) - MCFG_NSCSI_ADD("scsibus:2", hsscsi_devices, 0, false) - MCFG_NSCSI_ADD("scsibus:3", hsscsi_devices, 0, false) - MCFG_NSCSI_ADD("scsibus:4", hsscsi_devices, 0, false) - MCFG_NSCSI_ADD("scsibus:5", hsscsi_devices, 0, false) - MCFG_NSCSI_ADD("scsibus:6", hsscsi_devices, "harddisk", false) - MCFG_NSCSI_ADD("scsibus:7", hsscsi_devices, "ncr5380", true) - MCFG_DEVICE_CARD_MACHINE_CONFIG("ncr5380", ncr5380) -MACHINE_CONFIG_END - -ROM_START( hsscsi ) - ROM_REGION(0x8000, SCSI_ROM_REGION, 0) - ROM_LOAD( "341-0803.bin", 0x0000, 0x8000, CRC(2c15618b) SHA1(7d32227299933bfc1b7f8bc2062906fdfe530674) ) -ROM_END - -/*************************************************************************** - FUNCTION PROTOTYPES -***************************************************************************/ - -//------------------------------------------------- -// machine_config_additions - device-specific -// machine configurations -//------------------------------------------------- - -machine_config_constructor a2bus_hsscsi_device::device_mconfig_additions() const -{ - return MACHINE_CONFIG_NAME( hsscsi ); -} - -//------------------------------------------------- -// rom_region - device-specific ROM region -//------------------------------------------------- - -const rom_entry *a2bus_hsscsi_device::device_rom_region() const -{ - return ROM_NAME( hsscsi ); -} - -//************************************************************************** -// LIVE DEVICE -//************************************************************************** - -a2bus_hsscsi_device::a2bus_hsscsi_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_ncr5380(*this, SCSI_5380_TAG), - m_scsibus(*this, SCSI_BUS_TAG) -{ -} - -a2bus_hsscsi_device::a2bus_hsscsi_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : - device_t(mconfig, A2BUS_HSSCSI, "Apple II High-Speed SCSI Card", tag, owner, clock, "a2hsscsi", __FILE__), - device_a2bus_card_interface(mconfig, *this), - m_ncr5380(*this, SCSI_5380_TAG), - m_scsibus(*this, SCSI_BUS_TAG) -{ -} - -//------------------------------------------------- -// device_start - device-specific startup -//------------------------------------------------- - -void a2bus_hsscsi_device::device_start() -{ - // set_a2bus_device makes m_slot valid - set_a2bus_device(); - - astring tempstring; - m_rom = device().machine().root_device().memregion(this->subtag(tempstring, SCSI_ROM_REGION))->base(); - - memset(m_ram, 0, 8192); - - save_item(NAME(m_ram)); - save_item(NAME(m_rambank)); - save_item(NAME(m_rombank)); - save_item(NAME(m_bank)); - save_item(NAME(m_drq)); - save_item(NAME(m_816block)); -} - -void a2bus_hsscsi_device::device_reset() -{ - m_rambank = 0; - m_rombank = 0; - m_c0ne = m_c0nf = 0; - m_816block = false; -} - - -/*------------------------------------------------- - read_c0nx - called for reads from this card's c0nx space --------------------------------------------------*/ - -UINT8 a2bus_hsscsi_device::read_c0nx(address_space &space, UINT8 offset) -{ - switch (offset) - { - case 0: - case 1: - case 2: - case 3: - case 4: - case 5: - case 6: - case 7: -// printf("Read 5380 @ %x\n", offset); - return m_ncr5380->read(space, offset); - break; - - case 0xc: - return 0x00; // indicate watchdog? - - case 0xe: // code at cf32 wants to RMW this without killing the ROM bank - return m_c0ne; - - case 0xf: - return m_c0nf; - - default: - printf("Read c0n%x (PC=%x)\n", offset, space.device().safe_pc()); - break; - } - - return 0xff; -} - - -/*------------------------------------------------- - write_c0nx - called for writes to this card's c0nx space --------------------------------------------------*/ - -void a2bus_hsscsi_device::write_c0nx(address_space &space, UINT8 offset, UINT8 data) -{ - switch (offset) - { - case 0: - case 1: - case 2: - case 3: - case 4: - case 5: - case 6: - case 7: -// printf("%02x to 5380 reg %x\n", data, offset); - m_ncr5380->write(space, offset, data); - break; -#if 0 - case 8: // DMA address low - break; - - case 9: // DMA address high - break; - - case 0xa: // DMA count low - break; - - case 0xb: // DMA count high - break; - - case 0xc: // DMA control - break; -#endif - - case 0xd: // DMA enable / reset - printf("%02x to DMA enable/reset\n", data); - if (data & 0x2) - { - // printf("Resetting SCSI: %02x at %x\n", data, space.device().safe_pc()); - m_ncr5380->reset(); - } - break; - - case 0xe: - m_c0ne = data; - m_rombank = (data & 0x1f) * 0x400; - printf("c0ne to %x (ROM bank %x)\n", data & 0x1f, m_rombank); - break; - - case 0xf: - m_c0nf = data; - m_rambank = (data & 0x7) * 0x400; - printf("c0nf to %x (RAM bank %x)\n", data & 0x7, m_rambank); - break; - - default: - printf("Write %02x to c0n%x (PC=%x)\n", data, offset, space.device().safe_pc()); - break; - } -} - -/*------------------------------------------------- - read_cnxx - called for reads from this card's cnxx space --------------------------------------------------*/ - -UINT8 a2bus_hsscsi_device::read_cnxx(address_space &space, UINT8 offset) -{ - // one slot image at the start of the ROM, it appears - return m_rom[offset]; -} - -void a2bus_hsscsi_device::write_cnxx(address_space &space, UINT8 offset, UINT8 data) -{ -// printf("Write %02x to cn%02x (PC=%x)\n", data, offset, space.device().safe_pc()); -} - -/*------------------------------------------------- - read_c800 - called for reads from this card's c800 space --------------------------------------------------*/ - -UINT8 a2bus_hsscsi_device::read_c800(address_space &space, UINT16 offset) -{ - // bankswitched RAM at c800-cbff - // bankswitched ROM at cc00-cfff - if (offset < 0x400) - { -// printf("Read RAM at %x = %02x\n", offset+m_rambank, m_ram[offset + m_rambank]); - if (m_816block) - { - return m_ncr5380->dma_r(); - } - - return m_ram[offset + m_rambank]; - } - else - { - return m_rom[(offset-0x400) + m_rombank]; - } -} - -/*------------------------------------------------- - write_c800 - called for writes to this card's c800 space --------------------------------------------------*/ -void a2bus_hsscsi_device::write_c800(address_space &space, UINT16 offset, UINT8 data) -{ - if (offset < 0x400) - { -// printf("%02x to RAM at %x\n", data, offset+m_rambank); - if (m_816block) - { - m_ncr5380->dma_w(data); - } - else - { - m_ram[offset + m_rambank] = data; - } - } -} - -WRITE_LINE_MEMBER( a2bus_hsscsi_device::drq_w ) -{ - m_drq = (state ? 0x80 : 0x00); -} |