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-rw-r--r--src/mess/machine/a2hsscsi.c326
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diff --git a/src/mess/machine/a2hsscsi.c b/src/mess/machine/a2hsscsi.c
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-/*********************************************************************
-
- 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);
-}