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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/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_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_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);
}
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