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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************
Acorn SCSI Host Adaptor
Known SCSI controller boards used:
Adaptec ACB-4000A
Known SCSI devices using adaptor:
SCSI ID 0 - Acorn Winchester 110: Seagate ST412 + Adaptec ACB-4000A
Acorn Winchester 120: NEC D5126 + Adaptec ACB-4000A
Acorn Winchester 130: Rodime R0203E + Adaptec ACB-4000A
SCSI ID 1 - Digistore Tape Streamer: Archive 2060S
Compatible 3rd party Winchesters using Akhter Host Adaptor:
Technomatic 20MB: Seagate ST225 + Adaptec ACB-4070
Technomatic 30MB:
Technomatic 40MB:
Additional notes:
The Digistore used a modified Acorn Host Adaptor, it re-mapped
the device to &FC44-47, from &FC40-43. This allows both the
Digistore and Winchester to co-exist.
Useful CHD parameters:
10MB -chs 306,4,33 -ss=256
20MB -chs 612,4,33 -ss=256
30MB -chs 640,6,33 -ss=256
512MB -chs 3971,16,33 -ss 256
TODO:
- test formatting, may require specific ACB-4000A commands.
**********************************************************************/
#include "emu.h"
#include "scsi.h"
#include "machine/nscsi_bus.h"
#include "bus/nscsi/devices.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(BBC_SCSI, bbc_scsi_device, "bbc_scsi", "Acorn SCSI Host Adaptor");
DEFINE_DEVICE_TYPE(BBC_AWHD, bbc_awhd_device, "bbc_awhd", "Acorn Winchester Disc");
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void bbc_scsi_device::device_add_mconfig(machine_config& config)
{
NSCSI_BUS(config, "scsi");
NSCSI_CONNECTOR(config, "scsi:0", default_scsi_devices, nullptr);
NSCSI_CONNECTOR(config, "scsi:1", default_scsi_devices, nullptr);
NSCSI_CONNECTOR(config, "scsi:7", default_scsi_devices, "scsicb", true)
.option_add_internal("scsicb", NSCSI_CB)
.machine_config([this](device_t* device) {
downcast<nscsi_callback_device&>(*device).bsy_callback().set(*this, FUNC(bbc_scsi_device::bsy_w));
downcast<nscsi_callback_device&>(*device).req_callback().set(*this, FUNC(bbc_scsi_device::req_w));
});
}
void bbc_awhd_device::device_add_mconfig(machine_config &config)
{
bbc_scsi_device::device_add_mconfig(config);
/* Adaptec ACB-4000A */
subdevice<nscsi_connector>("scsi:0")->set_default_option("harddisk");
subdevice<nscsi_connector>("scsi:0")->set_fixed(true);
BBC_1MHZBUS_SLOT(config, m_1mhzbus, DERIVED_CLOCK(1, 1), bbc_1mhzbus_devices, nullptr);
m_1mhzbus->irq_handler().set(m_1mhzbus, FUNC(bbc_1mhzbus_slot_device::irq_w));
m_1mhzbus->nmi_handler().set(m_1mhzbus, FUNC(bbc_1mhzbus_slot_device::nmi_w));
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// bbc_scsi_device - constructor
//-------------------------------------------------
bbc_scsi_device::bbc_scsi_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, type, tag, owner, clock)
, device_bbc_1mhzbus_interface(mconfig, *this)
, m_scsi(*this, "scsi:7:scsicb")
{
}
bbc_scsi_device::bbc_scsi_device(const machine_config& mconfig, const char* tag, device_t* owner, uint32_t clock)
: bbc_scsi_device(mconfig, BBC_SCSI, tag, owner, clock)
{
}
bbc_awhd_device::bbc_awhd_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: bbc_scsi_device(mconfig, BBC_AWHD, tag, owner, clock)
, m_1mhzbus(*this, "1mhzbus")
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void bbc_scsi_device::device_start()
{
/* register for save states */
save_item(NAME(m_irq_enable));
save_item(NAME(m_irq_state));
}
//**************************************************************************
// IMPLEMENTATION
//**************************************************************************
uint8_t bbc_scsi_device::fred_r(offs_t offset)
{
uint8_t data = 0xff;
switch (offset)
{
case 0x40:
data = m_scsi->read();
m_scsi->ack_w(1);
break;
case 0x41:
data = (m_scsi->msg_r() << 0)
| (m_scsi->bsy_r() << 1)
| (m_irq_state << 4)
| (m_scsi->req_r() << 5)
| (m_scsi->io_r() << 6)
| (m_scsi->cd_r() << 7);
break;
}
return data;
}
void bbc_scsi_device::fred_w(offs_t offset, uint8_t data)
{
switch (offset)
{
case 0x40:
m_scsi->write(data);
m_scsi->ack_w(1);
break;
case 0x42:
m_scsi->sel_w(1);
break;
case 0x43:
m_irq_enable = BIT(data, 0);
break;
}
}
WRITE_LINE_MEMBER(bbc_scsi_device::bsy_w)
{
m_scsi->sel_w(0);
}
WRITE_LINE_MEMBER(bbc_scsi_device::req_w)
{
m_scsi->ack_w(0);
m_irq_state = (m_irq_enable && !state) ? 0 : 1;
m_slot->irq_w(m_irq_state ? CLEAR_LINE : ASSERT_LINE);
}
uint8_t bbc_awhd_device::fred_r(offs_t offset)
{
uint8_t data = 0xff;
data &= bbc_scsi_device::fred_r(offset);
data &= m_1mhzbus->fred_r(offset);
return data;
}
void bbc_awhd_device::fred_w(offs_t offset, uint8_t data)
{
bbc_scsi_device::fred_w(offset, data);
m_1mhzbus->fred_w(offset, data);
}
uint8_t bbc_awhd_device::jim_r(offs_t offset)
{
return m_1mhzbus->jim_r(offset);
}
void bbc_awhd_device::jim_w(offs_t offset, uint8_t data)
{
m_1mhzbus->jim_w(offset, data);
}
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