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Diffstat (limited to 'src/devices/bus/isa/asc88.cpp')
-rw-r--r--src/devices/bus/isa/asc88.cpp184
1 files changed, 184 insertions, 0 deletions
diff --git a/src/devices/bus/isa/asc88.cpp b/src/devices/bus/isa/asc88.cpp
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+++ b/src/devices/bus/isa/asc88.cpp
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+// license:BSD-3-Clause
+// copyright-holders:AJR
+/***************************************************************************
+
+ ASC-88 SCSI Adapter
+ © 1985 Advanced Storage Concepts, Inc.
+
+***************************************************************************/
+
+#include "emu.h"
+#include "asc88.h"
+
+#include "machine/nscsi_bus.h"
+#include "machine/nscsi_hd.h"
+
+
+DEFINE_DEVICE_TYPE(ASC88, asc88_device, "asc88", "ASC-88 SCSI Adapter")
+
+
+asc88_device::asc88_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+ : device_t(mconfig, ASC88, tag, owner, clock)
+ , device_isa8_card_interface(mconfig, *this)
+ , m_scsic(*this, "scsi:7:scsic")
+ , m_eeprom(*this, "eeprom")
+ , m_baseaddr(*this, "BASEADDR")
+ , m_control(0)
+ , m_irq(false)
+ , m_drq(false)
+{
+}
+
+void asc88_device::device_start()
+{
+ set_isa_device();
+
+ m_ram = make_unique_clear<u8[]>(0x800);
+
+ save_item(NAME(m_control));
+ save_item(NAME(m_irq));
+ save_item(NAME(m_drq));
+ save_pointer(NAME(m_ram), 0x800);
+}
+
+void asc88_device::device_reset()
+{
+ const offs_t baseaddr = 0xc0000 | (u32(m_baseaddr->read()) << 14);
+ m_isa->install_rom(this, baseaddr, baseaddr | 0x37ff, "asc88", "bios");
+ m_isa->install_bank(baseaddr | 0x3800, baseaddr | 0x3fef, "ascram", m_ram.get());
+ m_isa->install_memory(baseaddr | 0x3ff0, baseaddr | 0x3ff7,
+ read8sm_delegate(FUNC(ncr5380n_device::read), &*m_scsic),
+ write8sm_delegate(FUNC(ncr5380n_device::write), &*m_scsic));
+ m_isa->install_memory(baseaddr | 0x3ff8, baseaddr | 0x3ff8,
+ read8smo_delegate(FUNC(asc88_device::eeprom_r), this),
+ write8smo_delegate(FUNC(asc88_device::control_w), this));
+
+ control_w(0);
+}
+
+WRITE_LINE_MEMBER(asc88_device::irq_w)
+{
+ if (m_irq != state)
+ {
+ m_irq = state;
+ if (BIT(m_control, 3))
+ m_isa->irq2_w(state);
+ if (BIT(m_control, 4))
+ m_isa->irq3_w(state);
+ if (BIT(m_control, 5))
+ m_isa->irq5_w(state);
+ }
+}
+
+WRITE_LINE_MEMBER(asc88_device::drq_w)
+{
+ if (m_drq != state)
+ {
+ m_drq = state;
+ if (BIT(m_control, 6))
+ m_isa->drq1_w(state);
+ if (BIT(m_control, 7))
+ m_isa->drq3_w(state);
+ }
+}
+
+u8 asc88_device::dack_r(int line)
+{
+ return m_scsic->dma_r();
+}
+
+void asc88_device::dack_w(int line, u8 data)
+{
+ m_scsic->dma_w(data);
+}
+
+void asc88_device::control_w(u8 data)
+{
+ const u8 changing_bits = data ^ m_control;
+ m_control = data;
+
+ m_eeprom->di_write(BIT(data, 0));
+ m_eeprom->clk_write(BIT(data, 1));
+ m_eeprom->cs_write(BIT(data, 2));
+
+ if (m_irq)
+ {
+ if (BIT(m_control, 3))
+ m_isa->irq2_w(BIT(data, 3));
+ if (BIT(m_control, 4))
+ m_isa->irq3_w(BIT(data, 4));
+ if (BIT(m_control, 5))
+ m_isa->irq5_w(BIT(data, 5));
+ }
+
+ if (m_drq)
+ {
+ if (BIT(changing_bits, 6))
+ m_isa->drq1_w(BIT(data, 6));
+ if (BIT(changing_bits, 7))
+ m_isa->drq3_w(BIT(data, 7));
+ }
+}
+
+u8 asc88_device::eeprom_r()
+{
+ return m_eeprom->do_read();
+}
+
+static INPUT_PORTS_START(asc88)
+ PORT_START("BASEADDR")
+ PORT_DIPNAME(0x7, 0x3, "BIOS Segment Address") PORT_DIPLOCATION("A16-A14:!1,!2,!3")
+ // For each jumper, pins 1 & 2 closed = off (0); pins 2 & 3 closed = on (1)
+ PORT_DIPSETTING(0x0, "C000h")
+ PORT_DIPSETTING(0x1, "C400h")
+ PORT_DIPSETTING(0x2, "C800h")
+ PORT_DIPSETTING(0x3, "CC00h")
+ PORT_DIPSETTING(0x4, "D000h")
+ PORT_DIPSETTING(0x5, "D400h")
+ PORT_DIPSETTING(0x6, "D800h")
+ PORT_DIPSETTING(0x7, "DC00h")
+INPUT_PORTS_END
+
+ioport_constructor asc88_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME(asc88);
+}
+
+static void asc88_scsi_devices(device_slot_interface &device)
+{
+ device.option_add("harddisk", NSCSI_HARDDISK);
+ device.option_add_internal("scsic", NCR5380N);
+}
+
+void asc88_device::scsic_config(device_t *device)
+{
+ device->set_clock(10'000'000); // FIXME: this clock is fake
+ downcast<ncr5380n_device &>(*device).irq_handler().set("^^", FUNC(asc88_device::irq_w));
+ downcast<ncr5380n_device &>(*device).drq_handler().set("^^", FUNC(asc88_device::drq_w));
+}
+
+void asc88_device::device_add_mconfig(machine_config &config)
+{
+ NSCSI_BUS(config, "scsi");
+ NSCSI_CONNECTOR(config, "scsi:0", asc88_scsi_devices, nullptr);
+ NSCSI_CONNECTOR(config, "scsi:1", asc88_scsi_devices, nullptr);
+ NSCSI_CONNECTOR(config, "scsi:2", asc88_scsi_devices, nullptr);
+ NSCSI_CONNECTOR(config, "scsi:3", asc88_scsi_devices, nullptr);
+ NSCSI_CONNECTOR(config, "scsi:4", asc88_scsi_devices, nullptr);
+ NSCSI_CONNECTOR(config, "scsi:5", asc88_scsi_devices, nullptr);
+ NSCSI_CONNECTOR(config, "scsi:6", asc88_scsi_devices, nullptr);
+ NSCSI_CONNECTOR(config, "scsi:7", asc88_scsi_devices, "scsic", true)
+ .set_option_machine_config("scsic", [this] (device_t *device) { scsic_config(device); });
+
+ EEPROM_93C06_16BIT(config, m_eeprom); // NMC9306N
+}
+
+ROM_START(asc88)
+ ROM_REGION(0x3800, "bios", ROMREGION_ERASE00)
+ ROM_LOAD("asc88_rev._4.0n_14-nov-91.u14", 0x0000, 0x2000, CRC(8657d1bf) SHA1(49c44aafbb3f28478e4b5eeaa208b147fdf253b9)) // TMS27C64-IJL
+ROM_END
+
+const tiny_rom_entry *asc88_device::device_rom_region() const
+{
+ return ROM_NAME(asc88);
+}