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apple2: add new files for CMS SCSI II card [R. Belmont, Apple II Documentation Project]
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src/devices/bus/a2bus/cmsscsi.cpp
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247
src/devices/bus/a2bus/cmsscsi.cpp
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// license:BSD-3-Clause
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// copyright-holders:R. Belmont
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/*********************************************************************
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cmsscsi.cpp
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Implementation of the CMS Apple II SCSI Card
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Details:
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ROM is $2000 bytes. The last $800 bytes are 7 slot images at
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offset (slot*$100). There is no slot 0 image, naturally, so $1800-$18FF
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is blank.
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The other $1800 bytes of the ROM are banked at $C800. The first $80
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bytes at $C800 are the first $80 bytes of the 2K SRAM chip regardless
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of the ROM bank setting. This also means the first $80 bytes of each
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ROM bank are inaccessible. (Most of the SRAM is also inaccessible)
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$C0(n+8)X space:
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$0-$7: NCR5380 registers
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$8: Appears to control SCSI delay time. 1 is shortest, 0 is longest ($FF is second longest, etc)
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$9: ROM bank at $C800 in the low 2 bits.
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$A: read/write to the DMA data register on the 5380
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$B, $C, $D, $E: the jumpers on the card. Not sure yet which is which.
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$F: Card will not boot if it doesn't return 0.
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*********************************************************************/
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#include "emu.h"
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#include "cmsscsi.h"
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#include "bus/nscsi/devices.h"
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/***************************************************************************
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PARAMETERS
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***************************************************************************/
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//**************************************************************************
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// GLOBAL VARIABLES
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//**************************************************************************
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DEFINE_DEVICE_TYPE(A2BUS_CMSSCSI, a2bus_cmsscsi_device, "cmsscsi", "CMS Apple II SCSI Card")
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#define SCSI_ROM_REGION "scsi_rom"
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#define SCSI_BUS_TAG "scsibus"
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#define SCSI_5380_TAG "scsibus:7:ncr5380"
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ROM_START( scsi )
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ROM_REGION(0x4000, SCSI_ROM_REGION, 0)
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ROM_DEFAULT_BIOS("cms3190")
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ROM_SYSTEM_BIOS( 0, "cms3190", "CMS SCSI BIOS dated 3-1-90" )
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ROMX_LOAD( "cms scsi ii interface card rom 3-1-90.bin", 0x000000, 0x002000, CRC(9452cc76) SHA1(b981ce644dde479c22d2ba270d472fe3b5d7f3e9), ROM_BIOS(0) )
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ROM_SYSTEM_BIOS( 1, "cms871109", "CMS SCSI BIOS dated 1987-11-09" )
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ROMX_LOAD( "cms 1987-11-09 scsi.bin", 0x000000, 0x002000, CRC(89d1d917) SHA1(f6028f6f2b16250950297e2ff5317ce463006796), ROM_BIOS(1) )
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ROM_END
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/***************************************************************************
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FUNCTION PROTOTYPES
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***************************************************************************/
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//-------------------------------------------------
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// device_add_mconfig - add device configuration
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//-------------------------------------------------
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void a2bus_cmsscsi_device::device_add_mconfig(machine_config &config)
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{
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NSCSI_BUS(config, m_scsibus);
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NSCSI_CONNECTOR(config, "scsibus:0", default_scsi_devices, nullptr, false);
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NSCSI_CONNECTOR(config, "scsibus:1", default_scsi_devices, nullptr, false);
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NSCSI_CONNECTOR(config, "scsibus:2", default_scsi_devices, nullptr, false);
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NSCSI_CONNECTOR(config, "scsibus:3", default_scsi_devices, nullptr, false);
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NSCSI_CONNECTOR(config, "scsibus:4", default_scsi_devices, nullptr, false);
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NSCSI_CONNECTOR(config, "scsibus:5", default_scsi_devices, nullptr, false);
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NSCSI_CONNECTOR(config, "scsibus:6", default_scsi_devices, "harddisk", false);
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NSCSI_CONNECTOR(config, "scsibus:7").option_set("ncr5380", NCR5380N);
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}
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//-------------------------------------------------
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// rom_region - device-specific ROM region
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//-------------------------------------------------
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const tiny_rom_entry *a2bus_cmsscsi_device::device_rom_region() const
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{
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return ROM_NAME( scsi );
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}
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//**************************************************************************
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// LIVE DEVICE
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//**************************************************************************
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a2bus_cmsscsi_device::a2bus_cmsscsi_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) :
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device_t(mconfig, type, tag, owner, clock),
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device_a2bus_card_interface(mconfig, *this),
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m_ncr5380(*this, SCSI_5380_TAG),
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m_scsibus(*this, SCSI_BUS_TAG), m_rom(nullptr), m_rombank(0)
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{
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}
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a2bus_cmsscsi_device::a2bus_cmsscsi_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
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a2bus_cmsscsi_device(mconfig, A2BUS_CMSSCSI, tag, owner, clock)
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{
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}
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//-------------------------------------------------
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// device_start - device-specific startup
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//-------------------------------------------------
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void a2bus_cmsscsi_device::device_start()
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{
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m_rom = device().machine().root_device().memregion(this->subtag(SCSI_ROM_REGION).c_str())->base();
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memset(m_ram, 0, 2048);
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save_item(NAME(m_ram));
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save_item(NAME(m_rombank));
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}
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void a2bus_cmsscsi_device::device_reset()
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{
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m_rombank = 0;
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}
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/*-------------------------------------------------
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read_c0nx - called for reads from this card's c0nx space
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-------------------------------------------------*/
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uint8_t a2bus_cmsscsi_device::read_c0nx(uint8_t offset)
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{
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switch (offset)
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{
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case 0:
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case 1:
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case 2:
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case 3:
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case 4:
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case 5:
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case 6:
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case 7:
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// logerror("Read 5380 @ %x\n", offset);
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return m_ncr5380->read(offset);
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case 8: // appears to be delay time
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return 1;
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case 0xa: // read and DACK
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return m_ncr5380->dma_r();
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case 0xb: //
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return 0x1;
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case 0xc: //
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return 0x1;
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case 0xd: //
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return 0x1;
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case 0xe: //
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return 0x1;
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case 0xf: // must be 0 to boot
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return 0;
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default:
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printf("Read c0n%x (%s)\n", offset, machine().describe_context().c_str());
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break;
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}
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return 0xff;
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}
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/*-------------------------------------------------
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write_c0nx - called for writes to this card's c0nx space
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-------------------------------------------------*/
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void a2bus_cmsscsi_device::write_c0nx(uint8_t offset, uint8_t data)
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{
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switch (offset)
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{
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case 0:
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case 1:
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case 2:
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case 3:
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case 4:
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case 5:
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case 6:
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case 7:
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// logerror("%02x to 5380 reg %x\n", data, offset);
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m_ncr5380->write(offset, data);
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break;
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case 9:
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m_rombank = (data & 3) * 0x800;
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//printf("ROM bank to %x\n", m_rombank);
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break;
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case 0xa: // write and DACK
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m_ncr5380->dma_w(data);
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break;
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default:
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logerror("Write %02x to c0n%x (%s)\n", data, offset, machine().describe_context().c_str());
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break;
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}
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}
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/*-------------------------------------------------
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read_cnxx - called for reads from this card's cnxx space
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-------------------------------------------------*/
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uint8_t a2bus_cmsscsi_device::read_cnxx(uint8_t offset)
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{
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// slot images at $1800 + (slot * 100)
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return m_rom[offset + (slotno() * 0x100) + 0x1800];
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}
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void a2bus_cmsscsi_device::write_cnxx(uint8_t offset, uint8_t data)
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{
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// there are writes to cn0A, possibly misguided C0nA (bank select?) writes?
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// logerror("Write %02x to cn%02x (%s)\n", data, offset, machine().describe_context());
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}
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/*-------------------------------------------------
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read_c800 - called for reads from this card's c800 space
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-------------------------------------------------*/
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uint8_t a2bus_cmsscsi_device::read_c800(uint16_t offset)
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{
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if (offset < 0x80)
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{
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return m_ram[offset];
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}
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return m_rom[offset + m_rombank];
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}
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/*-------------------------------------------------
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write_c800 - called for writes to this card's c800 space
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-------------------------------------------------*/
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void a2bus_cmsscsi_device::write_c800(uint16_t offset, uint8_t data)
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{
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if (offset < 0x80)
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{
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m_ram[offset] = data;
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}
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}
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61
src/devices/bus/a2bus/cmsscsi.h
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61
src/devices/bus/a2bus/cmsscsi.h
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@ -0,0 +1,61 @@
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// license:BSD-3-Clause
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// copyright-holders:R. Belmont
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/*********************************************************************
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cmsscsi.h
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Implementation of the CMS Apple II SCSI Card
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*********************************************************************/
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#ifndef MAME_BUS_A2BUS_CMSSCSI_H
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#define MAME_BUS_A2BUS_CMSSCSI_H
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#pragma once
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#include "a2bus.h"
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#include "machine/ncr5380n.h"
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//**************************************************************************
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// TYPE DEFINITIONS
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//**************************************************************************
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class a2bus_cmsscsi_device:
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public device_t,
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public device_a2bus_card_interface
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{
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public:
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// construction/destruction
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a2bus_cmsscsi_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
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DECLARE_WRITE_LINE_MEMBER( drq_w );
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protected:
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a2bus_cmsscsi_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);
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virtual void device_start() override;
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virtual void device_reset() override;
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virtual void device_add_mconfig(machine_config &config) override;
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virtual const tiny_rom_entry *device_rom_region() const override;
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// overrides of standard a2bus slot functions
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virtual uint8_t read_c0nx(uint8_t offset) override;
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virtual void write_c0nx(uint8_t offset, uint8_t data) override;
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virtual uint8_t read_cnxx(uint8_t offset) override;
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virtual void write_cnxx(uint8_t offset, uint8_t data) override;
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virtual uint8_t read_c800(uint16_t offset) override;
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virtual void write_c800(uint16_t offset, uint8_t data) override;
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required_device<ncr5380n_device> m_ncr5380;
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required_device<nscsi_bus_device> m_scsibus;
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private:
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uint8_t *m_rom;
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uint8_t m_ram[2048]; // 2K SRAM chip on the card, only 128 bytes are used?
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int m_rombank;
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};
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// device type definition
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DECLARE_DEVICE_TYPE(A2BUS_CMSSCSI, a2bus_cmsscsi_device)
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#endif // MAME_BUS_A2BUS_CMSSCSI_H
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