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|
// license:LGPL-2.1+
// copyright-holders:Michael Zapf
/****************************************************************************
SCSI adapter card
designed and realized by Western Horizon Technologies
Latest two revisions:
Rev F: using logic circuits and a PAL for decoding
Rev G: using a PLD custom chip
This is an emulation of the WHTech SCSI adapter. It has been modified over
the years in various ways, in particular to get it working with the Geneve
9640, and to enable word transfers. This modification was only effective
on the Geneve because the TMS9995 uses an even/odd word transfer, while the
TI-99/4A console uses an odd/even word transfer (see datamux.cpp), hence
swapping the bytes from the controller. An additional SWPB operation would
have been required which would have slowed down the transfer, so there would
not have be a measurable performance gain. Accordingly, the DSR (firmware)
of the card does not activate word transfer.
Further modifications were done to enable block DMA transfer. This could
only be used with a new DSR (1.6) and a daughterboard to replace the
PLD circuit.
Note that the DSR is not used when the card is used with the Geneve, since
the Geneve operating system brings its own SCSI driver. Block mode can
be explicitly activated with PDMA ON, but for this version of the emulation,
this will lead to a lockup, so PDMA OFF must be ensured.
A clone card was designed by the System 99 user group (SNUG), called ASCSI,
which contained all modifications.
Components
----------
ispLSI2064 PLD (Custom decoder chip) (Rev G)
62256 RAM 32Kx8
27512 EPROM 64Kx8
NEC 53C80 SCSI Controller
Dip switches
Memory map
----------
CB5=0 (CRU bit 5)
4000-4FDF: EPROM (1 of 8 banks @ 8K)
4FE0-4FFF: Controller
5000-5FFF: SRAM (if CB1=1) or EPROM (if CB1=0)
CB5=1:
4000-4FFF: SRAM (if CB1=1) or EPROM (if CB1=0)
5000-5FDF: EPROM (1 of 8 banks)
5FE0-5FFF: Controller
DIP switches [1]
SW1: CRU base 0600 - 1f00
SW2: 0: Driver LOAD/Parity enable
1: SCSI ID Bit 0 (6 or 7)
2: Normally on
3: Normally on
4: Geneve mode
CRU mapping
-----------
Read Write
0: SCSI IRQ 0: Card select
1: SCSI DRQ 1: SRAM enable (hides EPROM)
2: SCSI READY 2: SCSI DMA mode enable
3-7: DIP SW2 3: SCSI EOP (End of process)
4: Word transfer mode select
5: Bank swap
6: -
7: -
8-10: EPROM bank (10=MSB)
11: -
12-14: SRAM bank (14=MSB)
15: -
I/O ports (4Fxx for CB5=0, 5Fxx for CB5=1)
---------
Read Write
4FE0 Current SCSI data 4FF0 Output data (PIO and DMA)
4FE2 Initiator command 4FF2 Initiator command
4FE4 Mode 4FF4 Mode
4FE6 Target command 4FF6 Target command
4FE8 Current SCSI bus status 4FF8 Select enable
4FEA Bus and status 4FFA Start DMA send
4FEC Input data (DMA) 4FFC Start DMA target receive
4FEE Reset parity/interrupt 4FFE Start DMA initiator receive
Drive mappings:
SCS1 = SCSI ID 0
SCS2 = SCSI ID 1
...
SCS8 = SCSI ID 7
Michael Zapf
References
[1] Western Horizon Technologies: SCSI Host Adapter Card / Hardware
Installation Manual
Acknowledgements
Thanks to Don O'Neil of WHT for providing the required schematics, ROM dumps,
and documentation
*****************************************************************************/
#include "emu.h"
#include "scsicard.h"
#include "bus/nscsi/devices.h"
#define LOG_WARN (1U<<1)
#define LOG_CRU (1U<<2)
#define LOG_EPROM (1U<<3)
#define LOG_RAM (1U<<4)
#define LOG_CONTR (1U<<5)
#define LOG_CB (1U<<6)
#define LOG_READY (1U<<7)
#define LOG_DMA (1U<<8)
#define VERBOSE ( LOG_GENERAL | LOG_WARN )
#include "logmacro.h"
#define BUFFER "ram"
#define PLD_TAG "pld"
#define CONTR_TAG "scsibus:7:controller"
#define SCSIBUS_TAG "scsibus"
DEFINE_DEVICE_TYPE(TI99_WHTSCSI, bus::ti99::peb::whtech_scsi_card_device, "ti99_whtscsi", "Western Horizon Technologies SCSI host adapter")
DEFINE_DEVICE_TYPE(WHTSCSI_PLD, bus::ti99::peb::whtscsi_pld_device, PLD_TAG, "WHTech SCSI PLD")
namespace bus::ti99::peb {
whtech_scsi_card_device::whtech_scsi_card_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) :
device_t(mconfig, TI99_WHTSCSI, tag, owner, clock),
device_ti99_peribox_card_interface(mconfig, *this),
m_buffer_ram(*this, BUFFER),
m_pld(*this, PLD_TAG),
m_controller(*this, CONTR_TAG),
m_scsibus(*this, SCSIBUS_TAG),
m_irq(false),
m_drq(false),
m_readyset(false)
{
}
void whtech_scsi_card_device::setaddress_dbin(offs_t offset, int state)
{
// Do not allow setaddress for debugger
if (machine().side_effects_disabled()) return;
m_address = offset;
if (in_dsr_space(offset, true) && m_pld->card_selected())
{
LOGMASKED(LOG_READY, "setadd %04x (%s)\n", offset & 0xffff, machine().describe_context());
operate_ready_line();
}
}
void whtech_scsi_card_device::operate_ready_line()
{
m_pld->update_line_states(m_address, m_drq, m_irq);
// Clear or assert the outgoing READY line
bool newready = m_pld->ready();
if (newready != m_readyset)
{
LOGMASKED(LOG_READY, "READY line changed to %d\n", newready);
m_slot->set_ready(newready);
m_readyset = newready;
}
}
/*
Debugger access.
*/
void whtech_scsi_card_device::debug_read(offs_t offset, uint8_t* value)
{
offs_t addrcopy = m_address;
m_address = offset;
if (m_pld->sram_cs())
{
*value = m_buffer_ram->pointer()[(m_address & 0x0fff) | (m_pld->sram_bank()<<12)];
}
if (m_pld->eprom_cs())
{
// EPROM selected
int base = (m_pld->eprom_bank()<<13);
*value = m_eprom[base | (m_address & 0x1fff)];
}
m_address = addrcopy;
}
/*
Debugger access.
*/
void whtech_scsi_card_device::debug_write(offs_t offset, uint8_t data)
{
offs_t addrcopy = m_address;
m_address = offset;
if (m_pld->sram_cs())
{
m_buffer_ram->pointer()[(m_address & 0x0fff) | (m_pld->sram_bank()<<12)] = data;
}
m_address = addrcopy;
}
void whtech_scsi_card_device::readz(offs_t offset, uint8_t *value)
{
if (machine().side_effects_disabled())
{
debug_read(offset, value);
return;
}
if (!m_pld->card_selected()) return;
if (in_dsr_space(offset, true)) LOGMASKED(LOG_READY, "rd %04x\n", offset & 0xffff);
if (m_pld->eprom_cs())
{
// Lines A0-A12 directly connected to the EPROM (chip pin order)
// Lines A13-A15 connected to PLD
int base = (m_pld->eprom_bank()<<13);
uint8_t* rom = &m_eprom[base | (m_address & 0x1fff)];
*value = *rom;
if (WORD_ALIGNED(m_address))
{
// Do logging by 16 bit words, as we typically have instructions in
// the eprom
uint16_t val = (*rom << 8) | (*(rom+1));
LOGMASKED(LOG_EPROM, "DSR: %04x (bank %d) -> %04x\n", m_address & 0xffff, m_pld->eprom_bank(), val);
}
}
if (m_pld->sram_cs())
{
// Lines A0-A11 directly connected to the SRAM (chip pin order)
// Lines A12-A14 connected to PLD
*value = m_buffer_ram->pointer()[(m_address & 0x0fff) | (m_pld->sram_bank()<<12)];
LOGMASKED(LOG_RAM, "RAM: %04x (bank %d) -> %02x\n", m_address & 0xffff, m_pld->sram_bank(), *value);
}
if (m_pld->scsi_cs())
{
// Only for addresses 4fe0-4fef
if ((m_address & 0x0010)==0x0000)
{
int reg = (m_address >> 1)&0x07;
// If we are in DMA mode, reading from register 6 means DMA read
if ((m_controller->read(2) & 0x02) && (reg == 6))
{
LOGMASKED(LOG_DMA, "CTR: DMA in (%s)\n", machine().describe_context());
*value = m_controller->dma_r();
LOGMASKED(LOG_DMA, "CTR: DMA -> %02x\n", *value);
}
else
{
*value = m_controller->read(reg);
LOGMASKED(LOG_CONTR, "CTR: Reg %d (%04x) -> %02x (%s)\n", reg, m_address & 0xffff, *value, machine().describe_context());
}
}
}
}
void whtech_scsi_card_device::write(offs_t offset, uint8_t data)
{
if (machine().side_effects_disabled())
{
debug_write(offset, data);
return;
}
if (!m_pld->card_selected()) return;
if (in_dsr_space(offset, true)) LOGMASKED(LOG_READY, "wr %04x\n", offset & 0xffff);
if (m_pld->sram_cs())
{
// Lines A0-A11 directly connected to the SRAM (chip pin order)
// Lines A12-A14 connected to PLD
LOGMASKED(LOG_RAM, "RAM: %04x (bank %d) <- %02x\n", m_address & 0xffff, m_pld->sram_bank(), data);
m_buffer_ram->pointer()[(m_address & 0x0fff) | (m_pld->sram_bank()<<12)] = data;
}
if (m_pld->scsi_cs())
{
// Only for addresses 4ff0-4fff
if ((m_address & 0x0010)==0x0010)
{
int reg = (m_address >> 1)&0x07;
// If we are in DMA mode, writing to register 0 means DMA write
if ((m_controller->read(2) & 0x02) && (reg == 0))
{
LOGMASKED(LOG_DMA, "CTR: DMA out <- %02x (%s)\n", data, machine().describe_context());
m_controller->dma_w(data);
}
else
{
LOGMASKED(LOG_CONTR, "CTR: Reg %d (%04x) <- %02x (%s)\n", reg, m_address & 0xffff, data, machine().describe_context());
m_controller->write(reg, data);
}
}
}
}
/*
CRU read access
*/
void whtech_scsi_card_device::crureadz(offs_t offset, uint8_t *value)
{
m_pld->crureadz(offset, value);
}
/*
CRU write access. The flags are kept in the PLD.
*/
void whtech_scsi_card_device::cruwrite(offs_t offset, uint8_t data)
{
m_pld->cruwrite(offset, data);
operate_ready_line();
}
/*
Callbacks for the controller chip.
*/
WRITE_LINE_MEMBER( whtech_scsi_card_device::drq_w )
{
LOGMASKED(LOG_CB, "DRQ pin from controller = %d\n", state);
bool drq = (state==ASSERT_LINE);
if (drq != m_drq)
{
m_drq = drq;
m_slot->set_inta((m_drq || m_irq)? ASSERT_LINE : CLEAR_LINE);
}
operate_ready_line();
}
WRITE_LINE_MEMBER( whtech_scsi_card_device::irq_w )
{
LOGMASKED(LOG_CB, "IRQ pin from controller = %d\n", state);
bool irq = (state==ASSERT_LINE);
if (irq != m_irq)
{
m_irq = irq;
m_slot->set_inta((m_drq || m_irq)? ASSERT_LINE : CLEAR_LINE);
}
operate_ready_line();
}
void whtech_scsi_card_device::signal_scsi_eop(int state)
{
m_controller->eop_w(state);
}
void whtech_scsi_card_device::device_add_mconfig(machine_config &config)
{
// RAM circuit
RAM(config, BUFFER).set_default_size("32K").set_default_value(0);
// PLD circuit
WHTSCSI_PLD(config, PLD_TAG);
// SCSI bus
NSCSI_BUS(config, m_scsibus);
NSCSI_CONNECTOR(config, "scsibus:0", default_scsi_devices, nullptr, false);
NSCSI_CONNECTOR(config, "scsibus:1", default_scsi_devices, nullptr, false);
NSCSI_CONNECTOR(config, "scsibus:2", default_scsi_devices, nullptr, false);
NSCSI_CONNECTOR(config, "scsibus:3", default_scsi_devices, nullptr, false);
NSCSI_CONNECTOR(config, "scsibus:4", default_scsi_devices, nullptr, false);
NSCSI_CONNECTOR(config, "scsibus:5", default_scsi_devices, nullptr, false);
NSCSI_CONNECTOR(config, "scsibus:6", default_scsi_devices, nullptr, false);
NSCSI_CONNECTOR(config, "scsibus:7").option_set("controller", NCR53C80).machine_config([this](device_t *device) {
ncr53c80_device &adapter = downcast<ncr53c80_device &>(*device);
adapter.drq_handler().set(*this, FUNC(whtech_scsi_card_device::drq_w));
adapter.irq_handler().set(*this, FUNC(whtech_scsi_card_device::irq_w));
});
}
void whtech_scsi_card_device::device_start()
{
m_eprom = memregion(TI99_DSRROM)->base();
save_item(NAME(m_address));
save_item(NAME(m_irq));
save_item(NAME(m_drq));
save_item(NAME(m_readyset));
}
void whtech_scsi_card_device::device_reset()
{
m_cru_base = (ioport("SW1")->read()) << 8;
m_sw2 = ioport("SW2")->read();
m_drq = false;
m_irq = false;
}
int whtech_scsi_card_device::get_sw1()
{
return m_cru_base;
}
int whtech_scsi_card_device::get_sw2()
{
return m_sw2;
}
/*
The CRU address base for the card. According to [1], settings below
1000 only make sense with an installed AT keyboard and ROM upgrade.
*/
INPUT_PORTS_START( whtscsi )
PORT_START("SW1")
PORT_DIPNAME(0x1f, 0x12, "SCSI card CRU base")
PORT_DIPSETTING(0x06, "0600")
PORT_DIPSETTING(0x07, "0700")
PORT_DIPSETTING(0x08, "0800")
PORT_DIPSETTING(0x09, "0900")
PORT_DIPSETTING(0x0a, "0a00")
PORT_DIPSETTING(0x0b, "0b00")
PORT_DIPSETTING(0x0c, "0c00")
PORT_DIPSETTING(0x0d, "0d00")
PORT_DIPSETTING(0x0e, "0e00")
PORT_DIPSETTING(0x0f, "0f00")
PORT_DIPSETTING(0x10, "1000")
PORT_DIPSETTING(0x11, "1100")
PORT_DIPSETTING(0x12, "1200") // Default setting
PORT_DIPSETTING(0x13, "1300")
PORT_DIPSETTING(0x14, "1400")
PORT_DIPSETTING(0x15, "1500")
PORT_DIPSETTING(0x16, "1600")
PORT_DIPSETTING(0x17, "1700")
PORT_DIPSETTING(0x18, "1800")
PORT_DIPSETTING(0x19, "1900")
PORT_DIPSETTING(0x1a, "1a00")
PORT_DIPSETTING(0x1b, "1b00")
PORT_DIPSETTING(0x1c, "1c00")
PORT_DIPSETTING(0x1d, "1d00")
PORT_DIPSETTING(0x1e, "1e00")
PORT_DIPSETTING(0x1f, "1f00")
PORT_START("SW2")
PORT_DIPNAME(0x01, 0x00, "Driver LOAD/Parity enable")
PORT_DIPSETTING(0x00, DEF_STR(Off))
PORT_DIPSETTING(0x01, DEF_STR(On))
// Currently, the controller is fixed to ID 7, according to device_add_mconfig,
// and we cannot relocate the card on the bus
PORT_DIPNAME(0x0e, 0x0e, "SCSI card ID")
// PORT_DIPSETTING(0x0c, "6")
PORT_DIPSETTING(0x0e, "7")
PORT_DIPNAME(0x10, 0x00, "Geneve mode")
PORT_DIPSETTING(0x00, DEF_STR(Off))
PORT_DIPSETTING(0x10, DEF_STR(On))
INPUT_PORTS_END
ROM_START( whtscsi )
ROM_REGION(0x10000, TI99_DSRROM, 0)
ROM_LOAD("scsidsr150.u6", 0x0000, 0x10000, CRC(6e067c22) SHA1(f8d8861863e6a17042428e94967fd4ffc4b9d1de)) /* HFDC disk DSR ROM */
ROM_END
const tiny_rom_entry *whtech_scsi_card_device::device_rom_region() const
{
return ROM_NAME( whtscsi );
}
ioport_constructor whtech_scsi_card_device::device_input_ports() const
{
return INPUT_PORTS_NAME(whtscsi);
}
// ========================================================================
// PLD circuit on the board
// ========================================================================
whtscsi_pld_device::whtscsi_pld_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock)
: device_t(mconfig, WHTSCSI_PLD, tag, owner, clock),
m_board(nullptr),
m_selected(false),
m_sram_shadow(false),
m_dma_lock(false),
m_word_transfer(false),
m_bank_swapped(false),
m_readyout(true),
m_eprom_bank(0),
m_sram_bank(0)
{
}
void whtscsi_pld_device::device_start()
{
save_item(NAME(m_selected));
save_item(NAME(m_sram_shadow));
save_item(NAME(m_dma_lock));
save_item(NAME(m_word_transfer));
save_item(NAME(m_bank_swapped));
save_item(NAME(m_readyout));
save_item(NAME(m_eprom_bank));
save_item(NAME(m_sram_bank));
}
void whtscsi_pld_device::device_reset()
{
m_selected = false;
m_sram_shadow = false;
m_readyout = true;
m_dma_lock = false;
m_word_transfer = false;
m_bank_swapped = false;
m_eprom_bank = 0;
m_sram_bank = 0;
}
/*
SRAM is accessible at 5000-5fff for bank_swapped=false, else at 4000-4fff.
Needs to be turned on with the flag sram_shadow.
*/
line_state whtscsi_pld_device::sram_cs()
{
if (!m_sram_shadow) return CLEAR_LINE;
return (busen()
&& (((m_board->m_address & 0x1000)==0) == m_bank_swapped))? ASSERT_LINE : CLEAR_LINE;
}
/*
EPROM is selected when we are in the correct address space and neither
SRAM nor the controller are selected.
*/
line_state whtscsi_pld_device::eprom_cs()
{
return (busen()
&& (sram_cs()==CLEAR_LINE)
&& (scsi_cs()==CLEAR_LINE))? ASSERT_LINE : CLEAR_LINE;
}
/*
The controller is selected in the 4fe0-4ffe space, or in 5fe0-5ffe, depending
on the bank_swapped flag (4xxx for bank_swapped=false).
Also, for byte mode, only the even addresses are mapped. In word mode, the
controller shall be active for both even and odd address accesses. This is
only needed for DMA.
*/
line_state whtscsi_pld_device::scsi_cs()
{
return (busen()
&& ((m_board->m_address & 0x0fe0)==0x0fe0)
&& (((m_board->m_address & 0x1000)!=0) == m_bank_swapped)
&& (((m_board->m_address & 1)==0) || m_word_transfer))? ASSERT_LINE : CLEAR_LINE;
}
/*
Are we accessing the memory area 4000-5FFF, and this card has been turned on?
*/
bool whtscsi_pld_device::busen()
{
return (((m_board->m_address & 0x7e000)==0x74000) && m_selected);
}
/*
CRU read access
*/
void whtscsi_pld_device::crureadz(offs_t offset, uint8_t *value)
{
int crubase = m_board->get_sw1();
if ((offset & 0xff00)==crubase)
{
int bit = (offset >> 1) & 0x1f;
switch (bit)
{
case 0:
*value = m_board->m_irq? 1 : 0;
break;
case 1:
*value = m_board->m_drq? 1 : 0;
break;
case 2:
// READY; not available in the current 53C80 emulation
break;
case 3:
case 4:
case 5:
case 6:
case 7:
*value = ((m_board->get_sw2() & (1<<(bit-3)))!=0)? 1 : 0;
break;
default:
break;
}
// LOGMASKED(LOG_CRU, "CRU %04x -> %d\n", offset & 0xffff, *value);
}
}
/*
CRU write access
*/
void whtscsi_pld_device::cruwrite(offs_t offset, uint8_t data)
{
int crubase = m_board->get_sw1();
if ((offset & 0xff00)==crubase)
{
LOGMASKED(LOG_CRU, "CRU %04x <- %d (%s)\n", offset & 0xffff, data, machine().describe_context());
int bit = (offset >> 1) & 0x1f;
switch (bit)
{
case 0: // card activation
LOGMASKED(LOG_CRU, "DSR %s\n", (data!=0)? "on" : "off");
m_selected = (data != 0);
break;
case 1: // SRAM shadow
LOGMASKED(LOG_CRU, "SRAM shadow %s\n", (data!=0)? "on" : "off");
m_sram_shadow = (data != 0);
break;
case 2: // DMA lock enable
LOGMASKED(LOG_CRU, "DMA lock %s\n", (data!=0)? "on" : "off");
m_dma_lock = (data != 0);
break;
case 3: // SCSI EOP
LOGMASKED(LOG_CRU, "SCSI EOP %s\n", (data!=0)? "on" : "off");
m_board->signal_scsi_eop((data != 0)? ASSERT_LINE : CLEAR_LINE);
break;
case 4:
LOGMASKED(LOG_CRU, "Word transfer %s\n", (data!=0)? "on" : "off");
m_word_transfer = (data != 0);
break;
case 5:
LOGMASKED(LOG_CRU, "Bank swap %s\n", (data!=0)? "on" : "off");
m_bank_swapped = (data != 0);
break;
case 6:
LOGMASKED(LOG_CRU, "Block mode %s (not implemented)\n", (data!=0)? "on" : "off");
break;
case 8:
case 9:
case 10:
if (data != 0)
m_eprom_bank = m_eprom_bank | (1<<(bit-8));
else
m_eprom_bank = m_eprom_bank & ~(1<<(bit-8));
break;
case 12:
case 13:
case 14:
if (data != 0)
m_sram_bank = m_sram_bank | (1<<(bit-12));
else
m_sram_bank = m_sram_bank & ~(1<<(bit-12));
break;
default:
break;
}
}
}
bool whtscsi_pld_device::ready()
{
return m_readyout;
}
bool whtscsi_pld_device::card_selected()
{
return m_selected;
}
/*
Updates the state of the READY output of the PLD. In the real device, the
SCSIDACK line is also updated, but this line is not used with the current
implementation of the 53C80.
READY is always asserted when an IRQ is pending or when we do not use DMA
Otherwise, READY is asserted when a DRQ is pending
When the DMA lock is active, and there is no DRQ yet, let the CPU wait
*/
void whtscsi_pld_device::update_line_states(int address, bool drq, bool irq)
{
m_readyout = (irq || !m_dma_lock)? true : drq;
}
void whtscsi_pld_device::device_config_complete()
{
m_board = static_cast<whtech_scsi_card_device*>(owner());
}
} // end namespace bus::ti99::peb
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