mame/src/devices/bus/coco/coco_multi.cpp
David Ladd b5bad2e527 Coco2drivewire (#3260)
* Added COCO2_DW1 to cart devices for the Color Computer 2/2B that has the CoCo 1/2 series of systems.
Added unofficial systems CoCo2DW1 and CoCo2BDW1 for use with the CoCo 2 series of DriveWire Becker Port.

* Added coco2dw1 and coco2bdw1 to mame.lst file.

* Removed coco2dw1 and coco2bdw1 as requested.

COCO2_HDB1 is cart slot device and is still intact.

* Removed the coco2dw1 and coco2bdw1 from the mame.lst file.

* Had to add cc2hdb1/COCO2_HDB1 to coco_multi.cpp so the COCO2_HDB1 cart would be usable in the multipak device.
2018-02-28 14:03:37 -05:00

490 lines
16 KiB
C++

// license:BSD-3-Clause
// copyright-holders:Nathan Woods
/***************************************************************************
coco_multi.cpp
Code for emulating CoCo's Multi-Pak Interface
The Multi-Pak interface multiplexes all I/O lines from the Color
Computer's expansion port to four identical ports. All I/O lines
are continuously multiplexed except:
Pin 36 - *SCS
Pin 32 - *CTS
Pin 8 - *CART
These I/O lines are switched in one of two ways. First, is the front
panel, four position switch. When adjusted the switch will direct the
MPI to target these three I/O lines to the selected slot.
Second, the MPI will listen to writes to $FF7F and respond accordingly:
bit 0 --\___ Target *SCS to this slot number
bit 1 --/
bit 2 ------ Ignore
bit 3 ------ Ignore
bit 4 --\___ Target *CTS and *CART to this slot number
bit 5 --/
bit 6 ------ Ignore
bit 7 ------ Ignore
After writing to $FF7F, the position of the physical switch has no
effect until reset.
Reading is supported on $FF7F. It will reflect the position of the
physical switch. Until data is written to $FF7F, then it will only
reflect what has been written until a reset.
A common modification users of the OS-9 operating system made was to
tie all of the *CART pins together on the MPI motherboard. The *CART
line is connected to the 6809's IRQ line. This allowed any hardware
device in any slot to signal an IRQ to the CPU, no matter what the
switch position was. OS-9 was designed from the very start to poll
each device attached on every IRQ signal.
Because of sloppy address decoding the original MPI also responds to
$FF9F. No software is known to take advantage of this. After the
introduction of the CoCo 3, which uses $FF9F internally, Tandy provided
free upgrades to any MPI to fix this problem. This behavior is not
emulated (yet).
Slots seem to be one-counted (i.e. - 1-4, not 0-3) by convention
***************************************************************************/
#include "emu.h"
#include "coco_multi.h"
#include "cococart.h"
#include "coco_dcmodem.h"
#include "coco_fdc.h"
#include "coco_gmc.h"
#include "coco_orch90.h"
#include "coco_pak.h"
#include "coco_rs232.h"
#include "coco_ssc.h"
#define SLOT1_TAG "slot1"
#define SLOT2_TAG "slot2"
#define SLOT3_TAG "slot3"
#define SLOT4_TAG "slot4"
#define SWITCH_CONFIG_TAG "switch"
//**************************************************************************
// MACROS / CONSTANTS
//**************************************************************************
static constexpr uint8_t MULTI_SLOT_LOOKUP[] = {0xcc, 0xdd, 0xee, 0xff};
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> coco_multipak_device
namespace
{
class coco_multipak_device
: public device_t
, public device_cococart_interface
, public device_cococart_host_interface
{
public:
// construction/destruction
coco_multipak_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
// optional information overrides
virtual void device_add_mconfig(machine_config &config) override;
virtual uint8_t* get_cart_base() override;
// these are only public so they can be in a MACHINE_CONFIG_START
// declaration; don't think about them as publically accessable
DECLARE_WRITE_LINE_MEMBER(multi_slot1_cart_w);
DECLARE_WRITE_LINE_MEMBER(multi_slot1_nmi_w);
DECLARE_WRITE_LINE_MEMBER(multi_slot1_halt_w);
DECLARE_WRITE_LINE_MEMBER(multi_slot2_cart_w);
DECLARE_WRITE_LINE_MEMBER(multi_slot2_nmi_w);
DECLARE_WRITE_LINE_MEMBER(multi_slot2_halt_w);
DECLARE_WRITE_LINE_MEMBER(multi_slot3_cart_w);
DECLARE_WRITE_LINE_MEMBER(multi_slot3_nmi_w);
DECLARE_WRITE_LINE_MEMBER(multi_slot3_halt_w);
DECLARE_WRITE_LINE_MEMBER(multi_slot4_cart_w);
DECLARE_WRITE_LINE_MEMBER(multi_slot4_nmi_w);
DECLARE_WRITE_LINE_MEMBER(multi_slot4_halt_w);
virtual address_space &cartridge_space() override;
virtual ioport_constructor device_input_ports() const override;
INPUT_CHANGED_MEMBER( switch_changed );
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
virtual READ8_MEMBER(scs_read) override;
virtual WRITE8_MEMBER(scs_write) override;
virtual void set_sound_enable(bool sound_enable) override;
private:
// device references
required_device_array<cococart_slot_device, 4> m_slots;
// internal state
uint8_t m_select;
uint8_t m_block;
// internal accessors
int active_scs_slot_number() const;
int active_cts_slot_number() const;
cococart_slot_device &slot(int slot_number);
cococart_slot_device &active_scs_slot();
cococart_slot_device &active_cts_slot();
// methods
void set_select(uint8_t new_select);
DECLARE_READ8_MEMBER(ff7f_read);
DECLARE_WRITE8_MEMBER(ff7f_write);
void update_line(int slot_number, line ln);
};
};
/***************************************************************************
IMPLEMENTATION
***************************************************************************/
static SLOT_INTERFACE_START(coco_cart_slot1_3)
SLOT_INTERFACE("rs232", COCO_RS232)
SLOT_INTERFACE("dcmodem", COCO_DCMODEM)
SLOT_INTERFACE("orch90", COCO_ORCH90)
SLOT_INTERFACE("ssc", COCO_SSC) MCFG_SLOT_OPTION_CLOCK("ssc", DERIVED_CLOCK(1, 1))
SLOT_INTERFACE("games_master", COCO_PAK_GMC)
SLOT_INTERFACE("banked_16k", COCO_PAK_BANKED)
SLOT_INTERFACE("pak", COCO_PAK)
SLOT_INTERFACE_END
static SLOT_INTERFACE_START(coco_cart_slot4)
SLOT_INTERFACE("cc2hdb1", COCO2_HDB1)
SLOT_INTERFACE("cc3hdb1", COCO3_HDB1)
SLOT_INTERFACE("fdcv11", COCO_FDC_V11)
SLOT_INTERFACE("rs232", COCO_RS232)
SLOT_INTERFACE("dcmodem", COCO_DCMODEM)
SLOT_INTERFACE("orch90", COCO_ORCH90)
SLOT_INTERFACE("ssc", COCO_SSC) MCFG_SLOT_OPTION_CLOCK("ssc", DERIVED_CLOCK(1, 1))
SLOT_INTERFACE("games_master", COCO_PAK_GMC)
SLOT_INTERFACE("banked_16k", COCO_PAK_BANKED)
SLOT_INTERFACE("pak", COCO_PAK)
SLOT_INTERFACE_END
MACHINE_CONFIG_START(coco_multipak_device::device_add_mconfig)
MCFG_COCO_CARTRIDGE_ADD(SLOT1_TAG, coco_cart_slot1_3, nullptr)
MCFG_COCO_CARTRIDGE_CART_CB(DEVWRITELINE(DEVICE_SELF, coco_multipak_device, multi_slot1_cart_w))
MCFG_COCO_CARTRIDGE_NMI_CB(DEVWRITELINE(DEVICE_SELF, coco_multipak_device, multi_slot1_nmi_w))
MCFG_COCO_CARTRIDGE_HALT_CB(DEVWRITELINE(DEVICE_SELF, coco_multipak_device, multi_slot1_halt_w))
MCFG_COCO_CARTRIDGE_ADD(SLOT2_TAG, coco_cart_slot1_3, nullptr)
MCFG_COCO_CARTRIDGE_CART_CB(DEVWRITELINE(DEVICE_SELF, coco_multipak_device, multi_slot2_cart_w))
MCFG_COCO_CARTRIDGE_NMI_CB(DEVWRITELINE(DEVICE_SELF, coco_multipak_device, multi_slot2_nmi_w))
MCFG_COCO_CARTRIDGE_HALT_CB(DEVWRITELINE(DEVICE_SELF, coco_multipak_device, multi_slot2_halt_w))
MCFG_COCO_CARTRIDGE_ADD(SLOT3_TAG, coco_cart_slot1_3, nullptr)
MCFG_COCO_CARTRIDGE_CART_CB(DEVWRITELINE(DEVICE_SELF, coco_multipak_device, multi_slot3_cart_w))
MCFG_COCO_CARTRIDGE_NMI_CB(DEVWRITELINE(DEVICE_SELF, coco_multipak_device, multi_slot3_nmi_w))
MCFG_COCO_CARTRIDGE_HALT_CB(DEVWRITELINE(DEVICE_SELF, coco_multipak_device, multi_slot3_halt_w))
MCFG_COCO_CARTRIDGE_ADD(SLOT4_TAG, coco_cart_slot4, "fdcv11")
MCFG_COCO_CARTRIDGE_CART_CB(DEVWRITELINE(DEVICE_SELF, coco_multipak_device, multi_slot4_cart_w))
MCFG_COCO_CARTRIDGE_NMI_CB(DEVWRITELINE(DEVICE_SELF, coco_multipak_device, multi_slot4_nmi_w))
MCFG_COCO_CARTRIDGE_HALT_CB(DEVWRITELINE(DEVICE_SELF, coco_multipak_device, multi_slot4_halt_w))
MACHINE_CONFIG_END
INPUT_PORTS_START( coco_multipack )
PORT_START( SWITCH_CONFIG_TAG )
PORT_CONFNAME( 0x03, 0x03, "Multi-Pak Slot Switch" ) PORT_CHANGED_MEMBER(DEVICE_SELF, coco_multipak_device, switch_changed, nullptr)
PORT_CONFSETTING( 0x00, "Slot 1" )
PORT_CONFSETTING( 0x01, "Slot 2" )
PORT_CONFSETTING( 0x02, "Slot 3" )
PORT_CONFSETTING( 0x03, "Slot 4" )
INPUT_PORTS_END
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
DEFINE_DEVICE_TYPE(COCO_MULTIPAK, coco_multipak_device, "coco_multipack", "CoCo Multi-Pak Interface")
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// input_ports - device-specific input ports
//-------------------------------------------------
ioport_constructor coco_multipak_device::device_input_ports() const
{
return INPUT_PORTS_NAME( coco_multipack );
}
//-------------------------------------------------
// coco_multipak_device - constructor
//-------------------------------------------------
coco_multipak_device::coco_multipak_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, COCO_MULTIPAK, tag, owner, clock)
, device_cococart_interface(mconfig, *this)
, m_slots(*this, "slot%u", 1), m_select(0), m_block(0)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void coco_multipak_device::device_start()
{
// install $FF7F handler
install_readwrite_handler(0xFF7F, 0xFF7F, read8_delegate(FUNC(coco_multipak_device::ff7f_read), this),write8_delegate(FUNC(coco_multipak_device::ff7f_write), this));
// initial state
m_select = 0xFF;
m_block = 0;
// save state
save_item(NAME(m_select));
save_item(NAME(m_block));
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void coco_multipak_device::device_reset()
{
set_select(MULTI_SLOT_LOOKUP[ioport(SWITCH_CONFIG_TAG)->read()]);
m_block = 0;
}
//-------------------------------------------------
// switch_changed - panel switch changed
//-------------------------------------------------
INPUT_CHANGED_MEMBER( coco_multipak_device::switch_changed )
{
if (m_block == 0)
set_select(MULTI_SLOT_LOOKUP[newval]);
}
//**************************************************************************
// INTERNAL ACCESSORS
//**************************************************************************
//-------------------------------------------------
// active_scs_slot_number
//-------------------------------------------------
int coco_multipak_device::active_scs_slot_number() const
{
return ((m_select >> 0) & 0x03) + 1;
}
//-------------------------------------------------
// active_cts_slot_number
//-------------------------------------------------
int coco_multipak_device::active_cts_slot_number() const
{
return ((m_select >> 4) & 0x03) + 1;
}
//-------------------------------------------------
// slot
//-------------------------------------------------
cococart_slot_device &coco_multipak_device::slot(int slot_number)
{
assert(slot_number >= 1 && slot_number <= 4);
return *m_slots[slot_number - 1];
}
//-------------------------------------------------
// active_scs_slot
//-------------------------------------------------
cococart_slot_device &coco_multipak_device::active_scs_slot()
{
int slot_number = active_scs_slot_number();
return slot(slot_number);
}
//-------------------------------------------------
// active_cts_slot
//-------------------------------------------------
cococart_slot_device &coco_multipak_device::active_cts_slot()
{
int slot_number = active_cts_slot_number();
return slot(slot_number);
}
//**************************************************************************
// METHODS
//**************************************************************************
//-------------------------------------------------
// set_select
//-------------------------------------------------
void coco_multipak_device::set_select(uint8_t new_select)
{
// identify old value for CART, in case this needs to change
cococart_slot_device::line_value old_cart = active_cts_slot().get_line_value(line::CART);
// change value
uint8_t xorval = m_select ^ new_select;
m_select = new_select;
// did the cartridge base change?
if (xorval & 0x03)
cart_base_changed();
// did the CART line change?
line_value new_cart = active_cts_slot().get_line_value(line::CART);
if (new_cart != old_cart)
update_line(active_cts_slot_number(), line::CART);
}
//-------------------------------------------------
// ff7f_read
//-------------------------------------------------
READ8_MEMBER(coco_multipak_device::ff7f_read)
{
return m_select | 0xcc;
}
//-------------------------------------------------
// ff7f_write
//-------------------------------------------------
WRITE8_MEMBER(coco_multipak_device::ff7f_write)
{
m_block = 0xff;
set_select(data);
}
//-------------------------------------------------
// update_line
//-------------------------------------------------
void coco_multipak_device::update_line(int slot_number, line ln)
{
bool propagate;
// one of our child devices set a line; we may need to propagate it upwards
switch (ln)
{
case line::CART:
// only propagate if this is coming from the slot specified
propagate = slot_number == active_cts_slot_number();
break;
case line::NMI:
case line::HALT:
// always propagate these
propagate = true;
break;
default:
// do nothing
propagate = false;
break;
}
if (propagate)
owning_slot().set_line_value(ln, slot(slot_number).get_line_value(ln));
}
//-------------------------------------------------
// set_sound_enable
//-------------------------------------------------
void coco_multipak_device::set_sound_enable(bool sound_enable)
{
// the SOUND_ENABLE (SNDEN) line is different; it is controlled by the CPU
for (cococart_slot_device *slot : m_slots)
slot->set_line_value(line::SOUND_ENABLE, sound_enable ? line_value::ASSERT : line_value::CLEAR);
}
//-------------------------------------------------
// get_cart_base
//-------------------------------------------------
uint8_t* coco_multipak_device::get_cart_base()
{
return active_cts_slot().get_cart_base();
}
//-------------------------------------------------
// scs_read
//-------------------------------------------------
READ8_MEMBER(coco_multipak_device::scs_read)
{
return active_scs_slot().scs_read(space, offset);
}
//-------------------------------------------------
// scs_write
//-------------------------------------------------
WRITE8_MEMBER(coco_multipak_device::scs_write)
{
active_scs_slot().scs_write(space, offset, data);
}
//-------------------------------------------------
// multiX_slotX_[cart|nmi|halt] trampolines
//-------------------------------------------------
WRITE_LINE_MEMBER(coco_multipak_device::multi_slot1_cart_w) { update_line(1, line::CART); }
WRITE_LINE_MEMBER(coco_multipak_device::multi_slot1_nmi_w) { update_line(1, line::NMI); }
WRITE_LINE_MEMBER(coco_multipak_device::multi_slot1_halt_w) { update_line(1, line::HALT); }
WRITE_LINE_MEMBER(coco_multipak_device::multi_slot2_cart_w) { update_line(2, line::CART); }
WRITE_LINE_MEMBER(coco_multipak_device::multi_slot2_nmi_w) { update_line(2, line::NMI); }
WRITE_LINE_MEMBER(coco_multipak_device::multi_slot2_halt_w) { update_line(2, line::HALT); }
WRITE_LINE_MEMBER(coco_multipak_device::multi_slot3_cart_w) { update_line(3, line::CART); }
WRITE_LINE_MEMBER(coco_multipak_device::multi_slot3_nmi_w) { update_line(3, line::NMI); }
WRITE_LINE_MEMBER(coco_multipak_device::multi_slot3_halt_w) { update_line(3, line::HALT); }
WRITE_LINE_MEMBER(coco_multipak_device::multi_slot4_cart_w) { update_line(4, line::CART); }
WRITE_LINE_MEMBER(coco_multipak_device::multi_slot4_nmi_w) { update_line(4, line::NMI); }
WRITE_LINE_MEMBER(coco_multipak_device::multi_slot4_halt_w) { update_line(4, line::HALT); }
//-------------------------------------------------
// cartridge_space
//-------------------------------------------------
address_space &coco_multipak_device::cartridge_space()
{
return device_cococart_interface::cartridge_space();
}