mame/src/mess/machine/c8280.c
2012-08-21 10:41:19 +00:00

452 lines
10 KiB
C

/**********************************************************************
Commodore 8280 Dual 8" Disk Drive emulation
Copyright MESS Team.
Visit http://mamedev.org for licensing and usage restrictions.
**********************************************************************/
#include "c8280.h"
//**************************************************************************
// MACROS / CONSTANTS
//**************************************************************************
#define M6502_DOS_TAG "5c"
#define M6502_FDC_TAG "9e"
#define M6532_0_TAG "9f"
#define M6532_1_TAG "9g"
enum
{
LED_POWER = 0,
LED_ACT0,
LED_ACT1,
LED_ERR
};
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
const device_type C8280 = &device_creator<c8280_device>;
//-------------------------------------------------
// device_config_complete - perform any
// operations now that the configuration is
// complete
//-------------------------------------------------
void c8280_device::device_config_complete()
{
m_shortname = "c8280";
}
//-------------------------------------------------
// ROM( c8280 )
//-------------------------------------------------
ROM_START( c8280 )
ROM_REGION( 0x4000, M6502_DOS_TAG, 0 )
ROM_LOAD( "300542-001.10c", 0x0000, 0x2000, CRC(3c6eee1e) SHA1(0726f6ab4de4fc9c18707fe87780ffd9f5ed72ab) )
ROM_LOAD( "300543-001.10d", 0x2000, 0x2000, CRC(f58e665e) SHA1(9e58b47c686c91efc6ef1a27f72dbb5e26c485ec) )
ROM_REGION( 0x800, M6502_FDC_TAG, 0 )
ROM_LOAD( "300541-001.3c", 0x000, 0x800, CRC(cb07b2db) SHA1(a1f9c5a7bd3798f5a97dc0b465c3bf5e3513e148) )
ROM_END
//-------------------------------------------------
// rom_region - device-specific ROM region
//-------------------------------------------------
const rom_entry *c8280_device::device_rom_region() const
{
return ROM_NAME( c8280 );
}
//-------------------------------------------------
// ADDRESS_MAP( c8280_main_mem )
//-------------------------------------------------
static ADDRESS_MAP_START( c8280_main_mem, AS_PROGRAM, 8, c8280_device )
AM_RANGE(0x0000, 0x007f) AM_MIRROR(0x0100) AM_RAM // 6532 #1
AM_RANGE(0x0080, 0x00ff) AM_MIRROR(0x0100) AM_RAM // 6532 #2
AM_RANGE(0x0200, 0x021f) AM_MIRROR(0x0d60) AM_DEVREADWRITE_LEGACY(M6532_0_TAG, riot6532_r, riot6532_w)
AM_RANGE(0x0280, 0x029f) AM_MIRROR(0x0d60) AM_DEVREADWRITE_LEGACY(M6532_1_TAG, riot6532_r, riot6532_w)
AM_RANGE(0x1000, 0x13ff) AM_MIRROR(0x0c00) AM_RAM AM_SHARE("share1")
AM_RANGE(0x2000, 0x23ff) AM_MIRROR(0x0c00) AM_RAM AM_SHARE("share2")
AM_RANGE(0x3000, 0x33ff) AM_MIRROR(0x0c00) AM_RAM AM_SHARE("share3")
AM_RANGE(0x4000, 0x43ff) AM_MIRROR(0x0c00) AM_RAM AM_SHARE("share4")
AM_RANGE(0xc000, 0xffff) AM_ROM AM_REGION(M6502_DOS_TAG, 0)
ADDRESS_MAP_END
//-------------------------------------------------
// ADDRESS_MAP( c8280_fdc_mem )
//-------------------------------------------------
static ADDRESS_MAP_START( c8280_fdc_mem, AS_PROGRAM, 8, c8280_device )
ADDRESS_MAP_GLOBAL_MASK(0x1fff)
AM_RANGE(0x0000, 0x007f) AM_MIRROR(0x380) AM_RAM
AM_RANGE(0x0400, 0x07ff) AM_RAM AM_SHARE("share1")
AM_RANGE(0x0800, 0x0bff) AM_RAM AM_SHARE("share2")
AM_RANGE(0x0c00, 0x0fff) AM_RAM AM_SHARE("share3")
AM_RANGE(0x1000, 0x13ff) AM_RAM AM_SHARE("share4")
AM_RANGE(0x1800, 0x1fff) AM_ROM AM_REGION(M6502_FDC_TAG, 0)
ADDRESS_MAP_END
//-------------------------------------------------
// riot6532_interface riot0_intf
//-------------------------------------------------
READ8_MEMBER( c8280_device::dio_r )
{
/*
bit description
PA0 DI0
PA1 DI1
PA2 DI2
PA3 DI3
PA4 DI4
PA5 DI5
PA6 DI6
PA7 DI7
*/
return m_bus->dio_r();
}
WRITE8_MEMBER( c8280_device::dio_w )
{
/*
bit description
PB0 DO0
PB1 DO1
PB2 DO2
PB3 DO3
PB4 DO4
PB5 DO5
PB6 DO6
PB7 DO7
*/
m_bus->dio_w(this, data);
}
static const riot6532_interface riot0_intf =
{
DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, c8280_device, dio_r),
DEVCB_NULL,
DEVCB_NULL,
DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, c8280_device, dio_w),
DEVCB_NULL
};
//-------------------------------------------------
// riot6532_interface riot1_intf
//-------------------------------------------------
READ8_MEMBER( c8280_device::riot1_pa_r )
{
/*
bit description
PA0
PA1
PA2
PA3
PA4
PA5 EOII
PA6 DAVI
PA7 _ATN
*/
UINT8 data = 0;
// end or identify in
data |= m_bus->eoi_r() << 5;
// data valid in
data |= m_bus->dav_r() << 6;
// attention
data |= !m_bus->atn_r() << 7;
return data;
}
WRITE8_MEMBER( c8280_device::riot1_pa_w )
{
/*
bit description
PA0 ATNA
PA1 DACO
PA2 RFDO
PA3 EOIO
PA4 DAVO
PA5
PA6
PA7
*/
// attention acknowledge
m_atna = BIT(data, 0);
// data accepted out
m_daco = BIT(data, 1);
// not ready for data out
m_rfdo = BIT(data, 2);
// end or identify out
m_bus->eoi_w(this, BIT(data, 3));
// data valid out
m_bus->dav_w(this, BIT(data, 4));
update_ieee_signals();
}
READ8_MEMBER( c8280_device::riot1_pb_r )
{
/*
bit description
PB0 DEVICE NUMBER SELECTION
PB1 DEVICE NUMBER SELECTION
PB2 DEVICE NUMBER SELECTION
PB3
PB4
PB5
PB6 DACI
PB7 RFDI
*/
UINT8 data = 0;
// device number selection
data |= m_address - 8;
// data accepted in
data |= m_bus->ndac_r() << 6;
// ready for data in
data |= m_bus->nrfd_r() << 7;
return data;
}
WRITE8_MEMBER( c8280_device::riot1_pb_w )
{
/*
bit description
PB0
PB1
PB2
PB3 ACT LED 1
PB4 ACT LED 0
PB5 ERR LED
PB6
PB7
*/
// activity led 1
output_set_led_value(LED_ACT1, BIT(data, 3));
// activity led 0
output_set_led_value(LED_ACT0, BIT(data, 4));
// error led
output_set_led_value(LED_ERR, BIT(data, 5));
}
static const riot6532_interface riot1_intf =
{
DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, c8280_device, riot1_pa_r),
DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, c8280_device, riot1_pb_r),
DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, c8280_device, riot1_pa_w),
DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, c8280_device, riot1_pb_w),
DEVCB_CPU_INPUT_LINE(M6502_DOS_TAG, INPUT_LINE_IRQ0)
};
//-------------------------------------------------
// LEGACY_FLOPPY_OPTIONS( c8280 )
//-------------------------------------------------
static LEGACY_FLOPPY_OPTIONS_START( c8280 )
LEGACY_FLOPPY_OPTIONS_END
//-------------------------------------------------
// floppy_interface c8280_floppy_interface
//-------------------------------------------------
static const floppy_interface c8280_floppy_interface =
{
DEVCB_NULL,
DEVCB_NULL,
DEVCB_NULL,
DEVCB_NULL,
DEVCB_NULL,
FLOPPY_STANDARD_8_DSDD,
LEGACY_FLOPPY_OPTIONS_NAME(c8280),
"floppy_8",
NULL
};
//-------------------------------------------------
// MACHINE_CONFIG_FRAGMENT( c8280 )
//-------------------------------------------------
static MACHINE_CONFIG_FRAGMENT( c8280 )
MCFG_CPU_ADD(M6502_DOS_TAG, M6502, 1000000)
MCFG_CPU_PROGRAM_MAP(c8280_main_mem)
MCFG_RIOT6532_ADD(M6532_0_TAG, 1000000, riot0_intf)
MCFG_RIOT6532_ADD(M6532_1_TAG, 1000000, riot1_intf)
MCFG_CPU_ADD(M6502_FDC_TAG, M6502, 1000000)
MCFG_CPU_PROGRAM_MAP(c8280_fdc_mem)
MCFG_LEGACY_FLOPPY_2_DRIVES_ADD(c8280_floppy_interface)
MACHINE_CONFIG_END
//-------------------------------------------------
// machine_config_additions - device-specific
// machine configurations
//-------------------------------------------------
machine_config_constructor c8280_device::device_mconfig_additions() const
{
return MACHINE_CONFIG_NAME( c8280 );
}
//**************************************************************************
// INLINE HELPERS
//**************************************************************************
//-------------------------------------------------
// update_ieee_signals -
//-------------------------------------------------
inline void c8280_device::update_ieee_signals()
{
int atn = m_bus->atn_r();
int nrfd = !(!(!(atn && m_atna) && m_rfdo) || !(atn || m_atna));
int ndac = !(m_daco || !(atn || m_atna));
m_bus->nrfd_w(this, nrfd);
m_bus->ndac_w(this, ndac);
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// c8280_device - constructor
//-------------------------------------------------
c8280_device::c8280_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: device_t(mconfig, C8280, "C8280", tag, owner, clock),
device_ieee488_interface(mconfig, *this),
m_maincpu(*this, M6502_DOS_TAG),
m_fdccpu(*this, M6502_FDC_TAG),
m_riot0(*this, M6532_0_TAG),
m_riot1(*this, M6532_1_TAG),
m_image0(*this, FLOPPY_0),
m_image1(*this, FLOPPY_1),
m_rfdo(1),
m_daco(1),
m_atna(1)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void c8280_device::device_start()
{
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void c8280_device::device_reset()
{
}
//-------------------------------------------------
// device_timer - handler timer events
//-------------------------------------------------
void c8280_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
}
//-------------------------------------------------
// ieee488_atn -
//-------------------------------------------------
void c8280_device::ieee488_atn(int state)
{
update_ieee_signals();
// set RIOT PA7
riot6532_porta_in_set(m_riot1, !state << 7, 0x80);
}
//-------------------------------------------------
// ieee488_ifc -
//-------------------------------------------------
void c8280_device::ieee488_ifc(int state)
{
if (!state)
{
device_reset();
}
}