mame/src/mess/machine/adam_ddp.c
2012-11-19 08:40:08 +00:00

316 lines
7.8 KiB
C

/**********************************************************************
Coleco Adam Digital Data Pack emulation
Copyright MESS Team.
Visit http://mamedev.org for licensing and usage restrictions.
**********************************************************************/
#include "adam_ddp.h"
//**************************************************************************
// MACROS / CONSTANTS
//**************************************************************************
#define M6801_TAG "m6801"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
const device_type ADAM_DDP = &device_creator<adam_digital_data_pack_device>;
//-------------------------------------------------
// ROM( adam_ddp )
//-------------------------------------------------
ROM_START( adam_ddp )
ROM_REGION( 0x800, M6801_TAG, 0 )
ROM_LOAD( "tape rev a 8865.u24", 0x000, 0x800, CRC(6b9ea1cf) SHA1(b970f11e8f443fa130fba02ad1f60da51bf89673) )
ROM_END
//-------------------------------------------------
// rom_region - device-specific ROM region
//-------------------------------------------------
const rom_entry *adam_digital_data_pack_device::device_rom_region() const
{
return ROM_NAME( adam_ddp );
}
//-------------------------------------------------
// ADDRESS_MAP( adam_ddp_mem )
//-------------------------------------------------
static ADDRESS_MAP_START( adam_ddp_mem, AS_PROGRAM, 8, adam_digital_data_pack_device )
AM_RANGE(0x0000, 0x001f) AM_READWRITE_LEGACY(m6801_io_r, m6801_io_w)
AM_RANGE(0x0080, 0x00ff) AM_RAM
AM_RANGE(0x0400, 0x07ff) AM_RAM
AM_RANGE(0xf800, 0xffff) AM_ROM AM_REGION(M6801_TAG, 0)
ADDRESS_MAP_END
//-------------------------------------------------
// ADDRESS_MAP( adam_ddp_io )
//-------------------------------------------------
static ADDRESS_MAP_START( adam_ddp_io, AS_IO, 8, adam_digital_data_pack_device )
AM_RANGE(M6801_PORT1, M6801_PORT1) AM_WRITE(p1_w)
AM_RANGE(M6801_PORT2, M6801_PORT2) AM_READWRITE(p2_r, p2_w)
AM_RANGE(M6801_PORT3, M6801_PORT3) AM_NOP // Multiplexed Address/Data
AM_RANGE(M6801_PORT4, M6801_PORT4) AM_READ(p4_r) AM_WRITENOP
ADDRESS_MAP_END
//-------------------------------------------------
// cassette_interface adam_cassette_interface
//-------------------------------------------------
static const struct CassetteOptions adam_cassette_options =
{
2, /* channels */
16, /* bits per sample */
44100 /* sample frequency */
};
static const cassette_interface adam_cassette_interface =
{
coleco_adam_cassette_formats,
&adam_cassette_options,
(cassette_state)(CASSETTE_PLAY | CASSETTE_MOTOR_DISABLED | CASSETTE_SPEAKER_MUTED),
"adam_cass",
NULL
};
//-------------------------------------------------
// MACHINE_DRIVER( adam_ddp )
//-------------------------------------------------
static MACHINE_CONFIG_FRAGMENT( adam_ddp )
MCFG_CPU_ADD(M6801_TAG, M6801, XTAL_4MHz)
MCFG_CPU_PROGRAM_MAP(adam_ddp_mem)
MCFG_CPU_IO_MAP(adam_ddp_io)
MCFG_CASSETTE_ADD(CASSETTE_TAG, adam_cassette_interface)
MCFG_CASSETTE_ADD(CASSETTE2_TAG, adam_cassette_interface)
MACHINE_CONFIG_END
//-------------------------------------------------
// machine_config_additions - device-specific
// machine configurations
//-------------------------------------------------
machine_config_constructor adam_digital_data_pack_device::device_mconfig_additions() const
{
return MACHINE_CONFIG_NAME( adam_ddp );
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// adam_digital_data_pack_device - constructor
//-------------------------------------------------
adam_digital_data_pack_device::adam_digital_data_pack_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: device_t(mconfig, ADAM_DDP, "Adam DDP", tag, owner, clock),
device_adamnet_card_interface(mconfig, *this),
m_maincpu(*this, M6801_TAG),
m_ddp0(*this, CASSETTE_TAG),
m_ddp1(*this, CASSETTE2_TAG)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void adam_digital_data_pack_device::device_start()
{
// state saving
save_item(NAME(m_wr0));
save_item(NAME(m_wr1));
save_item(NAME(m_track));
}
//-------------------------------------------------
// adamnet_reset_w -
//-------------------------------------------------
void adam_digital_data_pack_device::adamnet_reset_w(int state)
{
m_maincpu->set_input_line(INPUT_LINE_RESET, state);
}
//-------------------------------------------------
// p1_w -
//-------------------------------------------------
WRITE8_MEMBER( adam_digital_data_pack_device::p1_w )
{
/*
bit description
0 SPD SEL (0=20 ips, 1=80ips)
1 STOP0
2 STOP1
3 _GO FWD
4 _GO REV
5 BRAKE
6 _WR0
7 _WR1
*/
if (m_ddp0->exists())
{
m_ddp0->set_speed(BIT(data, 0) ? (double) 80/1.875 : 20/1.875); // speed select
if(!(data & 0x08)) m_ddp0->go_forward();
if(!(data & 0x10)) m_ddp0->go_reverse();
m_ddp0->change_state(BIT(data, 1) ? CASSETTE_MOTOR_DISABLED : CASSETTE_MOTOR_ENABLED, CASSETTE_MASK_MOTOR); // motor control
}
if (m_ddp1->exists())
{
m_ddp1->set_speed(BIT(data, 0) ? (double) 80/1.875 : 20/1.875); // speed select
if(!(data & 0x08)) m_ddp1->go_forward();
if(!(data & 0x10)) m_ddp1->go_reverse();
m_ddp1->change_state(BIT(data, 2) ? CASSETTE_MOTOR_DISABLED : CASSETTE_MOTOR_ENABLED, CASSETTE_MASK_MOTOR); // motor control
}
// data write 0
m_wr0 = BIT(data, 6);
// data write 1
m_wr1 = BIT(data, 7);
}
//-------------------------------------------------
// p2_r -
//-------------------------------------------------
READ8_MEMBER( adam_digital_data_pack_device::p2_r )
{
/*
bit description
0 mode bit 0
1 mode bit 1 / CIP1
2 mode bit 2
3 NET RXD
4
*/
UINT8 data = 0;
if (m_bus->reset_r())
data |= M6801_MODE_6;
else
data |= m_ddp1->exists() << 1; // Cassette in place 1
// NET RXD
data |= m_bus->rxd_r(this) << 3;
return data;
}
//-------------------------------------------------
// p2_w -
//-------------------------------------------------
WRITE8_MEMBER( adam_digital_data_pack_device::p2_w )
{
/*
bit description
0 WRT DATA
1
2 TRACK A/B (0=B, 1=A)
3
4 NET TXD
*/
if (m_ddp0->exists())
{
m_ddp0->set_channel(!BIT(data, 2)); // Track select
if (!m_wr0) m_ddp0->output(BIT(data, 0) ? 1.0 : -1.0); // write data
}
if (m_ddp1->exists())
{
m_ddp1->set_channel(!BIT(data, 2));
if (!m_wr1) m_ddp1->output(BIT(data, 0) ? 1.0 : -1.0);
}
// NET TXD
m_bus->txd_w(this, BIT(data, 4));
}
//-------------------------------------------------
// p4_r -
//-------------------------------------------------
READ8_MEMBER( adam_digital_data_pack_device::p4_r )
{
/*
bit description
0 A8
1 A9
2 A10 (2114 _S)
3 MSENSE 0
4 MSENSE 1
5 CIP0
6 RD DATA 0 (always 1)
7 RD DATA 1 (data from drives ORed together)
*/
UINT8 data = 0;
// drive 0
if (m_ddp0->exists())
{
data |= ((m_ddp0->get_state() & CASSETTE_MASK_UISTATE) != CASSETTE_STOPPED) << 3; // motion sense
data |= 1 << 5; // cassette in place
data |= (m_ddp0->input() < 0) << 7; // read data
}
// drive 1
if (m_ddp1->exists())
{
data |= ((m_ddp1->get_state() & CASSETTE_MASK_UISTATE) != CASSETTE_STOPPED) << 4; // motion sense
data |= (m_ddp1->input() < 0) << 7; // read data
}
// read data 0 (always 1)
data |= 0x40;
return data;
}