mirror of
https://github.com/holub/mame
synced 2025-05-28 16:43:04 +03:00
474 lines
11 KiB
C
474 lines
11 KiB
C
/**********************************************************************
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Commodore 1581/1563 Single Disk Drive emulation
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Copyright MESS Team.
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Visit http://mamedev.org for licensing and usage restrictions.
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**********************************************************************/
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/*
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TODO:
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- drive not ready if ready_r() is connected to CIA
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- format fails (seeks to directory track and reports BAD DISK error)
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- save fails (no error message, but no file added to directory either)
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*/
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#include "c1581.h"
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//**************************************************************************
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// MACROS / CONSTANTS
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//**************************************************************************
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#define M6502_TAG "u1"
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#define M8520_TAG "u5"
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#define WD1772_TAG "u4"
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enum
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{
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LED_POWER = 0,
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LED_ACT
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};
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//**************************************************************************
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// DEVICE DEFINITIONS
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//**************************************************************************
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const device_type C1563 = &device_creator<c1563_device>;
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const device_type C1581 = &device_creator<c1581_device>;
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//-------------------------------------------------
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// device_config_complete - perform any
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// operations now that the configuration is
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// complete
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//-------------------------------------------------
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void c1581_device::device_config_complete()
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{
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switch (m_variant)
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{
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default:
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case TYPE_1581:
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m_shortname = "c1581";
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break;
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case TYPE_1563:
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m_shortname = "c1563";
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break;
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}
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}
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//-------------------------------------------------
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// ROM( c1581 )
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//-------------------------------------------------
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ROM_START( c1581 )
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ROM_REGION( 0x8000, M6502_TAG, 0 )
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ROM_DEFAULT_BIOS("r1")
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ROM_SYSTEM_BIOS( 0, "beta", "Beta" )
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ROMX_LOAD( "beta.u2", 0x0000, 0x8000, CRC(ecc223cd) SHA1(a331d0d46ead1f0275b4ca594f87c6694d9d9594), ROM_BIOS(1) )
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ROM_SYSTEM_BIOS( 1, "r1", "Revision 1" )
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ROMX_LOAD( "318045-01.u2", 0x0000, 0x8000, CRC(113af078) SHA1(3fc088349ab83e8f5948b7670c866a3c954e6164), ROM_BIOS(2) )
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ROM_SYSTEM_BIOS( 2, "r2", "Revision 2" )
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ROMX_LOAD( "318045-02.u2", 0x0000, 0x8000, CRC(a9011b84) SHA1(01228eae6f066bd9b7b2b6a7fa3f667e41dad393), ROM_BIOS(3) )
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ROM_SYSTEM_BIOS( 3, "jiffydos", "JiffyDOS v6.01" )
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ROMX_LOAD( "jiffydos 1581.u2", 0x0000, 0x8000, CRC(98873d0f) SHA1(65bbf2be7bcd5bdcbff609d6c66471ffb9d04bfe), ROM_BIOS(4) )
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ROM_END
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//-------------------------------------------------
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// ROM( c1563 )
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//-------------------------------------------------
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ROM_START( c1563 )
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ROM_REGION( 0x8000, M6502_TAG, 0 )
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ROM_LOAD( "1563-rom.bin", 0x0000, 0x8000, CRC(1d184687) SHA1(2c5111a9c15be7b7955f6c8775fea25ec10c0ca0) )
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ROM_END
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//-------------------------------------------------
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// rom_region - device-specific ROM region
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//-------------------------------------------------
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const rom_entry *c1581_device::device_rom_region() const
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{
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switch (m_variant)
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{
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default:
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case TYPE_1581:
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return ROM_NAME( c1581 );
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case TYPE_1563:
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return ROM_NAME( c1563 );
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}
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}
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//-------------------------------------------------
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// ADDRESS_MAP( c1581_mem )
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//-------------------------------------------------
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static ADDRESS_MAP_START( c1581_mem, AS_PROGRAM, 8, c1581_device )
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AM_RANGE(0x0000, 0x1fff) AM_MIRROR(0x2000) AM_RAM
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AM_RANGE(0x4000, 0x400f) AM_MIRROR(0x1ff0) AM_DEVREADWRITE(M8520_TAG, mos8520_device, read, write)
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AM_RANGE(0x6000, 0x6003) AM_MIRROR(0x1ffc) AM_DEVREADWRITE(WD1772_TAG, wd1772_t, read, write)
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AM_RANGE(0x8000, 0xffff) AM_ROM AM_REGION(M6502_TAG, 0)
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ADDRESS_MAP_END
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//-------------------------------------------------
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// MOS8520_INTERFACE( cia_intf )
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//-------------------------------------------------
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WRITE_LINE_MEMBER( c1581_device::cnt_w )
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{
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m_cnt_out = state;
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update_iec();
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}
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WRITE_LINE_MEMBER( c1581_device::sp_w )
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{
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m_sp_out = state;
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update_iec();
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}
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READ8_MEMBER( c1581_device::cia_pa_r )
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{
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/*
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bit description
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PA0
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PA1 /RDY
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PA2
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PA3 DEV# SEL (SW1)
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PA4 DEV# SEL (SW1)
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PA5
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PA6
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PA7 /DISK CHNG
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*/
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UINT8 data = 0;
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// ready
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//data |= !m_floppy->ready_r() << 1;
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// device number
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data |= (m_address - 8) << 3;
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// disk change
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data |= m_floppy->dskchg_r() << 7;
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return data;
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}
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WRITE8_MEMBER( c1581_device::cia_pa_w )
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{
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/*
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bit description
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PA0 SIDE0
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PA1
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PA2 /MOTOR
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PA3
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PA4
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PA5 POWER LED
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PA6 ACT LED
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PA7
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*/
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// side select
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m_floppy->ss_w(BIT(data, 0));
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// motor
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m_floppy->mon_w(BIT(data, 2));
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// power led
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output_set_led_value(LED_POWER, BIT(data, 5));
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// activity led
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output_set_led_value(LED_ACT, BIT(data, 6));
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}
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READ8_MEMBER( c1581_device::cia_pb_r )
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{
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/*
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bit description
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PB0 DATA IN
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PB1
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PB2 CLK IN
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PB3
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PB4
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PB5
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PB6 /WPRT
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PB7 ATN IN
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*/
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UINT8 data = 0;
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// data in
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data = !m_bus->data_r();
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// clock in
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data |= !m_bus->clk_r() << 2;
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// write protect
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data |= !m_floppy->wpt_r() << 6;
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// attention in
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data |= !m_bus->atn_r() << 7;
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return data;
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}
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WRITE8_MEMBER( c1581_device::cia_pb_w )
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{
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/*
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bit description
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PB0
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PB1 DATA OUT
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PB2
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PB3 CLK OUT
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PB4 ATN ACK
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PB5 FAST SER DIR
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PB6
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PB7
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*/
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// data out
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m_data_out = BIT(data, 1);
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// clock out
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m_bus->clk_w(this, !BIT(data, 3));
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// attention acknowledge
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m_atn_ack = BIT(data, 4);
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// fast serial direction
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m_fast_ser_dir = BIT(data, 5);
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update_iec();
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}
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//-------------------------------------------------
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// SLOT_INTERFACE( c1581_floppies )
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//-------------------------------------------------
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static SLOT_INTERFACE_START( c1581_floppies )
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SLOT_INTERFACE( "35dd", FLOPPY_35_DD ) // Chinon F-354-E
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SLOT_INTERFACE_END
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//-------------------------------------------------
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// FLOPPY_FORMATS( c1581_device::floppy_formats )
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//-------------------------------------------------
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FLOPPY_FORMATS_MEMBER( c1581_device::floppy_formats )
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FLOPPY_D81_FORMAT
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FLOPPY_FORMATS_END
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//-------------------------------------------------
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// MACHINE_DRIVER( c1581 )
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//-------------------------------------------------
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static MACHINE_CONFIG_FRAGMENT( c1581 )
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MCFG_CPU_ADD(M6502_TAG, M6502, XTAL_16MHz/8)
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MCFG_CPU_PROGRAM_MAP(c1581_mem)
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MCFG_MOS6526_ADD(M8520_TAG, XTAL_16MHz/8, 0, INPUTLINE(M6502_TAG, INPUT_LINE_IRQ0))
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MCFG_MOS6526_SERIAL_CALLBACKS(DEVWRITELINE(DEVICE_SELF_OWNER, c1581_device, cnt_w), DEVWRITELINE(DEVICE_SELF_OWNER, c1581_device, sp_w))
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MCFG_MOS6526_PORT_A_CALLBACKS(DEVREAD8(DEVICE_SELF_OWNER, c1581_device, cia_pa_r), DEVWRITE8(DEVICE_SELF_OWNER, c1581_device, cia_pa_w))
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MCFG_MOS6526_PORT_B_CALLBACKS(DEVREAD8(DEVICE_SELF_OWNER, c1581_device, cia_pb_r), DEVWRITE8(DEVICE_SELF_OWNER, c1581_device, cia_pb_w), NULL)
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MCFG_WD1772x_ADD(WD1772_TAG, XTAL_16MHz/2)
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MCFG_FLOPPY_DRIVE_ADD(WD1772_TAG":0", c1581_floppies, "35dd", 0, c1581_device::floppy_formats)
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MACHINE_CONFIG_END
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//-------------------------------------------------
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// machine_config_additions - device-specific
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// machine configurations
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//-------------------------------------------------
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machine_config_constructor c1581_device::device_mconfig_additions() const
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{
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return MACHINE_CONFIG_NAME( c1581 );
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}
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//**************************************************************************
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// LIVE DEVICE
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//**************************************************************************
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//-------------------------------------------------
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// c1581_device - constructor
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//-------------------------------------------------
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c1581_device::c1581_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, UINT32 variant)
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: device_t(mconfig, type, name, tag, owner, clock),
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device_cbm_iec_interface(mconfig, *this),
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m_maincpu(*this, M6502_TAG),
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m_cia(*this, M8520_TAG),
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m_fdc(*this, WD1772_TAG),
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m_floppy(*this, WD1772_TAG":0:35dd"),
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m_data_out(0),
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m_atn_ack(0),
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m_fast_ser_dir(0),
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m_sp_out(1),
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m_cnt_out(1),
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m_variant(variant)
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{
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}
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c1581_device::c1581_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
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: device_t(mconfig, C1581, "C1581", tag, owner, clock),
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device_cbm_iec_interface(mconfig, *this),
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m_maincpu(*this, M6502_TAG),
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m_cia(*this, M8520_TAG),
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m_fdc(*this, WD1772_TAG),
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m_floppy(*this, WD1772_TAG":0:35dd"),
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m_data_out(0),
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m_atn_ack(0),
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m_fast_ser_dir(0),
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m_sp_out(1),
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m_cnt_out(1),
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m_variant(TYPE_1581)
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{
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}
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//-------------------------------------------------
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// c1563_device - constructor
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//-------------------------------------------------
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c1563_device::c1563_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
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: c1581_device(mconfig, C1563, "C1563", tag, owner, clock, TYPE_1563) { }
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//-------------------------------------------------
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// device_start - device-specific startup
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//-------------------------------------------------
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void c1581_device::device_start()
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{
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// state saving
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save_item(NAME(m_data_out));
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save_item(NAME(m_atn_ack));
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save_item(NAME(m_fast_ser_dir));
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save_item(NAME(m_sp_out));
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save_item(NAME(m_cnt_out));
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}
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//-------------------------------------------------
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// device_reset - device-specific reset
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//-------------------------------------------------
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void c1581_device::device_reset()
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{
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m_maincpu->reset();
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m_cia->reset();
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m_fdc->reset();
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m_fdc->set_floppy(m_floppy);
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m_fdc->dden_w(0);
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m_sp_out = 1;
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m_cnt_out = 1;
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update_iec();
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}
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//-------------------------------------------------
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// cbm_iec_srq -
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//-------------------------------------------------
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void c1581_device::cbm_iec_srq(int state)
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{
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update_iec();
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}
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//-------------------------------------------------
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// cbm_iec_atn -
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//-------------------------------------------------
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void c1581_device::cbm_iec_atn(int state)
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{
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update_iec();
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}
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//-------------------------------------------------
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// cbm_iec_data -
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//-------------------------------------------------
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void c1581_device::cbm_iec_data(int state)
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{
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update_iec();
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}
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//-------------------------------------------------
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// cbm_iec_reset -
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//-------------------------------------------------
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void c1581_device::cbm_iec_reset(int state)
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{
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if (!state)
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{
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device_reset();
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}
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}
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//-------------------------------------------------
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// update_iec -
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//-------------------------------------------------
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void c1581_device::update_iec()
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{
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m_cia->cnt_w(m_fast_ser_dir || m_bus->srq_r());
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m_cia->sp_w(m_fast_ser_dir || m_bus->data_r());
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int atn = m_bus->atn_r();
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m_cia->flag_w(atn);
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// serial data
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int data = !m_data_out && !(m_atn_ack && !atn);
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if (m_fast_ser_dir) data &= m_sp_out;
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m_bus->data_w(this, data);
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// fast clock
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int srq = 1;
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if (m_fast_ser_dir) srq &= m_cnt_out;
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m_bus->srq_w(this, srq);
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}
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