summaryrefslogtreecommitdiffstatshomepage
path: root/src/mess/machine/c1581.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/mess/machine/c1581.c')
-rw-r--r--src/mess/machine/c1581.c503
1 files changed, 503 insertions, 0 deletions
diff --git a/src/mess/machine/c1581.c b/src/mess/machine/c1581.c
new file mode 100644
index 00000000000..f1c649538db
--- /dev/null
+++ b/src/mess/machine/c1581.c
@@ -0,0 +1,503 @@
+/**********************************************************************
+
+ Commodore 1581/1563 Single Disk Drive emulation
+
+ Copyright MESS Team.
+ Visit http://mamedev.org for licensing and usage restrictions.
+
+**********************************************************************/
+
+#include "c1581.h"
+
+
+
+//**************************************************************************
+// MACROS / CONSTANTS
+//**************************************************************************
+
+#define M6502_TAG "u1"
+#define M8520_TAG "u5"
+#define WD1770_TAG "u4"
+
+
+enum
+{
+ LED_POWER = 0,
+ LED_ACT
+};
+
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type C1563 = &device_creator<c1563_device>;
+const device_type C1581 = &device_creator<c1581_device>;
+
+
+//-------------------------------------------------
+// device_config_complete - perform any
+// operations now that the configuration is
+// complete
+//-------------------------------------------------
+
+void base_c1581_device::device_config_complete()
+{
+ switch (m_variant)
+ {
+ default:
+ case TYPE_1581:
+ m_shortname = "c1581";
+ break;
+
+ case TYPE_1563:
+ m_shortname = "c1563";
+ break;
+ }
+}
+
+
+//-------------------------------------------------
+// ROM( c1581 )
+//-------------------------------------------------
+
+ROM_START( c1581 )
+ ROM_REGION( 0x8000, M6502_TAG, 0 )
+ ROM_DEFAULT_BIOS("r2")
+ ROM_SYSTEM_BIOS( 0, "beta", "Beta" )
+ ROMX_LOAD( "beta.u2", 0x0000, 0x8000, CRC(ecc223cd) SHA1(a331d0d46ead1f0275b4ca594f87c6694d9d9594), ROM_BIOS(1) )
+ ROM_SYSTEM_BIOS( 1, "r1", "Revision 1" )
+ ROMX_LOAD( "318045-01.u2", 0x0000, 0x8000, CRC(113af078) SHA1(3fc088349ab83e8f5948b7670c866a3c954e6164), ROM_BIOS(2) )
+ ROM_SYSTEM_BIOS( 2, "r2", "Revision 2" )
+ ROMX_LOAD( "318045-02.u2", 0x0000, 0x8000, CRC(a9011b84) SHA1(01228eae6f066bd9b7b2b6a7fa3f667e41dad393), ROM_BIOS(3) )
+ ROM_SYSTEM_BIOS( 3, "jiffydos", "JiffyDOS v6.01" )
+ ROMX_LOAD( "jiffydos 1581.u2", 0x0000, 0x8000, CRC(98873d0f) SHA1(65bbf2be7bcd5bdcbff609d6c66471ffb9d04bfe), ROM_BIOS(4) )
+ROM_END
+
+
+//-------------------------------------------------
+// ROM( c1563 )
+//-------------------------------------------------
+
+ROM_START( c1563 )
+ ROM_REGION( 0x8000, M6502_TAG, 0 )
+ ROM_LOAD( "1563-rom.bin", 0x0000, 0x8000, CRC(1d184687) SHA1(2c5111a9c15be7b7955f6c8775fea25ec10c0ca0) )
+ROM_END
+
+
+//-------------------------------------------------
+// rom_region - device-specific ROM region
+//-------------------------------------------------
+
+const rom_entry *base_c1581_device::device_rom_region() const
+{
+ switch (m_variant)
+ {
+ default:
+ case TYPE_1581:
+ return ROM_NAME( c1581 );
+
+ case TYPE_1563:
+ return ROM_NAME( c1563 );
+ }
+}
+
+
+//-------------------------------------------------
+// ADDRESS_MAP( c1581_mem )
+//-------------------------------------------------
+
+static ADDRESS_MAP_START( c1581_mem, AS_PROGRAM, 8, base_c1581_device )
+ AM_RANGE(0x0000, 0x1fff) AM_MIRROR(0x2000) AM_RAM
+ AM_RANGE(0x4000, 0x400f) AM_MIRROR(0x1ff0) AM_DEVREADWRITE_LEGACY(M8520_TAG, mos6526_r, mos6526_w)
+ AM_RANGE(0x6000, 0x6003) AM_MIRROR(0x1ffc) AM_DEVREADWRITE_LEGACY(WD1770_TAG, wd17xx_r, wd17xx_w)
+ AM_RANGE(0x8000, 0xffff) AM_ROM AM_REGION(M6502_TAG, 0)
+ADDRESS_MAP_END
+
+
+//-------------------------------------------------
+// MOS8520_INTERFACE( cia_intf )
+//-------------------------------------------------
+
+WRITE_LINE_MEMBER( base_c1581_device::cnt_w )
+{
+ // fast serial clock out
+ m_cnt_out = state;
+
+ set_iec_srq();
+}
+
+WRITE_LINE_MEMBER( base_c1581_device::sp_w )
+{
+ // fast serial data out
+ m_sp_out = state;
+
+ set_iec_data();
+}
+
+READ8_MEMBER( base_c1581_device::cia_pa_r )
+{
+ /*
+
+ bit description
+
+ PA0
+ PA1 /RDY
+ PA2
+ PA3 DEV# SEL (SW1)
+ PA4 DEV# SEL (SW1)
+ PA5
+ PA6
+ PA7 /DISK CHNG
+
+ */
+
+ UINT8 data = 0;
+
+ // ready
+ data |= !(floppy_drive_get_flag_state(m_image, FLOPPY_DRIVE_READY) == FLOPPY_DRIVE_READY) << 1;
+
+ // device number
+ data |= (m_address - 8) << 3;
+
+ // disk change
+ data |= floppy_dskchg_r(m_image) << 7;
+
+ return data;
+}
+
+WRITE8_MEMBER( base_c1581_device::cia_pa_w )
+{
+ /*
+
+ bit description
+
+ PA0 SIDE0
+ PA1
+ PA2 /MOTOR
+ PA3
+ PA4
+ PA5 POWER LED
+ PA6 ACT LED
+ PA7
+
+ */
+
+ // side 0
+ wd17xx_set_side(m_fdc, !BIT(data, 0));
+
+ // motor
+ int motor = BIT(data, 2);
+ floppy_mon_w(m_image, motor);
+ floppy_drive_set_ready_state(m_image, !motor, 1);
+
+ // power led
+ output_set_led_value(LED_POWER, BIT(data, 5));
+
+ // activity led
+ output_set_led_value(LED_ACT, BIT(data, 6));
+}
+
+READ8_MEMBER( base_c1581_device::cia_pb_r )
+{
+ /*
+
+ bit description
+
+ PB0 DATA IN
+ PB1
+ PB2 CLK IN
+ PB3
+ PB4
+ PB5
+ PB6 /WPRT
+ PB7 ATN IN
+
+ */
+
+ UINT8 data = 0;
+
+ // data in
+ data = !m_bus->data_r();
+
+ // clock in
+ data |= !m_bus->clk_r() << 2;
+
+ // write protect
+ data |= !floppy_wpt_r(m_image) << 6;
+
+ // attention in
+ data |= !m_bus->atn_r() << 7;
+
+ return data;
+}
+
+WRITE8_MEMBER( base_c1581_device::cia_pb_w )
+{
+ /*
+
+ bit description
+
+ PB0
+ PB1 DATA OUT
+ PB2
+ PB3 CLK OUT
+ PB4 ATN ACK
+ PB5 FAST SER DIR
+ PB6
+ PB7
+
+ */
+
+ // data out
+ m_data_out = BIT(data, 1);
+
+ // clock out
+ m_bus->clk_w(this, !BIT(data, 3));
+
+ // attention acknowledge
+ m_atn_ack = BIT(data, 4);
+
+ // fast serial direction
+ m_fast_ser_dir = BIT(data, 5);
+
+ set_iec_data();
+ set_iec_srq();
+}
+
+static MOS8520_INTERFACE( cia_intf )
+{
+ XTAL_16MHz/8,
+ DEVCB_CPU_INPUT_LINE(M6502_TAG, INPUT_LINE_IRQ0),
+ DEVCB_NULL,
+ DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, base_c1581_device, cnt_w),
+ DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, base_c1581_device, sp_w),
+ DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, base_c1581_device, cia_pa_r),
+ DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, base_c1581_device, cia_pa_w),
+ DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, base_c1581_device, cia_pb_r),
+ DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, base_c1581_device, cia_pb_w)
+};
+
+
+//-------------------------------------------------
+// wd17xx_interface fdc_intf
+//-------------------------------------------------
+
+static const wd17xx_interface fdc_intf =
+{
+ DEVCB_LINE_GND,
+ DEVCB_NULL,
+ DEVCB_NULL,
+ { FLOPPY_0, NULL, NULL, NULL }
+};
+
+
+//-------------------------------------------------
+// LEGACY_FLOPPY_OPTIONS( c1581 )
+//-------------------------------------------------
+
+static LEGACY_FLOPPY_OPTIONS_START( c1581 )
+ LEGACY_FLOPPY_OPTION( c1581, "d81", "Commodore 1581 Disk Image", d81_dsk_identify, d81_dsk_construct, NULL, NULL )
+LEGACY_FLOPPY_OPTIONS_END
+
+
+//-------------------------------------------------
+// floppy_interface c1581_floppy_interface
+//-------------------------------------------------
+
+static const floppy_interface c1581_floppy_interface =
+{
+ DEVCB_NULL,
+ DEVCB_NULL,
+ DEVCB_NULL,
+ DEVCB_NULL,
+ DEVCB_NULL,
+ FLOPPY_STANDARD_3_5_DSDD,
+ LEGACY_FLOPPY_OPTIONS_NAME(c1581),
+ "floppy_3_5",
+ NULL
+};
+
+
+//-------------------------------------------------
+// MACHINE_DRIVER( c1581 )
+//-------------------------------------------------
+
+static MACHINE_CONFIG_FRAGMENT( c1581 )
+ MCFG_CPU_ADD(M6502_TAG, M6502, XTAL_16MHz/8)
+ MCFG_CPU_PROGRAM_MAP(c1581_mem)
+
+ MCFG_MOS8520_ADD(M8520_TAG, XTAL_16MHz/8, cia_intf)
+ MCFG_WD1770_ADD(WD1770_TAG, /*XTAL_16MHz/2,*/ fdc_intf)
+
+ MCFG_LEGACY_FLOPPY_DRIVE_ADD(FLOPPY_0, c1581_floppy_interface)
+MACHINE_CONFIG_END
+
+
+//-------------------------------------------------
+// machine_config_additions - device-specific
+// machine configurations
+//-------------------------------------------------
+
+machine_config_constructor base_c1581_device::device_mconfig_additions() const
+{
+ return MACHINE_CONFIG_NAME( c1581 );
+}
+
+
+
+//**************************************************************************
+// INLINE HELPERS
+//**************************************************************************
+
+//-------------------------------------------------
+// base_c1581_device - constructor
+//-------------------------------------------------
+
+inline void base_c1581_device::set_iec_data()
+{
+ int atn = m_bus->atn_r();
+ int data = !m_data_out && !(m_atn_ack && !atn);
+
+ // fast serial data
+ if (m_fast_ser_dir) data &= m_sp_out;
+
+ m_bus->data_w(this, data);
+}
+
+
+//-------------------------------------------------
+// base_c1581_device - constructor
+//-------------------------------------------------
+
+inline void base_c1581_device::set_iec_srq()
+{
+ int srq = 1;
+
+ // fast serial clock
+ if (m_fast_ser_dir) srq &= m_cnt_out;
+
+ m_bus->srq_w(this, srq);
+}
+
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// base_c1581_device - constructor
+//-------------------------------------------------
+
+base_c1581_device::base_c1581_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, UINT32 variant)
+ : device_t(mconfig, type, name, tag, owner, clock),
+ device_cbm_iec_interface(mconfig, *this),
+ m_maincpu(*this, M6502_TAG),
+ m_cia(*this, M8520_TAG),
+ m_fdc(*this, WD1770_TAG),
+ m_image(*this, FLOPPY_0),
+ m_variant(variant)
+{
+}
+
+
+//-------------------------------------------------
+// c1563_device - constructor
+//-------------------------------------------------
+
+c1563_device::c1563_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : base_c1581_device(mconfig, C1563, "C1563", tag, owner, clock, TYPE_1563) { }
+
+
+//-------------------------------------------------
+// c1581_device - constructor
+//-------------------------------------------------
+
+c1581_device::c1581_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : base_c1581_device(mconfig, C1581, "C1581", tag, owner, clock, TYPE_1581) { }
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void base_c1581_device::device_start()
+{
+ // state saving
+ save_item(NAME(m_data_out));
+ save_item(NAME(m_atn_ack));
+ save_item(NAME(m_fast_ser_dir));
+ save_item(NAME(m_sp_out));
+ save_item(NAME(m_cnt_out));
+}
+
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void base_c1581_device::device_reset()
+{
+ m_maincpu->reset();
+
+ m_cia->reset();
+
+ wd17xx_mr_w(m_fdc, 0);
+ wd17xx_mr_w(m_fdc, 1);
+
+ m_sp_out = 1;
+ m_cnt_out = 1;
+}
+
+
+//-------------------------------------------------
+// cbm_iec_srq -
+//-------------------------------------------------
+
+void base_c1581_device::cbm_iec_srq(int state)
+{
+ if (!m_fast_ser_dir)
+ {
+ m_cia->cnt_w(state);
+ }
+}
+
+
+//-------------------------------------------------
+// cbm_iec_atn -
+//-------------------------------------------------
+
+void base_c1581_device::cbm_iec_atn(int state)
+{
+ m_cia->flag_w(state);
+
+ set_iec_data();
+}
+
+
+//-------------------------------------------------
+// cbm_iec_data -
+//-------------------------------------------------
+
+void base_c1581_device::cbm_iec_data(int state)
+{
+ if (!m_fast_ser_dir)
+ {
+ m_cia->sp_w(state);
+ }
+}
+
+
+//-------------------------------------------------
+// cbm_iec_reset -
+//-------------------------------------------------
+
+void base_c1581_device::cbm_iec_reset(int state)
+{
+ if (!state)
+ {
+ device_reset();
+ }
+}