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author Miodrag Milanovic <mmicko@gmail.com>2012-08-21 10:41:19 +0000
committer Miodrag Milanovic <mmicko@gmail.com>2012-08-21 10:41:19 +0000
commit7285b359d259b2ae0fdf85096571c386ec8c991a (patch)
treea027aff57f1a255f9ec6cfd3b68cabe4b6683998 /src/mess/machine/c8280.c
parent67c425e90757876a6716b7867df30c0149912e74 (diff)
Merge of MESS sources (no whatsnew)
Diffstat (limited to 'src/mess/machine/c8280.c')
-rw-r--r--src/mess/machine/c8280.c451
1 files changed, 451 insertions, 0 deletions
diff --git a/src/mess/machine/c8280.c b/src/mess/machine/c8280.c
new file mode 100644
index 00000000000..9a658b88b49
--- /dev/null
+++ b/src/mess/machine/c8280.c
@@ -0,0 +1,451 @@
+/**********************************************************************
+
+ 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();
+ }
+}