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Diffstat (limited to 'src/mame/drivers/pulsar.c')
-rw-r--r-- | src/mame/drivers/pulsar.c | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/src/mame/drivers/pulsar.c b/src/mame/drivers/pulsar.c new file mode 100644 index 00000000000..b44cc9c8e6a --- /dev/null +++ b/src/mame/drivers/pulsar.c @@ -0,0 +1,263 @@ +// license:BSD-3-Clause +// copyright-holders:Robbbert +/*************************************************************************** + +Pulsar Little Big Board + +2013-12-29 Skeleton driver. + +Chips: Z80A @4MHz, Z80DART, FD1797-02, 8255A-5, AY-5-8116, MSM5832. +Crystals: 4 MHz, 5.0688 MHz, 32768. + +This is a complete CP/M single-board computer. You needed to supply your own +power supply and serial terminal. + +The terminal must be set for 9600 baud, 7 bits, even parity, 1 stop bit. + + +ToDo: +- Need software + + +Monitor Commands: +B - Boot from disk +D - Dump memory +F - Fill memory +G - Go +I - In port +L - Load bootstrap from drive A to 0x80 +M - Modify memory +O - Out port +P - choose which rs232 channel for the console +T - Test memory +V - Move memory +X - Test off-board memory banks + +****************************************************************************/ + +#include "bus/rs232/rs232.h" +#include "cpu/z80/z80.h" +#include "cpu/z80/z80daisy.h" +#include "machine/z80dart.h" +#include "machine/msm5832.h" +#include "machine/i8255.h" +#include "machine/com8116.h" +#include "machine/wd_fdc.h" + + +class pulsar_state : public driver_device +{ +public: + pulsar_state(const machine_config &mconfig, device_type type, const char *tag) : + driver_device(mconfig, type, tag), + m_maincpu(*this, "maincpu"), + m_dart(*this, "z80dart"), + m_brg(*this, "brg"), + m_fdc (*this, "fdc"), + m_floppy0(*this, "fdc:0"), + m_rtc(*this, "rtc") + { + } + + DECLARE_DRIVER_INIT(pulsar); + DECLARE_MACHINE_RESET(pulsar); + TIMER_CALLBACK_MEMBER(pulsar_reset); + DECLARE_WRITE8_MEMBER(baud_w); + DECLARE_WRITE_LINE_MEMBER(fr_w); + DECLARE_WRITE_LINE_MEMBER(ft_w); + DECLARE_WRITE8_MEMBER(ppi_pa_w); + DECLARE_WRITE8_MEMBER(ppi_pb_w); + DECLARE_WRITE8_MEMBER(ppi_pc_w); + DECLARE_READ8_MEMBER(ppi_pc_r); + +private: + floppy_image_device *m_floppy; + required_device<cpu_device> m_maincpu; + required_device<z80dart_device> m_dart; + required_device<com8116_device> m_brg; + required_device<fd1797_t> m_fdc; + required_device<floppy_connector> m_floppy0; + required_device<msm5832_device> m_rtc; +}; + +static ADDRESS_MAP_START(pulsar_mem, AS_PROGRAM, 8, pulsar_state) + ADDRESS_MAP_UNMAP_HIGH + AM_RANGE(0x0000, 0x07ff) AM_READ_BANK("bankr0") AM_WRITE_BANK("bankw0") + AM_RANGE(0x0800, 0xf7ff) AM_RAM + AM_RANGE(0xf800, 0xffff) AM_READ_BANK("bankr1") AM_WRITE_BANK("bankw1") +ADDRESS_MAP_END + +static ADDRESS_MAP_START(pulsar_io, AS_IO, 8, pulsar_state) + ADDRESS_MAP_UNMAP_HIGH + ADDRESS_MAP_GLOBAL_MASK(0xff) + AM_RANGE(0xc0, 0xc3) AM_MIRROR(0x0c) AM_DEVREADWRITE("z80dart", z80dart_device, ba_cd_r, ba_cd_w) + AM_RANGE(0xd0, 0xd3) AM_MIRROR(0x0c) AM_DEVREADWRITE("fdc", fd1797_t, read, write) + AM_RANGE(0xe0, 0xe3) AM_MIRROR(0x0c) AM_DEVREADWRITE("ppi", i8255_device, read, write) + AM_RANGE(0xf0, 0xff) AM_WRITE(baud_w) +ADDRESS_MAP_END + +// Schematic has the labels for FT and FR the wrong way around, +// the pin numbers are correct. +WRITE_LINE_MEMBER( pulsar_state::fr_w ) +{ + m_dart->rxca_w(state); + m_dart->txca_w(state); +} + +WRITE_LINE_MEMBER( pulsar_state::ft_w ) +{ + m_dart->rxcb_w(state); + m_dart->txcb_w(state); +} + +WRITE8_MEMBER( pulsar_state::baud_w ) +{ + m_brg->str_w(data & 0x0f); + m_brg->stt_w(data >> 4); +} + +/* after the first 4 bytes have been read from ROM, switch the ram back in */ +TIMER_CALLBACK_MEMBER( pulsar_state::pulsar_reset) +{ + membank("bankr0")->set_entry(1); +} + +static const z80_daisy_config daisy_chain_intf[] = +{ + { "z80dart" }, + { NULL } +}; + +/* +d0..d3 Drive select 0-3 (we only emulate 1 drive) +d4 Side select 0=side0 +d5 /DDEN +d6 /DSK_WAITEN (don't know what this is, not emulated) +d7 XMEMEX line (for external memory, not emulated) +*/ +WRITE8_MEMBER( pulsar_state::ppi_pa_w ) +{ + m_floppy = NULL; + if (BIT(data, 0)) m_floppy = m_floppy0->get_device(); + m_fdc->set_floppy(m_floppy); + m_fdc->dden_w(BIT(data, 5)); +} + +/* +d0..d3 RTC address +d4 RTC read line (inverted in emulation) +d5 RTC write line (inverted in emulation) +d6 RTC hold line +d7 Allow 64k of ram +*/ +WRITE8_MEMBER( pulsar_state::ppi_pb_w ) +{ + m_rtc->address_w(data & 0x0f); + m_rtc->read_w(!BIT(data, 4)); + m_rtc->write_w(!BIT(data, 5)); + m_rtc->hold_w(BIT(data, 6)); + membank("bankr1")->set_entry(BIT(data, 7)); +} + +/* +d0..d3 Data lines to rtc +d7 /2 SIDES (assumed to be side select) +*/ +WRITE8_MEMBER( pulsar_state::ppi_pc_w ) +{ + m_rtc->data_w(space, 0, data & 15); + if (m_floppy) + m_floppy->ss_w(BIT(data, 7)); +} + +READ8_MEMBER( pulsar_state::ppi_pc_r ) +{ + return m_rtc->data_r(space, 0); +} + +static DEVICE_INPUT_DEFAULTS_START( terminal ) + DEVICE_INPUT_DEFAULTS( "RS232_TXBAUD", 0xff, RS232_BAUD_9600 ) + DEVICE_INPUT_DEFAULTS( "RS232_RXBAUD", 0xff, RS232_BAUD_9600 ) + DEVICE_INPUT_DEFAULTS( "RS232_STARTBITS", 0xff, RS232_STARTBITS_1 ) + DEVICE_INPUT_DEFAULTS( "RS232_DATABITS", 0xff, RS232_DATABITS_7 ) + DEVICE_INPUT_DEFAULTS( "RS232_PARITY", 0xff, RS232_PARITY_EVEN ) + DEVICE_INPUT_DEFAULTS( "RS232_STOPBITS", 0xff, RS232_STOPBITS_1 ) +DEVICE_INPUT_DEFAULTS_END + +static SLOT_INTERFACE_START( pulsar_floppies ) + SLOT_INTERFACE( "525dd", FLOPPY_525_DD ) +SLOT_INTERFACE_END + +/* Input ports */ +static INPUT_PORTS_START( pulsar ) +INPUT_PORTS_END + +MACHINE_RESET_MEMBER( pulsar_state, pulsar ) +{ + machine().scheduler().timer_set(attotime::from_usec(3), timer_expired_delegate(FUNC(pulsar_state::pulsar_reset),this)); + membank("bankr0")->set_entry(0); // point at rom + membank("bankw0")->set_entry(0); // always write to ram + membank("bankr1")->set_entry(1); // point at rom + membank("bankw1")->set_entry(0); // always write to ram + m_rtc->cs_w(1); // always enabled +} + +DRIVER_INIT_MEMBER( pulsar_state, pulsar ) +{ + UINT8 *main = memregion("maincpu")->base(); + + membank("bankr0")->configure_entry(1, &main[0x0000]); + membank("bankr0")->configure_entry(0, &main[0x10000]); + membank("bankw0")->configure_entry(0, &main[0x0000]); + + membank("bankr1")->configure_entry(0, &main[0xf800]); + membank("bankr1")->configure_entry(1, &main[0x10000]); + membank("bankw1")->configure_entry(0, &main[0xf800]); +} + +static MACHINE_CONFIG_START( pulsar, pulsar_state ) + /* basic machine hardware */ + MCFG_CPU_ADD("maincpu",Z80, XTAL_4MHz) + MCFG_CPU_PROGRAM_MAP(pulsar_mem) + MCFG_CPU_IO_MAP(pulsar_io) + MCFG_CPU_CONFIG(daisy_chain_intf) + MCFG_MACHINE_RESET_OVERRIDE(pulsar_state, pulsar) + + /* Devices */ + MCFG_DEVICE_ADD("ppi", I8255, 0) + MCFG_I8255_OUT_PORTA_CB(WRITE8(pulsar_state, ppi_pa_w)) + MCFG_I8255_OUT_PORTB_CB(WRITE8(pulsar_state, ppi_pb_w)) + MCFG_I8255_IN_PORTC_CB(READ8(pulsar_state, ppi_pc_r)) + MCFG_I8255_OUT_PORTC_CB(WRITE8(pulsar_state, ppi_pc_w)) + + MCFG_MSM5832_ADD("rtc", XTAL_32_768kHz) + + MCFG_Z80DART_ADD("z80dart", XTAL_4MHz, 0, 0, 0, 0 ) + MCFG_Z80DART_OUT_TXDA_CB(DEVWRITELINE("rs232", rs232_port_device, write_txd)) + MCFG_Z80DART_OUT_DTRA_CB(DEVWRITELINE("rs232", rs232_port_device, write_dtr)) + MCFG_Z80DART_OUT_RTSA_CB(DEVWRITELINE("rs232", rs232_port_device, write_rts)) + MCFG_Z80DART_OUT_INT_CB(INPUTLINE("maincpu", INPUT_LINE_IRQ0)) + + MCFG_RS232_PORT_ADD("rs232", default_rs232_devices, "terminal") + MCFG_RS232_RXD_HANDLER(DEVWRITELINE("z80dart", z80dart_device, rxa_w)) + MCFG_RS232_CTS_HANDLER(DEVWRITELINE("z80dart", z80dart_device, ctsa_w)) + MCFG_DEVICE_CARD_DEVICE_INPUT_DEFAULTS("terminal", terminal) + + MCFG_DEVICE_ADD("brg", COM8116, XTAL_5_0688MHz) + MCFG_COM8116_FR_HANDLER(WRITELINE(pulsar_state, fr_w)) + MCFG_COM8116_FT_HANDLER(WRITELINE(pulsar_state, ft_w)) + + MCFG_FD1797_ADD("fdc", XTAL_4MHz / 2) + MCFG_FLOPPY_DRIVE_ADD("fdc:0", pulsar_floppies, "525dd", floppy_image_device::default_floppy_formats) +MACHINE_CONFIG_END + +/* ROM definition */ +ROM_START( pulsarlb ) + ROM_REGION( 0x10800, "maincpu", ROMREGION_ERASEFF ) + ROM_LOAD( "mp7a.bin", 0x10000, 0x800, CRC(726b8a19) SHA1(43b2af84d5622c1f67584c501b730acf002a6113) ) +ROM_END + +/* Driver */ + +/* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */ +COMP( 1981, pulsarlb, 0, 0, pulsar, pulsar, pulsar_state, pulsar, "Pulsar", "Little Big Board", MACHINE_NO_SOUND_HW) |