diff options
Diffstat (limited to 'src/mame/machine/z80ne.cpp')
-rw-r--r-- | src/mame/machine/z80ne.cpp | 697 |
1 files changed, 0 insertions, 697 deletions
diff --git a/src/mame/machine/z80ne.cpp b/src/mame/machine/z80ne.cpp deleted file mode 100644 index af61fde4a04..00000000000 --- a/src/mame/machine/z80ne.cpp +++ /dev/null @@ -1,697 +0,0 @@ -// license:BSD-3-Clause -// copyright-holders:Roberto Lavarone -/*********************************************************************** - - machine/z80ne.c - - Functions to emulate general aspects of the machine (RAM, ROM, - interrupts, I/O ports) - -***********************************************************************/ - -/* Core includes */ -#include "emu.h" -#include "includes/z80ne.h" - -//#define VERBOSE 1 -#include "logmacro.h" - - - - - -/* timer to read cassette waveforms */ - -cassette_image_device* z80ne_state::cassette_device_image() -{ - if (m_lx385_ctrl & 0x08) - return m_cassette2; - else - return m_cassette1; -} - -TIMER_CALLBACK_MEMBER(z80ne_state::z80ne_cassette_tc) -{ - uint8_t cass_ws = 0; - m_cass_data.input.length++; - - cass_ws = ((cassette_device_image())->input() > +0.02) ? 1 : 0; - - if ((cass_ws ^ m_cass_data.input.level) & cass_ws) - { - m_cass_data.input.level = cass_ws; - m_cass_data.input.bit = ((m_cass_data.input.length < m_cass_data.wave_filter) || (m_cass_data.input.length > 0x20)) ? 1 : 0; - m_cass_data.input.length = 0; - m_uart->write_si(m_cass_data.input.bit); - } - m_cass_data.input.level = cass_ws; - - /* saving a tape - convert the serial stream from the uart */ - - m_cass_data.output.length--; - - if (!(m_cass_data.output.length)) - { - if (m_cass_data.output.level) - m_cass_data.output.level = 0; - else - { - m_cass_data.output.level=1; - cass_ws = m_uart->so_r(); - m_cass_data.wave_length = cass_ws ? m_cass_data.wave_short : m_cass_data.wave_long; - } - cassette_device_image()->output(m_cass_data.output.level ? -1.0 : +1.0); - m_cass_data.output.length = m_cass_data.wave_length; - } -} - -void z80ne_state::save_state_vars() -{ - save_item(NAME(m_lx383_scan_counter)); - save_item(NAME(m_lx383_key)); - save_item(NAME(m_lx383_downsampler)); - save_item(NAME(m_lx385_ctrl)); -} - -void z80ne_state::init_z80ne() -{ - save_state_vars(); -} - -void z80netf_state::driver_init() -{ - save_state_vars(); - - /* first two entries point to rom on reset */ - u8 *r = m_ram->pointer(); - m_bank1->configure_entry(0, r); /* RAM at 0x0000-0x03FF */ - m_bank1->configure_entries(1, 3, m_rom+0x4400, 0x0400); /* ep390, ep1390, ep2390 at 0x0000-0x03FF */ - m_bank1->configure_entry(4, m_rom+0x4000); /* ep382 at 0x0000-0x03FF */ - m_bank1->configure_entry(5, m_rom); /* ep548 at 0x0000-0x03FF */ - - m_bank2->configure_entry(0, r+0x0400); /* RAM at 0x0400 */ - m_bank2->configure_entry(1, m_rom+0x0400); /* ep548 at 0x0400-0x3FFF */ - - m_bank3->configure_entry(0, r+0x4000); /* RAM at 0x8000 */ - m_bank3->configure_entry(1, m_rom+0x4000); /* ep382 at 0x8000 */ - - m_bank4->configure_entry(0, r+0x5000); /* RAM at 0xF000 */ - m_bank4->configure_entries(1, 3, m_rom+0x4400, 0x0400); /* ep390, ep1390, ep2390 at 0xF000 */ - -} - -TIMER_CALLBACK_MEMBER(z80ne_state::z80ne_kbd_scan) -{ - /* - * NE555 is connected to a 74LS93 binary counter - * 74LS93 output: - * QA-QC: column index for LEDs and keyboard - * QD: keyboard row select - * - * Port F0 input bit assignment: - * 0 QA bits 0..3 of row counter - * 1 QB - * 2 QC - * 3 QD - * 4 Control button pressed, active high - * 5 Always low - * 6 Always low - * 7 Selected button pressed, active low - * - * - */ - - uint16_t key_bits; - uint8_t ctrl; //, rst; - uint8_t i; - - /* 4-bit counter */ - --m_lx383_scan_counter; - m_lx383_scan_counter &= 0x0f; - - if ( --m_lx383_downsampler == 0 ) - { - m_lx383_downsampler = LX383_DOWNSAMPLING; - key_bits = (m_io_row1->read() << 8) | m_io_row0->read(); -// rst = m_io_rst->read(); - ctrl = m_io_ctrl->read(); - - for ( i = 0; i<LX383_KEYS; i++) - { - m_lx383_key[i] = ( i | (key_bits & 0x01 ? 0x80 : 0x00) | ~ctrl); - key_bits >>= 1; - } - } -} - -void z80ne_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) -{ - switch (id) - { - case 0: - m_maincpu->pulse_input_line(INPUT_LINE_NMI, attotime::zero); - break; - default: - printf("Invalid timer %d encountered\n",id); - } -} - -void z80net_state::reset_lx387() -{ - m_lx387_kr2376->set_input_pin( kr2376_device::KR2376_DSII, 0); - m_lx387_kr2376->set_input_pin( kr2376_device::KR2376_PII, 0); -} - -void z80netf_state::reset_lx390_banking() -{ - switch (m_io_config->read() & 0x07) - { - case 0x01: /* EP382 Hex Monitor */ - if (VERBOSE) - logerror("reset_lx390_banking: banking ep382\n"); - m_bank1->set_entry(4); /* ep382 at 0x0000 for 3 cycles, then RAM */ - m_bank2->set_entry(0); /* RAM at 0x0400 */ - m_bank3->set_entry(1); /* ep382 at 0x8000 */ - m_bank4->set_entry(0); /* RAM at 0xF000 */ - break; - case 0x02: /* EP548 16k BASIC */ - if (VERBOSE) - logerror("reset_lx390_banking: banking ep548\n"); - m_bank1->set_entry(5); /* ep548 at 0x0000-0x03FF */ - m_bank2->set_entry(1); /* ep548 at 0x0400-0x3FFF */ - m_bank3->set_entry(0); /* RAM at 0x8000 */ - m_bank4->set_entry(0); /* RAM at 0xF000 */ - break; - case 0x03: /* EP390 Boot Loader for 5.5k floppy BASIC */ - if (VERBOSE) - logerror("reset_lx390_banking: banking ep390\n"); - m_bank1->set_entry(1); /* ep390 at 0x0000-0 x03FF for 3 cycles, then RAM */ - m_bank2->set_entry(0); /* RAM at 0x0400-0x3FFF */ - m_bank3->set_entry(0); /* RAM at 0x8000 */ - m_bank4->set_entry(1); /* ep390 at 0xF000 */ - break; - case 0x04: /* EP1390 Boot Loader for NE DOS 1.0/1.5 */ - if (VERBOSE) - logerror("reset_lx390_banking: banking ep1390\n"); - m_bank1->set_entry(2); /* ep1390 at 0x0000-0x03FF for 3 cycles, then RAM */ - m_bank2->set_entry(0); /* RAM at 0x0400-0x3FFF */ - m_bank3->set_entry(0); /* RAM at 0x8000 */ - m_bank4->set_entry(2); /* ep1390 at 0xF000 */ - break; - case 0x05: /* EP2390 Boot Loader for NE DOS G.1 */ - if (VERBOSE) - logerror("reset_lx390_banking: banking ep2390\n"); - m_bank1->set_entry(3); /* ep2390 at 0x0000-0x03FF for 3 cycles, then RAM */ - m_bank2->set_entry(0); /* RAM at 0x0400-0x3FFF */ - m_bank3->set_entry(0); /* RAM at 0x8000 */ - m_bank4->set_entry(3); /* ep2390 at 0xF000 */ - break; - } - - /* TODO: in real hardware the ENH bus line is pulled down - * until a I/O read is performed on a address with A0 address bit low and A1 or A2 address bit high - */ -} - -void z80ne_state::base_reset() -{ - for (int i = 0; i < LX383_KEYS; i++) - m_lx383_key[i] = 0xf0 | i; - m_lx383_scan_counter = 0x0f; - m_lx383_downsampler = LX383_DOWNSAMPLING; - - /* Initialize cassette interface */ - switch(m_io_lx_385->read() & 0x07) - { - case 0x01: - m_cass_data.speed = TAPE_300BPS; - m_cass_data.wave_filter = LX385_TAPE_SAMPLE_FREQ / 1600; - m_cass_data.wave_short = LX385_TAPE_SAMPLE_FREQ / (2400 * 2); - m_cass_data.wave_long = LX385_TAPE_SAMPLE_FREQ / (1200 * 2); - break; - case 0x02: - m_cass_data.speed = TAPE_600BPS; - m_cass_data.wave_filter = LX385_TAPE_SAMPLE_FREQ / 3200; - m_cass_data.wave_short = LX385_TAPE_SAMPLE_FREQ / (4800 * 2); - m_cass_data.wave_long = LX385_TAPE_SAMPLE_FREQ / (2400 * 2); - break; - case 0x04: - m_cass_data.speed = TAPE_1200BPS; - m_cass_data.wave_filter = LX385_TAPE_SAMPLE_FREQ / 6400; - m_cass_data.wave_short = LX385_TAPE_SAMPLE_FREQ / (9600 * 2); - m_cass_data.wave_long = LX385_TAPE_SAMPLE_FREQ / (4800 * 2); - } - m_cass_data.wave_length = m_cass_data.wave_short; - m_cass_data.output.length = m_cass_data.wave_length; - m_cass_data.output.level = 1; - m_cass_data.input.length = 0; - m_cass_data.input.bit = 1; - - m_uart->write_cs(0); - m_uart->write_nb1(1); - m_uart->write_nb2(1); - m_uart->write_tsb(1); - m_uart->write_eps(1); - m_uart->write_np(m_io_lx_385->read() & 0x80 ? 1 : 0); - m_uart->write_cs(1); - m_uart_clock->set_unscaled_clock(m_cass_data.speed * 16); - - lx385_ctrl_w(0); -} - -void z80ne_state::machine_reset() -{ - base_reset(); - - address_space &program = m_maincpu->space(AS_PROGRAM); - program.install_rom(0x0000, 0x03ff, m_rom); // do it here for F3 - m_rom_shadow_tap = program.install_read_tap(0x8000, 0x83ff, "rom_shadow_r",[this](offs_t offset, u8 &data, u8 mem_mask) - { - if (!machine().side_effects_disabled()) - { - // delete this tap - m_rom_shadow_tap->remove(); - - // reinstall ram over the rom shadow - m_maincpu->space(AS_PROGRAM).install_ram(0x0000, 0x03ff, m_mram); - } - - // return the original data - return data; - }); -} - -void z80net_state::machine_reset() -{ - reset_lx387(); - z80ne_state::machine_reset(); -} - -void z80netb_state::machine_reset() -{ - base_reset(); - reset_lx387(); -} - -void z80netf_state::machine_reset() -{ - reset_lx390_banking(); - base_reset(); - reset_lx387(); - - // basic roms are exempt from memory tap - if ((m_io_config->read() & 0x07) != 2) - { - address_space &program = m_maincpu->space(AS_PROGRAM); - m_rom_shadow_tap = program.install_read_tap(0x8000, 0xf3ff, "rom_shadow_r",[this](offs_t offset, u8 &data, u8 mem_mask) - { - if (!machine().side_effects_disabled()) - { - // delete this tap - m_rom_shadow_tap->remove(); - - // reinstall ram over the rom shadow - m_bank1->set_entry(0); - } - - // return the original data - return data; - }); - } -} - -INPUT_CHANGED_MEMBER(z80ne_state::z80ne_reset) -{ - uint8_t rst = m_io_rst->read(); - - if ( ! BIT(rst, 0)) - machine().schedule_soft_reset(); -} - -INPUT_CHANGED_MEMBER(z80net_state::z80net_nmi) -{ - uint8_t nmi = m_io_lx387_brk->read(); - - if ( ! BIT(nmi, 0)) - m_maincpu->pulse_input_line(INPUT_LINE_NMI, attotime::zero); -} - -void z80ne_state::machine_start() -{ - m_timer_nmi = timer_alloc(0); - - m_lx383_digits.resolve(); - - m_lx385_ctrl = 0x1f; - m_cassette_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(z80ne_state::z80ne_cassette_tc), this)); - m_kbd_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(z80ne_state::z80ne_kbd_scan), this)); - m_kbd_timer->adjust(attotime::from_hz(1000), 0, attotime::from_hz(1000)); -} - -void z80netf_state::machine_start() -{ - z80ne_state::machine_start(); - m_drv_led.resolve(); -} - -/****************************************************************************** - Drivers -******************************************************************************/ - -/* LX.383 - LX.384 HEX keyboard and display */ -uint8_t z80ne_state::lx383_r() -{ - /* - * Keyboard scanning - * - * IC14 NE555 astable oscillator - * IC13 74LS93 binary counter - * IC5 74LS240 tri-state buffer - * - * l'oscillatore NE555 alimenta il clock del contatore 74LS93 - * D0 - Q(A) --\ - * D1 - Q(B) |-- column - * D2 - Q(C) --/ - * D3 - Q(D) row - * D4 - CTRL - * D5 - 0 - * D6 - 0 - * D7 - ~KEY Pressed - */ - return m_lx383_key[m_lx383_scan_counter]; -} - -void z80ne_state::lx383_w(offs_t offset, uint8_t data) -{ - /* - * First 8 locations (F0-F7) are mapped to a dual-port 8-byte RAM - * The 1KHz NE-555 astable oscillator circuit drive - * a 4-bit 74LS93 binary counter. - * The 3 least significant bits of the counter are connected - * both to the read address of the dual-port ram and to - * a 74LS156 3 to 8 binary decoder driving the cathode - * of 8 7-segments LEDS. - * The data output of the dual-port ram drive the anodes - * of the LEDS through 74LS07 buffers. - * LED segments - dual-port RAM bit: - * A 0x01 - * B 0x02 - * C 0x04 - * D 0x08 - * E 0x10 - * F 0x20 - * G 0x40 - * P 0x80 (represented by DP in original schematics) - * - * A write in the range F0-FF starts a 74LS90 counter - * that trigger the NMI line of the CPU after 2 instruction - * fetch cycles for single step execution. - */ - - if ( offset < 8 ) - m_lx383_digits[offset] = data ^ 0xff; - else - { - // after writing to port 0xF8 and the first ~M1 cycles strike a NMI for single step execution - m_timer_nmi->adjust(m_maincpu->cycles_to_attotime(1)); - } -} - - -/* LX.385 Cassette tape interface */ -/* - * NE555 is connected to a 74LS93 binary counter - * 74LS93 output: - * QA-QC: column index for LEDs and keyboard - * QD: keyboard row select - * - * Port EE: UART Data Read/Write - * Port EF: Status/Control - * read, UART status bits read - * 0 OR Overrun - * 1 FE Framing Error - * 2 PE Parity Error - * 3 TBMT Transmitter Buffer Empty - * 4 DAV Data Available - * 5 EOC End Of Character - * 6 1 - * 7 1 - * write, UART control bits / Tape Unit select / Modulation control - * 0 bit1=0, bit0=0 UART Reset pulse - * 1 bit1=0, bit0=1 UART RDAV (Reset Data Available) pulse - * 2 Tape modulation enable - * 3 *TAPEA Enable (active low) (at reset: low) - * 4 *TAPEB Enable (active low) (at reset: low) - * Cassette is connected to the uart data input and output via the cassette - * interface hardware. - * - * The cassette interface hardware converts square-wave pulses into bits which the uart receives. - * - * 1. the cassette format: "frequency shift" is converted - into the uart data format "non-return to zero" - - 2. on cassette a 1 data bit is stored as 8 2400 Hz pulses - and a 0 data bit as 4 1200 Hz pulses - - At 1200 baud, a logic 1 is 1 cycle of 1200 Hz and a logic 0 is 1/2 cycle of 600 Hz. - - At 300 baud, a logic 1 is 8 cycles of 2400 Hz and a logic 0 is 4 cycles of 1200 Hz. - - Attenuation is applied to the signal and the square wave edges are rounded. - - A manchester encoder is used. A flip-flop synchronises input - data on the positive-edge of the clock pulse. - - The UART is a RCA CDP1854 CMOS device with pin 2 jumpered to GND to select the - AY-3-1015 compatibility mode. The jumper at P4 can be switched to place 12 V on - pin 2 for an old PMOS UART. - * - */ -uint8_t z80ne_state::lx385_ctrl_r() -{ - /* set unused bits high */ - uint8_t data = 0xc0; - - m_uart->write_swe(0); - data |= (m_uart->or_r( ) ? 0x01 : 0); - data |= (m_uart->fe_r( ) ? 0x02 : 0); - data |= (m_uart->pe_r( ) ? 0x04 : 0); - data |= (m_uart->tbmt_r() ? 0x08 : 0); - data |= (m_uart->dav_r( ) ? 0x10 : 0); - data |= (m_uart->eoc_r( ) ? 0x20 : 0); - m_uart->write_swe(1); - - return data; -} - -#define LX385_CASSETTE_MOTOR_MASK ((1<<3)|(1<<4)) - -void z80ne_state::lx385_ctrl_w(uint8_t data) -{ - /* Translate data to control signals - * 0 bit1=0, bit0=0 UART Reset pulse - * 1 bit1=0, bit0=1 UART RDAV (Reset Data Available) pulse - * 2 UART Tx Clock Enable (active high) - * 3 *TAPEA Enable (active low) (at reset: low) - * 4 *TAPEB Enable (active low) (at reset: low) - */ - uint8_t uart_reset, uart_rdav; - uint8_t motor_a, motor_b; - uint8_t changed_bits = (m_lx385_ctrl ^ data) & 0x1C; - m_lx385_ctrl = data; - - uart_reset = ((data & 0x03) == 0x00); - uart_rdav = ((data & 0x03) == 0x01); - motor_a = ((data & 0x08) == 0x00); - motor_b = ((data & 0x10) == 0x00); - - /* UART Reset and RDAV */ - if (uart_reset) - { - m_uart->write_xr(1); - m_uart->write_xr(0); - } - - if (uart_rdav) - { - m_uart->write_rdav(1); - m_uart->write_rdav(0); - } - - if (!changed_bits) return; - - /* motors */ - if(changed_bits & 0x18) - { - m_cassette1->change_state( - (motor_a) ? CASSETTE_MOTOR_ENABLED : CASSETTE_MOTOR_DISABLED,CASSETTE_MASK_MOTOR); - - m_cassette2->change_state( - (motor_b) ? CASSETTE_MOTOR_ENABLED : CASSETTE_MOTOR_DISABLED,CASSETTE_MASK_MOTOR); - - if (motor_a || motor_b) - m_cassette_timer->adjust(attotime::zero, 0, attotime::from_hz(LX385_TAPE_SAMPLE_FREQ)); - else - m_cassette_timer->adjust(attotime::zero); - } -} - -WRITE_LINE_MEMBER(z80ne_state::lx385_uart_tx_clock_w) -{ - if (BIT(m_lx385_ctrl, 2)) - m_uart->write_tcp(state); -} - -READ_LINE_MEMBER(z80net_state::lx387_shift_r) -{ - return BIT(m_io_modifiers->read(), 0) || BIT(m_io_modifiers->read(), 2); -} - -READ_LINE_MEMBER(z80net_state::lx387_control_r) -{ - return BIT(m_io_modifiers->read(), 1); -} - -uint8_t z80net_state::lx388_mc6847_videoram_r(offs_t offset) -{ - if (offset == ~0) return 0xff; - - int d6 = BIT(m_videoram[offset], 6); - int d7 = BIT(m_videoram[offset], 7); - - m_vdg->inv_w(d6 && d7); - m_vdg->as_w(!d6 && d7); - m_vdg->intext_w(!d6 && d7); - - return m_videoram[offset]; -} - -uint8_t z80net_state::lx387_data_r() -{ - uint8_t data = m_lx387_kr2376->data_r() & 0x7f; - data |= m_lx387_kr2376->get_output_pin(kr2376_device::KR2376_SO) << 7; - return data; -} - -uint8_t z80net_state::lx388_read_field_sync() -{ - return m_vdg->fs_r() << 7; -} - -/* - * DRQ INTRQ IC9B.10 IC8B.*Q - * 0 0 1 0 - * 0 1 0 x - * 1 0 0 x - * 1 1 0 x - * - */ - -void z80netf_state::lx390_motor_w(uint8_t data) -{ - /* Selection of drive and parameters - A write also causes the selected drive motor to turn on for about 3 seconds. - When the motor turns off, the drive is deselected. - d7 Unused (trs80: 1=MFM, 0=FM) - d6 (trs80: 1=Wait) - d5 0=Side 0, 1=Side 1 (trs80: 1=Write Precompensation enabled) - d4 Unused (trs80: 0=Side 0, 1=Side 1) - d3 1=select drive 3 - d2 1=select drive 2 - d1 1=select drive 1 - d0 1=select drive 0 */ - - floppy_image_device *floppy = nullptr; - - for (u8 f = 0; f < 4; f++) - if (BIT(data, f)) - floppy = m_floppy[f]->get_device(); - - m_wd1771->set_floppy(floppy); - - if (floppy) - { - floppy->ss_w(BIT(data, 5)); - floppy->mon_w(0); - } - - m_wd17xx_state.head = (data & 32) ? 1 : 0; - m_wd17xx_state.drive = data & 0x0F; - - /* no drive selected, turn off all leds */ - if (!m_wd17xx_state.drive) - { - m_drv_led[0] = 0; - m_drv_led[1] = 0; - } -} - -uint8_t z80netf_state::lx390_fdc_r(offs_t offset) -{ - uint8_t d; - - switch(offset) - { - case 0: - d = m_wd1771->status_r() ^ 0xff; - LOG("lx390_fdc_r, WD17xx status: %02x\n", d); - break; - case 1: - d = m_wd1771->track_r() ^ 0xff; - LOG("lx390_fdc_r, WD17xx track: %02x\n", d); - break; - case 2: - d = m_wd1771->sector_r() ^ 0xff; - LOG("lx390_fdc_r, WD17xx sector: %02x\n", d); - break; - case 3: - d = m_wd1771->data_r() ^ 0xff; - LOG("lx390_fdc_r, WD17xx data3: %02x\n", d); - break; - case 6: - d = 0xff; - m_bank1->set_entry(0); - break; - case 7: - d = m_wd1771->data_r() ^ 0xff; - LOG("lx390_fdc_r, WD17xx data7, force: %02x\n", d); - break; - default: - d = 0x00; - } - return d; -} - -void z80netf_state::lx390_fdc_w(offs_t offset, uint8_t data) -{ - uint8_t d = data; - switch(offset) - { - case 0: - LOG("lx390_fdc_w, WD17xx command: %02x\n", d); - m_wd1771->cmd_w(d ^ 0xff); - if (m_wd17xx_state.drive & 1) - m_drv_led[0] = 2; - else if (m_wd17xx_state.drive & 2) - m_drv_led[1] = 2; - break; - case 1: - LOG("lx390_fdc_w, WD17xx track: %02x\n", d); - m_wd1771->track_w(d ^ 0xff); - break; - case 2: - LOG("lx390_fdc_w, WD17xx sector: %02x\n", d); - m_wd1771->sector_w(d ^ 0xff); - break; - case 3: - m_wd1771->data_w(d ^ 0xff); - LOG("lx390_fdc_w, WD17xx data3: %02x\n", d); - break; - case 6: - LOG("lx390_fdc_w, motor_w: %02x\n", d); - lx390_motor_w(d); - break; - case 7: - LOG("lx390_fdc_w, WD17xx data7, force: %02x\n", d); - m_wd1771->data_w(d ^ 0xff); - break; - } -} |