diff options
Diffstat (limited to 'src/mame/machine/sorcerer.c')
-rw-r--r-- | src/mame/machine/sorcerer.c | 492 |
1 files changed, 492 insertions, 0 deletions
diff --git a/src/mame/machine/sorcerer.c b/src/mame/machine/sorcerer.c new file mode 100644 index 00000000000..25fb66015e3 --- /dev/null +++ b/src/mame/machine/sorcerer.c @@ -0,0 +1,492 @@ +// license:GPL-2.0+ +// copyright-holders:Kevin Thacker, Robbbert +/****************************************************************************** + + Exidy Sorcerer machine functions + +*******************************************************************************/ + +#include "includes/sorcerer.h" +#include "machine/z80bin.h" + +#if SORCERER_USING_RS232 + +/* The serial code (which was never connected to the outside) is disabled for now. */ + +/* timer for sorcerer serial chip transmit and receive */ + +TIMER_CALLBACK_MEMBER(sorcerer_state::sorcerer_serial_tc) +{ + /* if rs232 is enabled, uart is connected to clock defined by bit6 of port fe. + Transmit and receive clocks are connected to the same clock */ + + /* if rs232 is disabled, receive clock is linked to cassette hardware */ + if (m_fe & 0x80) + { + /* connect to rs232 */ + } +} +#endif + + +void sorcerer_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) +{ + switch (id) + { + case TIMER_SERIAL: +#if SORCERER_USING_RS232 + sorcerer_serial_tc(ptr, param); +#endif + break; + case TIMER_CASSETTE: + sorcerer_cassette_tc(ptr, param); + break; + case TIMER_RESET: + sorcerer_reset(ptr, param); + break; + default: + assert_always(FALSE, "Unknown id in sorcerer_state::device_timer"); + } +} + + +/* timer to read cassette waveforms */ + +TIMER_CALLBACK_MEMBER(sorcerer_state::sorcerer_cassette_tc) +{ + UINT8 cass_ws = 0; + switch (m_fe & 0xc0) /*/ bit 7 low indicates cassette */ + { + case 0x00: /* Cassette 300 baud */ + + /* loading a tape - this is basically the same as the super80. + We convert the 1200/2400 Hz signal to a 0 or 1, and send it to the uart. */ + + m_cass_data.input.length++; + + cass_ws = ((((m_fe & 0x20) ? m_cassette2 : m_cassette1))->input() > +0.02) ? 1 : 0; + + if (cass_ws != m_cass_data.input.level) + { + m_cass_data.input.level = cass_ws; + m_cass_data.input.bit = ((m_cass_data.input.length < 0x6) || (m_cass_data.input.length > 0x20)) ? 1 : 0; + m_cass_data.input.length = 0; + m_uart->set_input_pin(AY31015_SI, m_cass_data.input.bit); + } + + /* saving a tape - convert the serial stream from the uart, into 1200 and 2400 Hz frequencies. + Synchronisation of the frequency pulses to the uart is extremely important. */ + + m_cass_data.output.length++; + if (!(m_cass_data.output.length & 0x1f)) + { + cass_ws = m_uart->get_output_pin(AY31015_SO); + if (cass_ws != m_cass_data.output.bit) + { + m_cass_data.output.bit = cass_ws; + m_cass_data.output.length = 0; + } + } + + if (!(m_cass_data.output.length & 3)) + { + if (!((m_cass_data.output.bit == 0) && (m_cass_data.output.length & 4))) + { + m_cass_data.output.level ^= 1; // toggle output this, except on 2nd half of low bit + ((m_fe & 0x20) ? m_cassette2 : m_cassette1)->output(m_cass_data.output.level ? -1.0 : +1.0); + } + } + return; + + case 0x40: /* Cassette 1200 baud */ + /* loading a tape */ + m_cass_data.input.length++; + + cass_ws = ((((m_fe & 0x20) ? m_cassette2 : m_cassette1))->input() > +0.02) ? 1 : 0; + + if (cass_ws != m_cass_data.input.level || m_cass_data.input.length == 10) + { + m_cass_data.input.bit = ((m_cass_data.input.length < 10) || (m_cass_data.input.length > 0x20)) ? 1 : 0; + if ( cass_ws != m_cass_data.input.level ) + { + m_cass_data.input.length = 0; + m_cass_data.input.level = cass_ws; + } + m_uart->set_input_pin(AY31015_SI, m_cass_data.input.bit); + } + + /* saving a tape - convert the serial stream from the uart, into 600 and 1200 Hz frequencies. */ + + m_cass_data.output.length++; + if (!(m_cass_data.output.length & 7)) + { + cass_ws = m_uart->get_output_pin(AY31015_SO); + if (cass_ws != m_cass_data.output.bit) + { + m_cass_data.output.bit = cass_ws; + m_cass_data.output.length = 0; + } + } + + if (!(m_cass_data.output.length & 7)) + { + if (!((m_cass_data.output.bit == 0) && (m_cass_data.output.length & 8))) + { + m_cass_data.output.level ^= 1; // toggle output this, except on 2nd half of low bit + ((m_fe & 0x20) ? m_cassette2 : m_cassette1)->output(m_cass_data.output.level ? -1.0 : +1.0); + } + } + return; + } +} + + +/* after the first 4 bytes have been read from ROM, switch the ram back in */ +TIMER_CALLBACK_MEMBER(sorcerer_state::sorcerer_reset) +{ + membank("boot")->set_entry(0); +} + +WRITE8_MEMBER(sorcerer_state::sorcerer_fc_w) +{ + m_uart->set_transmit_data(data); +} + + +WRITE8_MEMBER(sorcerer_state::sorcerer_fd_w) +{ + /* Translate data to control signals */ + + m_uart->set_input_pin(AY31015_CS, 0); + m_uart->set_input_pin(AY31015_NB1, BIT(data, 0)); + m_uart->set_input_pin(AY31015_NB2, BIT(data, 1)); + m_uart->set_input_pin(AY31015_TSB, BIT(data, 2)); + m_uart->set_input_pin(AY31015_EPS, BIT(data, 3)); + m_uart->set_input_pin(AY31015_NP, BIT(data, 4)); + m_uart->set_input_pin(AY31015_CS, 1); +} + +WRITE8_MEMBER(sorcerer_state::sorcerer_fe_w) +{ + UINT8 changed_bits = (m_fe ^ data) & 0xf0; + m_fe = data; + + /* bits 0..3 */ + m_keyboard_line = data & 0x0f; + + if (!changed_bits) return; + + /* bits 4..5 */ + /* does user want to hear the sound? */ + + if (!BIT(data, 7)) // cassette operations + { +#if SORCERER_USING_RS232 + m_serial_timer->adjust(attotime::zero); +#endif + + bool sound = BIT(m_iop_config->read(), 3); + + m_cassette1->change_state( + (BIT(data,4) & sound) ? CASSETTE_SPEAKER_ENABLED : CASSETTE_SPEAKER_MUTED, CASSETTE_MASK_SPEAKER); + + m_cassette2->change_state( + (BIT(data,5) & sound) ? CASSETTE_SPEAKER_ENABLED : CASSETTE_SPEAKER_MUTED, CASSETTE_MASK_SPEAKER); + + /* cassette 1 motor */ + m_cassette1->change_state( + (BIT(data,4)) ? CASSETTE_MOTOR_ENABLED : CASSETTE_MOTOR_DISABLED, CASSETTE_MASK_MOTOR); + + /* cassette 2 motor */ + m_cassette2->change_state( + (BIT(data,5)) ? CASSETTE_MOTOR_ENABLED : CASSETTE_MOTOR_DISABLED, CASSETTE_MASK_MOTOR); + + if (data & 0x30) + m_cassette_timer->adjust(attotime::zero, 0, attotime::from_hz(19200)); + else + m_cassette_timer->adjust(attotime::zero); + } +#if SORCERER_USING_RS232 + else + { + m_serial_timer->adjust(attotime::zero, 0, attotime::from_hz(19200)); + m_cassette_timer->adjust(attotime::zero); + } +#endif + + // bit 6 baud rate */ + if (BIT(changed_bits, 6)) + { + m_uart->set_receiver_clock(BIT(data, 6) ? 19200.0 : 4800.0); + m_uart->set_transmitter_clock(BIT(data, 6) ? 19200.0 : 4800.0); + } +} + +WRITE8_MEMBER(sorcerer_state::sorcerer_ff_w) +{ + /// TODO: create a sorcerer parallel slot with a 7 bit and 8 bit centronics adapter as two of the options + /// TODO: figure out what role FE plays http://www.trailingedge.com/exidy/exidych7.html + m_centronics->write_data0(BIT(data, 0)); + m_centronics->write_data1(BIT(data, 1)); + m_centronics->write_data2(BIT(data, 2)); + m_centronics->write_data3(BIT(data, 3)); + m_centronics->write_data4(BIT(data, 4)); + m_centronics->write_data5(BIT(data, 5)); + m_centronics->write_data6(BIT(data, 6)); + + /* reading the config switch */ + switch (m_iop_config->read() & 0x02) + { + case 0: /* 7-bit port */ + /* bit 7 = strobe, bit 6..0 = data */ + m_centronics->write_data7(0); + m_centronics->write_strobe(BIT(data, 7)); + break; + + case 2: /* 8-bit port */ + /* hardware strobe driven from port select, bit 7..0 = data */ + m_centronics->write_data7(BIT(data, 7)); + m_centronics->write_strobe(0); + m_centronics->write_strobe(1); + break; + } +} + +READ8_MEMBER(sorcerer_state::sorcerer_fc_r) +{ + UINT8 data = m_uart->get_received_data(); + m_uart->set_input_pin(AY31015_RDAV, 0); + m_uart->set_input_pin(AY31015_RDAV, 1); + return data; +} + +READ8_MEMBER(sorcerer_state::sorcerer_fd_r) +{ + /* set unused bits high */ + UINT8 data = 0xe0; + + m_uart->set_input_pin(AY31015_SWE, 0); + data |= m_uart->get_output_pin(AY31015_TBMT) ? 0x01 : 0; + data |= m_uart->get_output_pin(AY31015_DAV ) ? 0x02 : 0; + data |= m_uart->get_output_pin(AY31015_OR ) ? 0x04 : 0; + data |= m_uart->get_output_pin(AY31015_FE ) ? 0x08 : 0; + data |= m_uart->get_output_pin(AY31015_PE ) ? 0x10 : 0; + m_uart->set_input_pin(AY31015_SWE, 1); + + return data; +} + +READ8_MEMBER(sorcerer_state::sorcerer_fe_r) +{ + /* bits 6..7 + - hardware handshakes from user port + - not emulated + - tied high, allowing PARIN and PAROUT bios routines to run */ + + UINT8 data = 0xc0; + + /* bit 5 - vsync */ + data |= m_iop_vs->read(); + + /* bits 4..0 - keyboard data */ + data |= m_iop_x[m_keyboard_line]->read(); + + return data; +} + +/****************************************************************************** + Snapshot Handling +******************************************************************************/ + +SNAPSHOT_LOAD_MEMBER( sorcerer_state,sorcerer) +{ + UINT8 *RAM = memregion(m_maincpu->tag())->base(); + address_space &space = m_maincpu->space(AS_PROGRAM); + UINT8 header[28]; + unsigned char s_byte; + + /* check size */ + if (snapshot_size != 0x1001c) + { + image.seterror(IMAGE_ERROR_INVALIDIMAGE, "Snapshot must be 65564 bytes"); + image.message("Snapshot must be 65564 bytes"); + return IMAGE_INIT_FAIL; + } + + /* get the header */ + image.fread( &header, sizeof(header)); + + /* write it to ram */ + for (int i = 0; i < 0xc000; i++) + { + image.fread( &s_byte, 1); + space.write_byte(i, s_byte); + } + image.fread( RAM+0xc000, 0x4000); + + /* patch CPU registers */ + m_maincpu->set_state_int(Z80_I, header[0]); + m_maincpu->set_state_int(Z80_HL2, header[1] | (header[2] << 8)); + m_maincpu->set_state_int(Z80_DE2, header[3] | (header[4] << 8)); + m_maincpu->set_state_int(Z80_BC2, header[5] | (header[6] << 8)); + m_maincpu->set_state_int(Z80_AF2, header[7] | (header[8] << 8)); + m_maincpu->set_state_int(Z80_HL, header[9] | (header[10] << 8)); + m_maincpu->set_state_int(Z80_DE, header[11] | (header[12] << 8)); + m_maincpu->set_state_int(Z80_BC, header[13] | (header[14] << 8)); + m_maincpu->set_state_int(Z80_IY, header[15] | (header[16] << 8)); + m_maincpu->set_state_int(Z80_IX, header[17] | (header[18] << 8)); + m_maincpu->set_state_int(Z80_IFF1, header[19]&2 ? 1 : 0); + m_maincpu->set_state_int(Z80_IFF2, header[19]&4 ? 1 : 0); + m_maincpu->set_state_int(Z80_R, header[20]); + m_maincpu->set_state_int(Z80_AF, header[21] | (header[22] << 8)); + m_maincpu->set_state_int(STATE_GENSP, header[23] | (header[24] << 8)); + m_maincpu->set_state_int(Z80_IM, header[25]); + m_maincpu->set_pc(header[26] | (header[27] << 8)); + + return IMAGE_INIT_PASS; +} + +void sorcerer_state::machine_start() +{ + m_cassette_timer = timer_alloc(TIMER_CASSETTE); +#if SORCERER_USING_RS232 + m_serial_timer = timer_alloc(TIMER_SERIAL); +#endif + + UINT16 endmem = 0xbfff; + + address_space &space = m_maincpu->space(AS_PROGRAM); + /* configure RAM */ + switch (m_ram->size()) + { + case 8*1024: + space.unmap_readwrite(0x2000, endmem); + break; + + case 16*1024: + space.unmap_readwrite(0x4000, endmem); + break; + + case 32*1024: + space.unmap_readwrite(0x8000, endmem); + break; + } + + if (m_cart->exists()) + space.install_read_handler(0xc000, 0xdfff, read8_delegate(FUNC(generic_slot_device::read_rom),(generic_slot_device*)m_cart)); +} + +MACHINE_START_MEMBER(sorcerer_state,sorcererd) +{ + m_cassette_timer = timer_alloc(TIMER_CASSETTE); +#if SORCERER_USING_RS232 + m_serial_timer = timer_alloc(TIMER_SERIAL); +#endif + + UINT16 endmem = 0xbbff; + + address_space &space = m_maincpu->space(AS_PROGRAM); + /* configure RAM */ + switch (m_ram->size()) + { + case 8*1024: + space.unmap_readwrite(0x2000, endmem); + break; + + case 16*1024: + space.unmap_readwrite(0x4000, endmem); + break; + + case 32*1024: + space.unmap_readwrite(0x8000, endmem); + break; + } + + if (m_cart->exists()) + space.install_read_handler(0xc000, 0xdfff, read8_delegate(FUNC(generic_slot_device::read_rom),(generic_slot_device*)m_cart)); +} + +void sorcerer_state::machine_reset() +{ + address_space &space = m_maincpu->space(AS_PROGRAM); + + /* Initialize cassette interface */ + m_cass_data.output.length = 0; + m_cass_data.output.level = 1; + m_cass_data.input.length = 0; + m_cass_data.input.bit = 1; + + m_fe = 0xff; + sorcerer_fe_w(space, 0, 0, 0xff); + + membank("boot")->set_entry(1); + timer_set(attotime::from_usec(10), TIMER_RESET); +} + + +/*------------------------------------------------- + QUICKLOAD_LOAD_MEMBER( sorcerer_state, sorcerer ) +-------------------------------------------------*/ + +QUICKLOAD_LOAD_MEMBER( sorcerer_state, sorcerer ) +{ + UINT16 execute_address, start_address, end_address; + int autorun; + address_space &space = m_maincpu->space(AS_PROGRAM); + + /* load the binary into memory */ + if (z80bin_load_file(&image, space, file_type, &execute_address, &start_address, &end_address) == IMAGE_INIT_FAIL) + return IMAGE_INIT_FAIL; + + /* is this file executable? */ + if (execute_address != 0xffff) + { + /* check to see if autorun is on (I hate how this works) */ + autorun = m_iop_config->read() & 1; + + if ((execute_address >= 0xc000) && (execute_address <= 0xdfff) && (space.read_byte(0xdffa) != 0xc3)) + return IMAGE_INIT_FAIL; /* can't run a program if the cartridge isn't in */ + + /* Since Exidy Basic is by Microsoft, it needs some preprocessing before it can be run. + 1. A start address of 01D5 indicates a basic program which needs its pointers fixed up. + 2. If autorunning, jump to C689 (command processor), else jump to C3DD (READY prompt). + Important addresses: + 01D5 = start (load) address of a conventional basic program + C858 = an autorun basic program will have this exec address on the tape + C3DD = part of basic that displays READY and lets user enter input */ + + if ((start_address == 0x1d5) || (execute_address == 0xc858)) + { + UINT8 i; + static const UINT8 data[]={ + 0xcd, 0x26, 0xc4, // CALL C426 ;set up other pointers + 0x21, 0xd4, 1, // LD HL,01D4 ;start of program address (used by C689) + 0x36, 0, // LD (HL),00 ;make sure dummy end-of-line is there + 0xc3, 0x89, 0xc6 // JP C689 ;run program + }; + + for (i = 0; i < ARRAY_LENGTH(data); i++) + space.write_byte(0xf01f + i, data[i]); + + if (!autorun) + space.write_word(0xf028,0xc3dd); + + /* tell BASIC where program ends */ + space.write_byte(0x1b7, end_address & 0xff); + space.write_byte(0x1b8, (end_address >> 8) & 0xff); + + if ((execute_address != 0xc858) && autorun) + space.write_word(0xf028, execute_address); + + m_maincpu->set_pc(0xf01f); + } + else + { + if (autorun) + m_maincpu->set_pc(execute_address); + } + + } + + return IMAGE_INIT_PASS; +} |