// license:GPL-2.0+
// copyright-holders:Kevin Thacker, Robbbert
/******************************************************************************
Exidy Sorcerer machine functions
*******************************************************************************/
#include "emu.h"
#include "includes/sorcerer.h"
#include "machine/z80bin.h"
/* 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 (BIT(m_fe, 7))
{
/* connect to rs232 */
m_rs232->write_txd(m_uart->so_r());
m_uart->write_si(m_rs232->rxd_r());
}
}
void sorcerer_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
switch (id)
{
case TIMER_SERIAL:
sorcerer_serial_tc(ptr, param);
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_t 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->write_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->so_r();
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->write_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->so_r();
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_fd_w)
{
/* Translate data to control signals */
m_uart->write_cs(0);
m_uart->write_nb1(BIT(data, 0));
m_uart->write_nb2(BIT(data, 1));
m_uart->write_tsb(BIT(data, 2));
m_uart->write_eps(BIT(data, 3));
m_uart->write_np(BIT(data, 4));
m_uart->write_cs(1);
}
WRITE8_MEMBER(sorcerer_state::sorcerer_fe_w)
{
uint8_t 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
{
m_serial_timer->adjust(attotime::zero);
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(ES_UART_CLOCK*4));
else
m_cassette_timer->adjust(attotime::zero);
}
else
{
m_serial_timer->adjust(attotime::zero, 0, attotime::from_hz(ES_UART_CLOCK*4));
m_cassette_timer->adjust(attotime::zero);
}
// bit 6 baud rate */
if (BIT(changed_bits, 6))
{
m_uart->set_receiver_clock(BIT(data, 6) ? ES_UART_CLOCK*4 : ES_UART_CLOCK);
m_uart->set_transmitter_clock(BIT(data, 6) ? ES_UART_CLOCK*4 : ES_UART_CLOCK);
}
}
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_fd_r)
{
/* set unused bits high */
uint8_t data = 0xe0;
m_uart->write_swe(0);
data |= m_uart->tbmt_r() ? 0x01 : 0;
data |= m_uart->dav_r( ) ? 0x02 : 0;
data |= m_uart->or_r( ) ? 0x04 : 0;
data |= m_uart->fe_r( ) ? 0x08 : 0;
data |= m_uart->pe_r( ) ? 0x10 : 0;
m_uart->write_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_t 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_t *RAM = memregion(m_maincpu->tag())->base();
address_space &space = m_maincpu->space(AS_PROGRAM);
uint8_t 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_result::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_result::PASS;
}
void sorcerer_state::machine_start()
{
m_cassette_timer = timer_alloc(TIMER_CASSETTE);
m_serial_timer = timer_alloc(TIMER_SERIAL);
uint16_t 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);
m_serial_timer = timer_alloc(TIMER_SERIAL);
uint16_t 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_t 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_result::PASS)
return image_init_result::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_result::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)) && (space.read_byte(0xdffa) == 0xc3))
{
uint8_t i;
static const uint8_t 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_result::PASS;
}