// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
Bally/Sente SAC-1 system
driver by Aaron Giles
***************************************************************************/
#include "emu.h"
#include "cpu/m6809/m6809.h"
#include "includes/balsente.h"
/*************************************
*
* Interrupt handling
*
*************************************/
TIMER_CALLBACK_MEMBER(balsente_state::irq_off)
{
m_maincpu->set_input_line(M6809_IRQ_LINE, CLEAR_LINE);
}
TIMER_DEVICE_CALLBACK_MEMBER(balsente_state::interrupt_timer)
{
/* next interrupt after scanline 256 is scanline 64 */
if (param == 256)
m_scanline_timer->adjust(m_screen->time_until_pos(64), 64);
else
m_scanline_timer->adjust(m_screen->time_until_pos(param + 64), param + 64);
/* IRQ starts on scanline 0, 64, 128, etc. */
m_maincpu->set_input_line(M6809_IRQ_LINE, ASSERT_LINE);
/* it will turn off on the next HBLANK */
machine().scheduler().timer_set(m_screen->time_until_pos(param, BALSENTE_HBSTART), timer_expired_delegate(FUNC(balsente_state::irq_off),this));
/* if this is Grudge Match, update the steering */
if (m_grudge_steering_result & 0x80)
update_grudge_steering();
/* if we're a shooter, we do a little more work */
if (m_shooter)
{
uint8_t tempx, tempy;
/* we latch the beam values on the first interrupt after VBLANK */
if (param == 64)
{
m_shooter_x = ioport("FAKEX")->read();
m_shooter_y = ioport("FAKEY")->read();
}
/* which bits get returned depends on which scanline we're at */
tempx = m_shooter_x << ((param - 64) / 64);
tempy = m_shooter_y << ((param - 64) / 64);
m_nstocker_bits = ((tempx >> 4) & 0x08) | ((tempx >> 1) & 0x04) |
((tempy >> 6) & 0x02) | ((tempy >> 3) & 0x01);
}
}
void balsente_state::machine_start()
{
if (m_acia.found())
{
m_acia->write_cts(0);
m_acia->write_dcd(0);
}
save_item(NAME(m_nstocker_bits));
save_item(NAME(m_spiker_expand_color));
save_item(NAME(m_spiker_expand_bgcolor));
save_item(NAME(m_spiker_expand_bits));
save_item(NAME(m_grudge_steering_result));
save_item(NAME(m_grudge_last_steering));
}
void balsente_state::machine_reset()
{
/* create the polynomial tables */
poly17_init();
/* reset the ADC states */
m_adc_value = 0;
/* reset game-specific states */
m_grudge_steering_result = 0;
/* point the banks to bank 0 */
m_bankab->set_entry(0);
m_bankcd->set_entry(0);
m_bankef->set_entry(0);
m_maincpu->reset();
/* start a timer to generate interrupts */
m_scanline_timer->adjust(m_screen->time_until_pos(0));
}
/*************************************
*
* Hardware random numbers
*
* NOTE: this is stolen straight from
* POKEY.c
*
*************************************/
void balsente_state::poly17_init()
{
uint32_t i, x = 0;
uint8_t *r;
/* allocate memory */
r = m_rand17;
/* generate the polynomial */
for (i = 0; i < POLY17_SIZE; i++)
{
/* store new values */
*r++ = x >> 3;
/* calculate next bit */
x = ((x << POLY17_SHL) + (x >> POLY17_SHR) + POLY17_ADD) & POLY17_SIZE;
}
}
void balsente_state::random_reset_w(uint8_t data)
{
/* reset random number generator */
}
uint8_t balsente_state::random_num_r()
{
/* CPU runs at 1.25MHz, noise source at 100kHz --> multiply by 12.5 */
uint32_t cc = m_maincpu->total_cycles();
/* 12.5 = 8 + 4 + 0.5 */
cc = (cc << 3) + (cc << 2) + (cc >> 1);
return m_rand17[cc & POLY17_SIZE];
}
/*************************************
*
* ROM banking
*
*************************************/
void balsente_state::rombank_select_w(uint8_t data)
{
/* the bank number comes from bits 4-6 */
m_bankab->set_entry((data >> 4) & 7);
m_bankcd->set_entry((data >> 4) & 7);
m_bankef->set_entry(0);
}
void balsente_state::rombank2_select_w(uint8_t data)
{
/* Night Stocker and Name that Tune only so far.... */
int bank = data & 7;
/* top bit controls which half of the ROMs to use (Name that Tune only) */
if (memregion("maincpu")->bytes() > 0x20000) bank |= (data >> 4) & 8;
/* when they set the AB bank, it appears as though the CD bank is reset */
if (data & 0x20)
{
m_bankab->set_entry(bank);
m_bankcd->set_entry(6);
m_bankef->set_entry(0);
}
/* set both banks */
else
{
m_bankab->set_entry(bank);
m_bankcd->set_entry(bank);
m_bankef->set_entry(BIT(bank, 3));
}
}
/*************************************
*
* Special outputs
*
*************************************/
WRITE_LINE_MEMBER(balsente_state::out0_w)
{
// output().set_led_value(0, state);
}
WRITE_LINE_MEMBER(balsente_state::out1_w)
{
// output().set_led_value(1, state);
}
WRITE_LINE_MEMBER(balsente_state::out2_w)
{
// output().set_led_value(2, state);
}
WRITE_LINE_MEMBER(balsente_state::out3_w)
{
// output().set_led_value(3, state);
}
WRITE_LINE_MEMBER(balsente_state::out4_w)
{
// output().set_led_value(4, state);
}
WRITE_LINE_MEMBER(balsente_state::out5_w)
{
// output().set_led_value(5, state);
}
WRITE_LINE_MEMBER(balsente_state::out6_w)
{
// output().set_led_value(6, state);
}
WRITE_LINE_MEMBER(balsente_state::nvrecall_w)
{
m_novram[0]->recall(!state);
m_novram[1]->recall(!state);
}
uint8_t balsente_state::novram_8bit_r(address_space &space, offs_t offset)
{
return (m_novram[0]->read(space, offset) & 0x0f) | (m_novram[1]->read(space, offset) << 4);
}
void balsente_state::novram_8bit_w(offs_t offset, uint8_t data)
{
m_novram[0]->write(offset, data & 0x0f);
m_novram[1]->write(offset, data >> 4);
}
/*************************************
*
* ADC handlers
*
*************************************/
INTERRUPT_GEN_MEMBER(balsente_state::update_analog_inputs)
{
int i;
static const char *const analog[] = { "AN0", "AN1", "AN2", "AN3" };
/* the analog input system helpfully scales the value read by the percentage of time */
/* into the current frame we are; unfortunately, this is bad for us, since the analog */
/* ports are read once a frame, just at varying intervals. To get around this, we */
/* read all the analog inputs at VBLANK time and just return the cached values. */
for (i = 0; i < 4; i++)
m_analog_input_data[i] = ioport(analog[i])->read();
}
TIMER_CALLBACK_MEMBER(balsente_state::adc_finished)
{
int which = param;
/* analog controls are read in two pieces; the lower port returns the sign */
/* and the upper port returns the absolute value of the magnitude */
int val = m_analog_input_data[which / 2] << m_adc_shift;
/* special case for Stompin'/Shrike Avenger */
if (m_adc_shift == 32)
{
m_adc_value = m_analog_input_data[which];
return;
}
/* push everything out a little bit extra; most games seem to have a dead */
/* zone in the middle that feels unnatural with the mouse */
if (val < 0) val -= 8;
else if (val > 0) val += 8;
/* clip to 0xff maximum magnitude */
if (val < -0xff) val = -0xff;
else if (val > 0xff) val = 0xff;
/* return the sign */
if (!(which & 1))
m_adc_value = (val < 0) ? 0xff : 0x00;
/* return the magnitude */
else
m_adc_value = (val < 0) ? -val : val;
}
uint8_t balsente_state::adc_data_r()
{
/* just return the last value read */
return m_adc_value;
}
void balsente_state::adc_select_w(offs_t offset, uint8_t data)
{
/* set a timer to go off and read the value after 50us */
/* it's important that we do this for Mini Golf */
logerror("adc_select %d\n", offset & 7);
machine().scheduler().timer_set(attotime::from_usec(50), timer_expired_delegate(FUNC(balsente_state::adc_finished),this), offset & 7);
}
uint8_t balsente_state::teamht_extra_r()
{
return m_teamht_input;
}
void balsente_state::teamht_multiplex_select_w(offs_t offset, uint8_t data)
{
logerror("multiplex_select %d\n", offset & 7);
switch (offset & 7)
{
case 0x04: m_teamht_input = ioport("EX0")->read(); break;
case 0x05: m_teamht_input = ioport("EX1")->read(); break;
case 0x06: m_teamht_input = ioport("EX2")->read(); break;
case 0x07: m_teamht_input = ioport("EX3")->read(); break;
default:
logerror("(unhandled)\n");
break;
}
}
/*************************************
*
* Game-specific handlers
*
*************************************/
CUSTOM_INPUT_MEMBER(balsente_state::nstocker_bits_r)
{
return m_nstocker_bits;
}
void balsente_state::spiker_expand_w(offs_t offset, uint8_t data)
{
/* offset 0 is the bit pattern */
if (offset == 0)
m_spiker_expand_bits = data;
/* offset 1 is the background color (cleared on each read) */
else if (offset == 1)
m_spiker_expand_bgcolor = data;
/* offset 2 is the color */
else if (offset == 2)
m_spiker_expand_color = data;
}
uint8_t balsente_state::spiker_expand_r()
{
uint8_t left, right;
/* first rotate each nibble */
m_spiker_expand_bits = ((m_spiker_expand_bits << 1) & 0xee) | ((m_spiker_expand_bits >> 3) & 0x11);
/* compute left and right pixels */
left = (m_spiker_expand_bits & 0x10) ? m_spiker_expand_color : m_spiker_expand_bgcolor;
right = (m_spiker_expand_bits & 0x01) ? m_spiker_expand_color : m_spiker_expand_bgcolor;
/* reset the background color */
m_spiker_expand_bgcolor = 0;
/* return the combined result */
return (left & 0xf0) | (right & 0x0f);
}
void balsente_state::update_grudge_steering()
{
uint8_t wheel[3];
int8_t diff[3];
/* read the current steering values */
wheel[0] = ioport("AN0")->read();
wheel[1] = ioport("AN1")->read();
wheel[2] = ioport("AN2")->read();
/* diff the values */
diff[0] = wheel[0] - m_grudge_last_steering[0];
diff[1] = wheel[1] - m_grudge_last_steering[1];
diff[2] = wheel[2] - m_grudge_last_steering[2];
/* update the last values */
m_grudge_last_steering[0] += diff[0];
m_grudge_last_steering[1] += diff[1];
m_grudge_last_steering[2] += diff[2];
/* compute the result */
m_grudge_steering_result = 0xff;
if (diff[0])
{
m_grudge_steering_result ^= 0x01;
if (diff[0] > 0) m_grudge_steering_result ^= 0x02;
}
if (diff[1])
{
m_grudge_steering_result ^= 0x04;
if (diff[1] > 0) m_grudge_steering_result ^= 0x08;
}
if (diff[2])
{
m_grudge_steering_result ^= 0x10;
if (diff[2] > 0) m_grudge_steering_result ^= 0x20;
}
logerror("Recomputed steering\n");
}
uint8_t balsente_state::grudge_steering_r()
{
logerror("%s:grudge_steering_r(@%d)\n", machine().describe_context(), m_screen->vpos());
m_grudge_steering_result |= 0x80;
return m_grudge_steering_result;
}
/*************************************
*
* Shrike Avenger CPU memory handlers
*
*************************************/
uint8_t balsente_state::shrike_shared_6809_r(offs_t offset)
{
uint16_t mem_mask_int = offset & 1 ? 0xff00 : 0x00ff;
switch( offset )
{
case 6: // return OK for 68k status register until motors hooked up
return 0;
default:
return ( m_shrike_shared[offset >> 1] & ~mem_mask_int ) >> ( mem_mask_int & 8 );
}
}
void balsente_state::shrike_shared_6809_w(offs_t offset, uint8_t data)
{
uint16_t mem_mask_int = offset & 1 ? 0xff00 : 0x00ff;
m_shrike_shared[offset >> 1] = ( m_shrike_shared[offset >> 1] & mem_mask_int ) | ( data << ( mem_mask_int & 0x8 ) );
}
// uses movep, so writes even 8 bit addresses to odd 16 bit addresses, reads as 16 bit from odd addresses
// i.e. write 0xdeadbeef to 10000, read 0xde from 10001, 0xad from 10003, 0xbe from 10005...
void balsente_state::shrike_io_68k_w(offs_t offset, uint16_t data, uint16_t mem_mask)
{
COMBINE_DATA( &m_shrike_io[offset] );
}
uint16_t balsente_state::shrike_io_68k_r(offs_t offset, uint16_t mem_mask)
{
return ( m_shrike_io[offset] & mem_mask ) >> ( 8 & ~mem_mask );
}