UINT8 z80pio_d_r(int which, int ch)
{
z80pio *pio = pios + which;
switch (pio->mode[ch])
{
case PIO_MODE0: /* mode 0 output */
return pio->out[ch];
case PIO_MODE1: /* mode 1 input */
set_rdy(pio, ch, 1); /* ready = H */
update_irq_state(pio, ch);
return pio->in[ch];
case PIO_MODE2: /* mode 2 i/o */
if (ch) logerror("PIO-B mode 2 \n");
set_rdy(pio, 1, 1); /* brdy = H */
update_irq_state(pio, ch);
return pio->in[ch];
case PIO_MODE3: /* mode 3 bit */
return (pio->in[ch] & pio->dir[ch]) | (pio->out[ch] & ~pio->dir[ch]);
}
logerror("PIO-%c data read,bad mode\n",'A'+ch );
return 0;
}
void z80pio_p_w(int which, UINT8 ch, UINT8 data)
{
z80pio *pio = pios + which;
pio->in[ch] = data;
switch (pio->mode[ch])
{
case PIO_MODE0:
logerror("PIO-%c OUTPUT mode and data write\n",'A'+ch );
break;
case PIO_MODE2: /* only port A */
ch = 1; /* handshake and IRQ is use portB */
case PIO_MODE1:
set_rdy(pio, ch, 0);
update_irq_state(pio, ch);
break;
case PIO_MODE3:
/* irq check */
update_irq_state(pio, ch);
break;
}
}
void luxor_55_21056_device::abcbus_out(UINT8 data)
{
if (m_cs)
{
m_out = data;
if (STAT_DIR && !m_rdy) set_rdy(!m_rdy);
}
}
void luxor_55_21056_device::device_reset()
{
m_maincpu->reset();
m_cs = false;
m_stat = 0;
m_sasi_data = 0;
set_rdy(m_rdy);
}
UINT8 luxor_55_21056_device::abcbus_inp()
{
UINT8 data = 0xff;
if (m_cs && !STAT_DIR)
{
data = m_inp;
if (m_rdy) set_rdy(!m_rdy);
}
return data;
}
static void z80pio_update_strobe(const device_config *device, int ch, int state)
{
z80pio_t *z80pio = get_safe_token( device );
switch (z80pio->mode[ch])
{
/* output mode: a positive edge is used by peripheral to acknowledge
the receipt of data */
case PIO_MODE0:
{
/* ensure valid */
state = state & 0x01;
/* strobe changed state? */
if ((z80pio->strobe[ch] ^ state) != 0)
{
/* yes */
if (state != 0)
{
/* positive edge */
VPRINTF(("PIO-%c positive strobe\n",'A' + ch));
/* ready is now inactive */
set_rdy(device, ch, 0);
/* int enabled? */
if (z80pio->enable[ch] & PIO_INT_ENABLE)
{
/* trigger an int request */
z80pio->int_state[ch] |= Z80_DAISY_INT;
}
}
}
/* store strobe state */
z80pio->strobe[ch] = state;
/* check interrupt */
interrupt_check(device);
}
break;
/* input mode: strobe is used by peripheral to load data from the peripheral
into port a input register, data loaded into pio when signal is active */
default:
break;
}
}
static DEVICE_RESET( z80pio )
{
z80pio_t *z80pio = get_safe_token( device );
int i;
for (i = 0; i < 2; i++)
{
z80pio->mask[i] = 0xff; /* mask all on */
z80pio->enable[i] = 0x00; /* disable */
z80pio->mode[i] = 0x01; /* mode input */
z80pio->dir[i] = 0x01; /* dir input */
set_rdy(device, i, 0); /* RDY = low */
z80pio->out[i] = 0x00; /* outdata = 0 */
z80pio->int_state[i] = 0;
z80pio->strobe[i] = 0;
}
interrupt_check(device);
}
void z80pio_reset(int which)
{
z80pio *pio = pios + which;
int i;
for (i = 0; i < 2; i++)
{
pio->mask[i] = 0xff; /* mask all on */
pio->enable[i] = 0x00; /* disable */
pio->mode[i] = 0x01; /* mode input */
pio->dir[i] = 0x01; /* dir input */
set_rdy(pio, i, 0); /* RDY = low */
pio->out[i] = 0x00; /* outdata = 0 */
pio->int_state[i] = 0;
pio->strobe[i] = 0;
}
interrupt_check(which);
}
int z80pio_p_r(int which, UINT8 ch)
{
z80pio *pio = pios + which;
switch (pio->mode[ch])
{
case PIO_MODE2: /* port A only */
case PIO_MODE0:
set_rdy(pio, ch, 0);
update_irq_state(pio, ch);
break;
case PIO_MODE1:
logerror("PIO-%c INPUT mode and data read\n",'A'+ch );
break;
case PIO_MODE3:
return (pio->in[ch] & pio->dir[ch]) | (pio->out[ch] & ~pio->dir[ch]);
}
return pio->out[ch];
}
void z80pio_d_w(int which, int ch, UINT8 data)
{
z80pio *pio = pios + which;
pio->out[ch] = data; /* latch out data */
switch (pio->mode[ch])
{
case PIO_MODE0: /* mode 0 output */
case PIO_MODE2: /* mode 2 i/o */
set_rdy(pio, ch, 1); /* ready = H */
update_irq_state(pio, ch);
return;
case PIO_MODE1: /* mode 1 input */
case PIO_MODE3: /* mode 0 bit */
return;
default:
logerror("PIO-%c data write,bad mode\n",'A'+ch );
}
}
