static void control_b_w(const device_config *device, UINT8 data)
{
pia6821_state *p = get_token(device);
int temp;
/* bit 7 and 6 are read only */
data &= 0x3f;
LOG(("PIA #%s: control B write = %02X\n", device->tag, data));
/* update the control register */
p->ctl_b = data;
if (C2_SET_MODE(p->ctl_b))
/* set/reset mode - bit value determines the new output */
temp = C2_SET(p->ctl_b);
else
/* strobe mode - output is always high unless strobed */
temp = TRUE;
set_out_cb2(device, temp);
/* update externals */
update_interrupts(device);
}
void pia6821_device::control_b_w(UINT8 data)
{
int temp;
// bit 7 and 6 are read only
data &= 0x3f;
LOG(("PIA #%s: control B write = %02X\n", tag(), data));
// update the control register
m_ctl_b = data;
if (C2_SET_MODE(m_ctl_b))
{
// set/reset mode - bit value determines the new output
temp = C2_SET(m_ctl_b);
}
else
{
// strobe mode - output is always high unless strobed
temp = TRUE;
}
set_out_cb2(temp);
// update externals
update_interrupts();
}
void pia_write(int which, int offset, int data)
{
pia6821 *p = pia + which;
/* adjust offset for 16-bit and ordering */
offset &= 3;
if (p->addr & PIA_ALTERNATE_ORDERING) offset = swizzle_address[offset];
switch (offset)
{
/******************* port A output/DDR write *******************/
case PIA_DDRA:
/* write output register */
if (OUTPUT_SELECTED(p->ctl_a))
{
LOG(("%04x: PIA%d port A write = %02X\n", activecpu_get_previouspc(), which, data));
/* update the output value */
p->out_a = data;/* & p->ddr_a; */ /* NS990130 - don't mask now, DDR could change later */
/* send it to the output function */
if (p->intf->out_a_func && p->ddr_a) p->intf->out_a_func(0, p->out_a & p->ddr_a); /* NS990130 */
}
/* write DDR register */
else
{
LOG(("%04x: PIA%d DDR A write = %02X\n", activecpu_get_previouspc(), which, data));
if (p->ddr_a != data)
{
/* NS990130 - if DDR changed, call the callback again */
p->ddr_a = data;
/* send it to the output function */
if (p->intf->out_a_func && p->ddr_a) p->intf->out_a_func(0, p->out_a & p->ddr_a);
}
}
break;
/******************* port B output/DDR write *******************/
case PIA_DDRB:
/* write output register */
if (OUTPUT_SELECTED(p->ctl_b))
{
LOG(("%04x: PIA%d port B write = %02X\n", activecpu_get_previouspc(), which, data));
/* update the output value */
p->out_b = data;/* & p->ddr_b */ /* NS990130 - don't mask now, DDR could change later */
/* send it to the output function */
if (p->intf->out_b_func && p->ddr_b) p->intf->out_b_func(0, p->out_b & p->ddr_b); /* NS990130 */
/* CB2 is configured as output and in write strobe mode */
if (C2_OUTPUT(p->ctl_b) && C2_STROBE_MODE(p->ctl_b))
{
/* this will cause a transition low; call the output function if we're currently high */
if (p->out_cb2)
if (p->intf->out_cb2_func) p->intf->out_cb2_func(0, 0);
p->out_cb2 = 0;
/* if the CB2 strobe is cleared by the E, reset it right away */
if (STROBE_E_RESET(p->ctl_b))
{
if (p->intf->out_cb2_func) p->intf->out_cb2_func(0, 1);
p->out_cb2 = 1;
}
}
}
/* write DDR register */
else
{
LOG(("%04x: PIA%d DDR B write = %02X\n", activecpu_get_previouspc(), which, data));
if (p->ddr_b != data)
{
/* NS990130 - if DDR changed, call the callback again */
p->ddr_b = data;
/* send it to the output function */
if (p->intf->out_b_func && p->ddr_b) p->intf->out_b_func(0, p->out_b & p->ddr_b);
}
}
break;
/******************* port A control write *******************/
case PIA_CTLA:
/* Bit 7 and 6 read only - PD 16/01/00 */
data &= 0x3f;
LOG(("%04x: PIA%d control A write = %02X\n", activecpu_get_previouspc(), which, data));
/* CA2 is configured as output */
if (C2_OUTPUT(data))
{
int temp;
if (C2_SET_MODE(data))
{
/* set/reset mode--bit value determines the new output */
temp = SET_C2(data) ? 1 : 0;
}
else {
/* strobe mode--output is always high unless strobed. */
temp = 1;
}
/* if we're going from input to output mode, or we're already in output mode
and this change creates a transition, call the CA2 output function */
if (C2_INPUT(p->ctl_a) || (C2_OUTPUT(p->ctl_a) && (p->out_ca2 ^ temp)))
if (p->intf->out_ca2_func) p->intf->out_ca2_func(0, temp);
/* set the new value */
p->out_ca2 = temp;
}
/* update the control register */
p->ctl_a = data;
/* update externals */
update_6821_interrupts(p);
break;
/******************* port B control write *******************/
case PIA_CTLB:
/* Bit 7 and 6 read only - PD 16/01/00 */
data &= 0x3f;
LOG(("%04x: PIA%d control B write = %02X\n", activecpu_get_previouspc(), which, data));
/* CB2 is configured as output */
if (C2_OUTPUT(data))
{
int temp;
if (C2_SET_MODE(data))
{
/* set/reset mode--bit value determines the new output */
temp = SET_C2(data) ? 1 : 0;
}
else {
/* strobe mode--output is always high unless strobed. */
temp = 1;
}
/* if we're going from input to output mode, or we're already in output mode
and this change creates a transition, call the CB2 output function */
if (C2_INPUT(p->ctl_b) || (C2_OUTPUT(p->ctl_b) && (p->out_cb2 ^ temp)))
if (p->intf->out_cb2_func) p->intf->out_cb2_func(0, temp);
/* set the new value */
p->out_cb2 = temp;
}
/* update the control register */
p->ctl_b = data;
/* update externals */
update_6821_interrupts(p);
break;
}
}
