// license:BSD-3-Clause
// copyright-holders:Robbbert
#include "includes/kaypro.h"
/***********************************************************
PIO
Port B is unused on both PIOs
************************************************************/
WRITE_LINE_MEMBER( kaypro_state::write_centronics_busy )
{
m_centronics_busy = state;
}
READ8_MEMBER( kaypro_state::pio_system_r )
{
UINT8 data = 0;
/* centronics busy */
data |= m_centronics_busy << 3;
/* PA7 is pulled high */
data |= 0x80;
return data;
}
WRITE8_MEMBER( kaypro_state::kayproii_pio_system_w )
{
/* d7 bank select
d6 disk drive motors - (0=on)
d5 double-density enable (0=double density)
d4 Centronics strobe
d2 side select (1=side 1)
d1 drive B
d0 drive A */
membank("bankr0")->set_entry(BIT(data, 7));
membank("bank3")->set_entry(BIT(data, 7));
m_is_motor_off = BIT(data, 6);
m_floppy = NULL;
if (BIT(data, 0))
m_floppy = m_floppy0->get_device();
else
if (BIT(data, 1))
m_floppy = m_floppy1->get_device();
m_fdc->set_floppy(m_floppy);
m_fdc->dden_w(BIT(data, 5));
if (m_floppy)
{
m_floppy->mon_w(BIT(data, 6)); // motor on
m_floppy->ss_w(!BIT(data, 2)); // signal exists even though drives are single sided
}
output_set_value("ledA", BIT(data, 0)); /* LEDs in artwork */
output_set_value("ledB", BIT(data, 1));
m_centronics->write_strobe(BIT(data, 4));
m_system_port = data;
}
WRITE8_MEMBER( kaypro_state::kaypro4_pio_system_w )
{
kayproii_pio_system_w(space, offset, data);
/* side select */
m_floppy->ss_w(BIT(data, 2));
}
/***********************************************************
KAYPRO2X SYSTEM PORT
The PIOs were replaced by a few standard 74xx chips
************************************************************/
READ8_MEMBER( kaypro_state::kaypro2x_system_port_r )
{
UINT8 data = m_centronics_busy << 6;
return (m_system_port & 0xbf) | data;
}
WRITE8_MEMBER( kaypro_state::kaypro2x_system_port_w )
{
/* d7 bank select
d6 alternate character set (write only)
d5 double-density enable
d4 disk drive motors (1=on)
d3 Centronics strobe
d2 side select (appears that 0=side 1?)
d1 drive B
d0 drive A */
membank("bankr0")->set_entry(BIT(data, 7));
membank("bank3")->set_entry(BIT(data, 7));
m_is_motor_off = !BIT(data, 4);
m_floppy = NULL;
if (!BIT(data, 0))
m_floppy = m_floppy0->get_device();
else
if (m_floppy1 && (!BIT(data, 1)))
m_floppy = m_floppy1->get_device();
m_fdc->set_floppy(m_floppy);
m_fdc->dden_w(BIT(data, 5));
if (m_floppy)
{
m_floppy->mon_w(!BIT(data, 4)); // motor on
m_floppy->ss_w(!BIT(data, 2));
}
output_set_value("ledA", BIT(data, 0)); /* LEDs in artwork */
output_set_value("ledB", BIT(data, 1));
m_centronics->write_strobe(BIT(data, 3));
m_system_port = data;
}
/***********************************************************************
SIO
On Kaypro2x, Channel B on both SIOs is hardwired to 300 baud.
Both devices on sio2 (printer and modem) are not emulated.
************************************************************************/
/* Set baud rate. bits 0..3 Rx and Tx are tied together. Baud Rate Generator is a AY-5-8116, SMC8116, WD1943, etc.
00h 50
11h 75
22h 110
33h 134.5
44h 150
55h 300
66h 600
77h 1200
88h 1800
99h 2000
AAh 2400
BBh 3600
CCh 4800
DDh 7200
EEh 9600
FFh 19200 */
READ8_MEMBER(kaypro_state::kaypro_sio_r)
{
if (offset == 1)
return kay_kbd_d_r(machine());
else
if (offset == 3)
return kay_kbd_c_r(machine());
else
return m_sio->cd_ba_r(space, offset);
}
WRITE8_MEMBER(kaypro_state::kaypro_sio_w)
{
if (offset == 1)
kay_kbd_d_w(machine(), data);
else
m_sio->cd_ba_w(space, offset, data);
}
/*************************************************************************************
Floppy DIsk
If DRQ or IRQ is set, and cpu is halted, the NMI goes low.
Since the HALT occurs last (and has no callback mechanism), we need to set
a short delay, to give time for the processor to execute the HALT before NMI
becomes active.
*************************************************************************************/
void kaypro_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
bool halt;
switch (id)
{
case TIMER_FLOPPY:
halt = (bool)m_maincpu->state_int(Z80_HALT);
if (m_is_motor_off)
{
timer_set(attotime::from_hz(10), TIMER_FLOPPY);
break;
}
if ((halt) && (m_fdc_rq & 3) && (m_fdc_rq < 0x80))
{
m_maincpu->set_input_line(INPUT_LINE_NMI, ASSERT_LINE);
m_fdc_rq |= 0x80;
}
else
if ((m_fdc_rq == 0x80) || ((!halt) && BIT(m_fdc_rq, 7)))
{
m_maincpu->set_input_line(INPUT_LINE_NMI, CLEAR_LINE);
m_fdc_rq &= 0x7f;
}
timer_set(attotime::from_hz(1e5), TIMER_FLOPPY);
break;
default:
assert_always(FALSE, "Unknown id in kaypro_state::device_timer");
}
}
WRITE_LINE_MEMBER( kaypro_state::fdc_intrq_w )
{
m_fdc_rq = (m_fdc_rq & 0x82) | state;
}
WRITE_LINE_MEMBER( kaypro_state::fdc_drq_w )
{
m_fdc_rq = (m_fdc_rq & 0x81) | (state << 1);
}
/***********************************************************
Machine
************************************************************/
MACHINE_START_MEMBER( kaypro_state,kayproii )
{
m_pio_s->strobe_a(0);
}
MACHINE_RESET_MEMBER( kaypro_state,kaypro )
{
MACHINE_RESET_CALL_MEMBER(kay_kbd);
membank("bankr0")->set_entry(1); // point at rom
membank("bankw0")->set_entry(0); // always write to ram
membank("bank3")->set_entry(1); // point at video ram
m_system_port = 0x80;
m_fdc_rq = 0;
m_maincpu->reset();
timer_set(attotime::from_hz(1), TIMER_FLOPPY); /* kick-start the nmi timer */
}
/***********************************************************
Quickload
This loads a .COM file to address 0x100 then jumps
there. Sometimes .COM has been renamed to .CPM to
prevent windows going ballistic. These can be loaded
as well.
************************************************************/
QUICKLOAD_LOAD_MEMBER( kaypro_state, kaypro )
{
UINT8 *RAM = memregion("rambank")->base();
UINT16 i;
UINT8 data;
/* Load image to the TPA (Transient Program Area) */
for (i = 0; i < quickload_size; i++)
{
if (image.fread( &data, 1) != 1) return IMAGE_INIT_FAIL;
RAM[i+0x100] = data;
}
membank("bankr0")->set_entry(0);
membank("bank3")->set_entry(0);
RAM[0x80]=0; // clear out command tail
RAM[0x81]=0;
m_maincpu->set_pc(0x100); // start program
return IMAGE_INIT_PASS;
}