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// license:BSD-3-Clause
// copyright-holders:Robbbert
/* Super80.cpp written by Robbbert, 2005-2009. See driver source for documentation. */
#include "emu.h"
#include "includes/super80.h"
#include "machine/z80bin.h"
/**************************** PIO ******************************************************************************/
void super80_state::pio_port_a_w(u8 data)
{
m_keylatch = data;
m_pio->port_b_write(pio_port_b_r()); // refresh kbd int
}
uint8_t super80_state::pio_port_b_r()
{
uint8_t data = 0xff;
for (int i = 0; i < 8; i++)
if (!BIT(m_keylatch, i))
data &= m_io_keyboard[i]->read();
m_key_pressed = 3;
return data;
}
/**************************** CASSETTE ROUTINES *****************************************************************/
void super80_state::cassette_motor( bool motor_state )
{
// relay sound
if (BIT(m_last_data, 1) != motor_state)
m_samples->start(0, motor_state ? 0 : 1);
if (motor_state)
m_cassette->change_state(CASSETTE_MOTOR_DISABLED,CASSETTE_MASK_MOTOR);
else
m_cassette->change_state(CASSETTE_MOTOR_ENABLED,CASSETTE_MASK_MOTOR);
/* does user want to hear the sound? */
if (BIT(m_io_config->read(), 3))
m_cassette->change_state(CASSETTE_SPEAKER_ENABLED,CASSETTE_MASK_SPEAKER);
else
m_cassette->change_state(CASSETTE_SPEAKER_MUTED,CASSETTE_MASK_SPEAKER);
}
/********************************************* TIMER ************************************************/
// If normal keyboard scan has stopped, then do a scan to allow the interrupt key sequence
TIMER_DEVICE_CALLBACK_MEMBER( super80_state::timer_k )
{
if (m_key_pressed)
m_key_pressed--;
else
if (!m_key_pressed)
m_pio->port_b_write(pio_port_b_r());
}
/* cassette load circuit
This "emulates" U79 CD4046BCN PLL chip and U1 LM311P op-amp. U79 converts a frequency to a voltage,
and U1 amplifies that voltage to digital levels. U1 has a trimpot connected, to set the midpoint.
The MDS homebrew input circuit consists of 2 op-amps followed by a D-flipflop.
The "read-any-system" cassette circuit is a CA3140 op-amp, the smarts being done in software.
bit 0 = original system (U79 and U1)
bit 1 = MDS fast system
bit 2 = CA3140 */
TIMER_DEVICE_CALLBACK_MEMBER( super80_state::kansas_r )
{
uint8_t cass_ws=0;
m_cass_data[1]++;
cass_ws = ((m_cassette)->input() > +0.03) ? 4 : 0;
if (cass_ws != m_cass_data[0])
{
if (cass_ws) m_cass_data[3] ^= 2; // the MDS flipflop
m_cass_data[0] = cass_ws;
m_cass_data[2] = ((m_cass_data[1] < 0x0d) ? 1 : 0) | cass_ws | m_cass_data[3];
m_cass_data[1] = 0;
}
}
TIMER_DEVICE_CALLBACK_MEMBER( super80_state::timer_h )
{
uint8_t go_fast = 0;
if ( (!BIT(m_portf0, 2)) || (!BIT(m_io_config->read(), 1)) ) // bit 2 of port F0 is low, OR user turned on config switch
go_fast++; // must be 1 at boot so banking works correctly
/* code to slow down computer to 1 MHz by halting cpu on every second frame */
if (!go_fast)
{
if (!m_int_sw)
m_maincpu->set_input_line(INPUT_LINE_HALT, ASSERT_LINE); // if going, stop it
m_int_sw++;
if (m_int_sw > 1)
{
m_maincpu->set_input_line(INPUT_LINE_HALT, CLEAR_LINE); // if stopped, start it
m_int_sw = 0;
}
}
else
{
if (m_int_sw < 8) // @2MHz, reset just once
{
m_maincpu->set_input_line(INPUT_LINE_HALT, CLEAR_LINE);
m_int_sw = 8; // ...not every time
}
}
}
/*************************************** PRINTER ********************************************************/
/* The Super80 had an optional I/O card that plugged into the S-100 slot. The card had facility for running
an 8-bit Centronics printer, and a serial device at 300, 600, or 1200 baud. The I/O address range
was selectable via 4 dipswitches. The serial parameters (baud rate, parity, stop bits, etc) was
chosen with more dipswitches. Regretably, no parameters could be set by software. Currently, the
Centronics printer is emulated; the serial side of things may be done later, as will the dipswitches.
The most commonly used I/O range is DC-DE (DC = centronics, DD = serial data, DE = serial control
All the home-brew roms use this, except for super80e which uses BC-BE. */
/**************************** I/O PORTS *****************************************************************/
u8 super80v_state::port3e_r()
{
return 0xF8 | (m_fdc->intrq_r() << 0) | (m_fdc->drq_r() << 1) | 4;
}
// UFDC board can support 4 drives; we support 2
void super80v_state::port3f_w(u8 data)
{
// m_fdc->58(BIT(data, 0)); 5/8 pin not emulated in wd_fdc
m_fdc->enmf_w(BIT(data,1));
floppy_image_device *floppy = nullptr;
if (BIT(data, 2)) floppy = m_floppy0->get_device();
if (BIT(data, 3)) floppy = m_floppy1->get_device();
if (BIT(data, 4)) floppy = m_floppy2->get_device();
if (BIT(data, 5)) floppy = m_floppy3->get_device();
m_fdc->set_floppy(floppy);
if (floppy)
{
floppy->mon_w(0);
floppy->ss_w(BIT(data, 6));
}
m_fdc->dden_w(BIT(data, 7));
}
u8 super80_state::portf2_r()
{
u8 data = m_io_dsw->read() & 0xf0; // dip switches on pcb
data |= m_cass_data[2]; // bit 0 = output of U1, bit 1 = MDS cass state, bit 2 = current wave_state
data |= 0x08; // bit 3 - not used
return data;
}
void super80_state::portdc_w(u8 data)
{
// hardware strobe driven from port select, bit 7..0 = data
m_cent_data_out->write(data);
m_centronics->write_strobe(0);
m_centronics->write_strobe(1);
}
void super80_state::portf0_w(u8 data)
{
u8 bits = data ^ m_last_data;
m_portf0 = data;
m_speaker->level_w(BIT(data, 3)); // bit 3 - speaker
if (BIT(bits, 1)) cassette_motor(BIT(data, 1)); // bit 1 - cassette motor
m_cassette->output( BIT(data, 0) ? -1.0 : +1.0); // bit 0 - cass out
m_last_data = data;
}
/**************************** BASIC MACHINE CONSTRUCTION ***********************************************************/
void super80_state::machine_start_common()
{
m_cass_led.resolve();
// register for savestates
save_item(NAME(m_portf0));
save_item(NAME(m_s_options));
save_item(NAME(m_palette_index));
save_item(NAME(m_keylatch));
save_item(NAME(m_cass_data));
save_item(NAME(m_key_pressed));
save_item(NAME(m_boot_in_progress));
save_item(NAME(m_last_data));
}
void super80_state::machine_start()
{
machine_start_common();
save_item(NAME(m_int_sw));
save_item(NAME(m_vidpg));
save_item(NAME(m_current_charset));
}
void super80v_state::machine_start()
{
// zerofill
m_vram = make_unique_clear<u8[]>(0x3000);
save_pointer(NAME(m_vram), 0x3000);
machine_start_common();
}
void super80_state::machine_reset_common()
{
m_boot_in_progress = true;
m_portf0 = 0; // must be 0 like real machine, or banking breaks on 32-col systems
m_keylatch = 0xff;
m_key_pressed = 0;
m_palette_index = 0;
address_space &program = m_maincpu->space(AS_PROGRAM);
program.install_rom(0x0000, 0x0fff, m_rom); // do it here for F3
m_rom_shadow_tap.remove();
m_rom_shadow_tap = program.install_read_tap(
0xc000, 0xcfff,
"rom_shadow_r",
[this] (offs_t offset, u8 &data, u8 mem_mask)
{
if (!machine().side_effects_disabled())
{
// delete this tap
m_rom_shadow_tap.remove();
// reinstall RAM over the ROM shadow
m_maincpu->space(AS_PROGRAM).install_ram(0x0000, 0x0fff, m_ram);
}
},
&m_rom_shadow_tap);
}
void super80_state::machine_reset()
{
machine_reset_common();
m_vidpg = 0xfe00;
}
void super80v_state::machine_reset()
{
machine_reset_common();
}
/*-------------------------------------------------
QUICKLOAD_LOAD_MEMBER( super80_state, super80 )
-------------------------------------------------*/
QUICKLOAD_LOAD_MEMBER(super80_state::quickload_cb)
{
uint16_t exec_addr, start_addr, end_addr;
// load the binary into memory
if (z80bin_load_file(image, m_maincpu->space(AS_PROGRAM), exec_addr, start_addr, end_addr) != image_init_result::PASS)
return image_init_result::FAIL;
// is this file executable?
if (exec_addr != 0xffff)
// check to see if autorun is on
if (BIT(m_io_config->read(), 0))
m_maincpu->set_pc(exec_addr);
return image_init_result::PASS;
}
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