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// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic
/***************************************************************************
UT88 machine driver by Miodrag Milanovic
06/03/2008 Preliminary driver.
****************************************************************************/
#include "emu.h"
#include "cpu/i8085/i8085.h"
#include "imagedev/cassette.h"
#include "machine/i8255.h"
#include "includes/ut88.h"
static const uint8_t hex_to_7seg[16] =
{
0x3F, 0x06, 0x5B, 0x4F,
0x66, 0x6D, 0x7D, 0x07,
0x7F, 0x6F, 0x77, 0x7c,
0x39, 0x5e, 0x79, 0x71
};
/* Driver initialization */
TIMER_DEVICE_CALLBACK_MEMBER(ut88mini_state::display_timer)
{
for (u8 i = 0; i < 6; i++)
m_digits[i] = hex_to_7seg[m_lcd_digit[i]];
}
uint8_t ut88_state::ppi_portb_r()
{
uint8_t data = 0xff;
if (BIT(m_keyboard_mask, 0))
data &= m_io_line0->read();
if (BIT(m_keyboard_mask, 1))
data &= m_io_line1->read();
if (BIT(m_keyboard_mask, 2))
data &= m_io_line2->read();
if (BIT(m_keyboard_mask, 3))
data &= m_io_line3->read();
if (BIT(m_keyboard_mask, 4))
data &= m_io_line4->read();
if (BIT(m_keyboard_mask, 5))
data &= m_io_line5->read();
if (BIT(m_keyboard_mask, 6))
data &= m_io_line6->read();
if (BIT(m_keyboard_mask, 7))
data &= m_io_line7->read();
return data;
}
uint8_t ut88_state::ppi_portc_r()
{
return m_io_line8->read();
}
void ut88_state::ppi_porta_w(uint8_t data)
{
m_keyboard_mask = data ^ 0xff;
}
void ut88_state::machine_reset()
{
m_keyboard_mask = 0;
address_space &program = m_maincpu->space(AS_PROGRAM);
program.install_rom(0x0000, 0x07ff, m_rom); // do it here for F3
m_rom_shadow_tap.remove();
m_rom_shadow_tap = program.install_read_tap(
0xf800, 0xffff,
"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, 0x07ff, m_ram);
}
},
&m_rom_shadow_tap);
}
void ut88_state::machine_start()
{
save_item(NAME(m_keyboard_mask));
}
uint8_t ut88_state::keyboard_r(offs_t offset)
{
return m_ppi->read(offset ^ 0x03);
}
void ut88_state::keyboard_w(offs_t offset, uint8_t data)
{
m_ppi->write(offset ^ 0x03, data);
}
void ut88_state::sound_w(uint8_t data)
{
m_dac->write(BIT(data, 0));
m_cassette->output(BIT(data, 0) ? 1 : -1);
}
uint8_t ut88_common::tape_r()
{
double level = m_cassette->input();
return (level < 0) ? 0 : 0xff;
}
uint8_t ut88mini_state::keyboard_r()
{
// This is real keyboard implementation
uint8_t *keyrom1 = m_proms->base();
uint8_t *keyrom2 = m_proms->base()+0x100;
uint8_t key = keyrom2[m_io_line1->read()];
// if keyboard 2nd part returned 0 on 4th bit, output from
// first part is used
if (!BIT(key, 3))
key = keyrom1[m_io_line0->read()];
// for delete key there is special key producing code 0x80
key = (BIT(m_io_line2->read(), 7)) ? key : 0x80;
// If key 0 is pressed its value is 0x10 this is done by additional
// discrete logic
key = (BIT(m_io_line0->read(), 0)) ? key : 0x10;
return key;
}
void ut88mini_state::led_w(offs_t offset, uint8_t data)
{
switch(offset)
{
case 0: m_lcd_digit[4] = (data >> 4) & 0x0f;
m_lcd_digit[5] = data & 0x0f;
break;
case 1: m_lcd_digit[2] = (data >> 4) & 0x0f;
m_lcd_digit[3] = data & 0x0f;
break;
case 2: m_lcd_digit[0] = (data >> 4) & 0x0f;
m_lcd_digit[1] = data & 0x0f;
break;
}
}
void ut88mini_state::machine_start()
{
m_digits.resolve();
save_item(NAME(m_lcd_digit));
}
void ut88mini_state::machine_reset()
{
m_lcd_digit[0] = m_lcd_digit[1] = m_lcd_digit[2] = 0;
m_lcd_digit[3] = m_lcd_digit[4] = m_lcd_digit[5] = 0;
}
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