// license:BSD-3-Clause
// copyright-holders:Wilbert Pol
/*
* msx.c: MSX emulation
*
* Copyright (C) 2004 Sean Young
*
* Todo:
*
* - fix mouse support
* - cassette support doesn't work
* - Ensure changing cartridge after boot works
* - wd2793, nms8255
*/
#include "includes/msx.h"
#define VERBOSE 0
void msx_state::msx_irq_source(int source, int level)
{
assert(source >= 0 && source < ARRAY_LENGTH(m_irq_state));
m_irq_state[source] = level;
check_irq();
}
void msx_state::check_irq()
{
int state = CLEAR_LINE;
for (auto & elem : m_irq_state)
{
if (elem != CLEAR_LINE)
{
state = ASSERT_LINE;
}
}
m_maincpu->set_input_line(0, state);
}
void msx_state::machine_reset()
{
msx_memory_reset ();
msx_memory_map_all ();
for (auto & elem : m_irq_state)
{
elem = CLEAR_LINE;
}
check_irq();
}
void msx_state::machine_start()
{
m_port_c_old = 0xff;
}
static const uint8_t cc_op[0x100] = {
4+1,10+1, 7+1, 6+1, 4+1, 4+1, 7+1, 4+1, 4+1,11+1, 7+1, 6+1, 4+1, 4+1, 7+1, 4+1,
8+1,10+1, 7+1, 6+1, 4+1, 4+1, 7+1, 4+1,12+1,11+1, 7+1, 6+1, 4+1, 4+1, 7+1, 4+1,
7+1,10+1,16+1, 6+1, 4+1, 4+1, 7+1, 4+1, 7+1,11+1,16+1, 6+1, 4+1, 4+1, 7+1, 4+1,
7+1,10+1,13+1, 6+1,11+1,11+1,10+1, 4+1, 7+1,11+1,13+1, 6+1, 4+1, 4+1, 7+1, 4+1,
4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 7+1, 4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 7+1, 4+1,
4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 7+1, 4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 7+1, 4+1,
4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 7+1, 4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 7+1, 4+1,
7+1, 7+1, 7+1, 7+1, 7+1, 7+1, 4+1, 7+1, 4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 7+1, 4+1,
4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 7+1, 4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 7+1, 4+1,
4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 7+1, 4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 7+1, 4+1,
4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 7+1, 4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 7+1, 4+1,
4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 7+1, 4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 4+1, 7+1, 4+1,
5+1,10+1,10+1,10+1,10+1,11+1, 7+1,11+1, 5+1,10+1,10+1, 0 ,10+1,17+1, 7+1,11+1,
5+1,10+1,10+1,11+1,10+1,11+1, 7+1,11+1, 5+1, 4+1,10+1,11+1,10+1, 0 , 7+1,11+1,
5+1,10+1,10+1,19+1,10+1,11+1, 7+1,11+1, 5+1, 4+1,10+1, 4+1,10+1, 0 , 7+1,11+1,
5+1,10+1,10+1, 4+1,10+1,11+1, 7+1,11+1, 5+1, 6+1,10+1, 4+1,10+1, 0 , 7+1,11+1
};
static const uint8_t cc_cb[0x100] = {
8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2,12+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,12+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2,12+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,12+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2,12+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,12+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2,12+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,12+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,15+2, 8+2
};
static const uint8_t cc_ed[0x100] = {
8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,
12+2,12+2,15+2,20+2, 8+2,14+2, 8+2, 9+2,12+2,12+2,15+2,20+2, 8+2,14+2, 8+2, 9+2,
12+2,12+2,15+2,20+2, 8+2,14+2, 8+2, 9+2,12+2,12+2,15+2,20+2, 8+2,14+2, 8+2, 9+2,
12+2,12+2,15+2,20+2, 8+2,14+2, 8+2,18+2,12+2,12+2,15+2,20+2, 8+2,14+2, 8+2,18+2,
12+2,12+2,15+2,20+2, 8+2,14+2, 8+2, 8+2,12+2,12+2,15+2,20+2, 8+2,14+2, 8+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,
16+2,16+2,16+2,16+2, 8+2, 8+2, 8+2, 8+2,16+2,16+2,16+2,16+2, 8+2, 8+2, 8+2, 8+2,
16+2,16+2,16+2,16+2, 8+2, 8+2, 8+2, 8+2,16+2,16+2,16+2,16+2, 8+2, 8+2, 8+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2,
8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2, 8+2
};
static const uint8_t cc_xy[0x100] = {
4+4+2,10+4+2, 7+4+2, 6+4+2, 4+4+2, 4+4+2, 7+4+2, 4+4+2, 4+4+2,11+4+2, 7+4+2, 6+4+2, 4+4+2, 4+4+2, 7+4+2, 4+4+2,
8+4+2,10+4+2, 7+4+2, 6+4+2, 4+4+2, 4+4+2, 7+4+2, 4+4+2,12+4+2,11+4+2, 7+4+2, 6+4+2, 4+4+2, 4+4+2, 7+4+2, 4+4+2,
7+4+2,10+4+2,16+4+2, 6+4+2, 4+4+2, 4+4+2, 7+4+2, 4+4+2, 7+4+2,11+4+2,16+4+2, 6+4+2, 4+4+2, 4+4+2, 7+4+2, 4+4+2,
7+4+2,10+4+2,13+4+2, 6+4+2,23 +2,23 +2,19 +2, 4+4+2, 7+4+2,11+4+2,13+4+2, 6+4+2, 4+4+2, 4+4+2, 7+4+2, 4+4+2,
4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2,19 +2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2,19 +2, 4+4+2,
4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2,19 +2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2,19 +2, 4+4+2,
4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2,19 +2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2,19 +2, 4+4+2,
19 +2,19 +2,19 +2,19 +2,19 +2,19 +2, 4+4+2,19 +2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2,19 +2, 4+4+2,
4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2,19 +2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2,19 +2, 4+4+2,
4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2,19 +2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2,19 +2, 4+4+2,
4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2,19 +2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2,19 +2, 4+4+2,
4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2,19 +2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2, 4+4+2,19 +2, 4+4+2,
5+4+2,10+4+2,10+4+2,10+4+2,10+4+2,11+4+2, 7+4+2,11+4+2, 5+4+2,10+4+2,10+4+2, 0 ,10+4+2,17+4+2, 7+4+2,11+4+2,
5+4+2,10+4+2,10+4+2,11+4+2,10+4+2,11+4+2, 7+4+2,11+4+2, 5+4+2, 4+4+2,10+4+2,11+4+2,10+4+2, 4 +1, 7+4+2,11+4+2,
5+4+2,10+4+2,10+4+2,19+4+2,10+4+2,11+4+2, 7+4+2,11+4+2, 5+4+2, 4+4+2,10+4+2, 4+4+2,10+4+2, 4 +1, 7+4+2,11+4+2,
5+4+2,10+4+2,10+4+2, 4+4+2,10+4+2,11+4+2, 7+4+2,11+4+2, 5+4+2, 6+4+2,10+4+2, 4+4+2,10+4+2, 4 +1, 7+4+2,11+4+2
};
static const uint8_t cc_xycb[0x100] = {
23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,
23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,
23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,
23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,
20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,
20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,
20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,
20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,20+2,
23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,
23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,
23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,
23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,
23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,
23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,
23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,
23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2,23+2
};
/* extra cycles if jr/jp/call taken and 'interrupt latency' on rst 0-7 */
static const uint8_t cc_ex[0x100] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* DJNZ */
5, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, /* JR NZ/JR Z */
5, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, /* JR NC/JR C */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
5, 5, 5, 5, 0, 0, 0, 0, 5, 5, 5, 5, 0, 0, 0, 0, /* LDIR/CPIR/INIR/OTIR LDDR/CPDR/INDR/OTDR */
6, 0, 0, 0, 7, 0, 0, 2, 6, 0, 0, 0, 7, 0, 0, 2,
6, 0, 0, 0, 7, 0, 0, 2, 6, 0, 0, 0, 7, 0, 0, 2,
6, 0, 0, 0, 7, 0, 0, 2, 6, 0, 0, 0, 7, 0, 0, 2,
6, 0, 0, 0, 7, 0, 0, 2, 6, 0, 0, 0, 7, 0, 0, 2+1
};
void msx_state::driver_start()
{
m_maincpu->set_input_line_vector(0, 0xff);
msx_memory_init();
m_maincpu->z80_set_cycle_tables( cc_op, cc_cb, cc_ed, cc_xy, cc_xycb, cc_ex );
save_item(NAME(m_psg_b));
save_item(NAME(m_mouse));
save_item(NAME(m_mouse_stat));
save_item(NAME(m_rtc_latch));
save_item(NAME(m_kanji_latch));
save_item(NAME(m_slot_expanded));
save_item(NAME(m_primary_slot));
save_item(NAME(m_secondary_slot));
save_item(NAME(m_port_c_old));
save_item(NAME(m_keylatch));
save_item(NAME(m_current_switched_device));
save_item(NAME(m_irq_state));
machine().save().register_postload(save_prepost_delegate(FUNC(msx_state::post_load), this));
}
void msx_state::post_load()
{
for (int page = 0; page < 4; page++)
{
int slot_primary = (m_primary_slot >> (page * 2)) & 3;
int slot_secondary = (m_secondary_slot[slot_primary] >> (page * 2)) & 3;
m_current_page[page] = m_all_slots[slot_primary][slot_secondary][page];
}
}
INTERRUPT_GEN_MEMBER(msx_state::msx_interrupt)
{
m_mouse[0] = m_io_mouse0->read();
m_mouse_stat[0] = -1;
m_mouse[1] = m_io_mouse1->read();
m_mouse_stat[1] = -1;
}
/*
** The I/O functions
*/
READ8_MEMBER(msx_state::msx_psg_port_a_r)
{
uint8_t data;
data = (m_cassette->input() > 0.0038 ? 0x80 : 0);
if ( (m_psg_b ^ m_io_dsw->read() ) & 0x40)
{
/* game port 2 */
uint8_t inp = m_io_joy1->read();
if ( !(inp & 0x80) )
{
/* joystick */
data |= ( inp & 0x7f );
}
else
{
/* mouse */
data |= ( inp & 0x70 );
if (m_mouse_stat[1] < 0)
data |= 0xf;
else
data |= ~(m_mouse[1] >> (4*m_mouse_stat[1]) ) & 15;
}
}
else
{
/* game port 1 */
uint8_t inp = m_io_joy0->read();
if ( !(inp & 0x80) )
{
/* joystick */
data |= ( inp & 0x7f );
}
else
{
/* mouse */
data |= ( inp & 0x70 );
if (m_mouse_stat[0] < 0)
data |= 0xf;
else
data |= ~(m_mouse[0] >> (4*m_mouse_stat[0]) ) & 15;
}
}
return data;
}
READ8_MEMBER(msx_state::msx_psg_port_b_r)
{
return m_psg_b;
}
WRITE8_MEMBER(msx_state::msx_psg_port_a_w)
{
}
WRITE8_MEMBER(msx_state::msx_psg_port_b_w)
{
/* Arabic or kana mode led */
if ( (data ^ m_psg_b) & 0x80)
output().set_led_value(2, !(data & 0x80) );
if ( (m_psg_b ^ data) & 0x10)
{
if (++m_mouse_stat[0] > 3) m_mouse_stat[0] = -1;
}
if ( (m_psg_b ^ data) & 0x20)
{
if (++m_mouse_stat[1] > 3) m_mouse_stat[1] = -1;
}
m_psg_b = data;
}
/*
** RTC functions
*/
WRITE8_MEMBER( msx_state::msx_rtc_latch_w )
{
m_rtc_latch = data & 15;
}
WRITE8_MEMBER( msx_state::msx_rtc_reg_w )
{
m_rtc->write(space, m_rtc_latch, data);
}
READ8_MEMBER( msx_state::msx_rtc_reg_r )
{
return m_rtc->read(space, m_rtc_latch);
}
/*
** The PPI functions
*/
WRITE8_MEMBER( msx_state::msx_ppi_port_a_w )
{
m_primary_slot = data;
if (VERBOSE)
logerror ("write to primary slot select: %02x\n", m_primary_slot);
msx_memory_map_all ();
}
WRITE8_MEMBER( msx_state::msx_ppi_port_c_w )
{
m_keylatch = data & 0x0f;
/* caps lock */
if ( BIT(m_port_c_old ^ data, 6) )
output().set_led_value(1, !BIT(data, 6) );
/* key click */
if ( BIT(m_port_c_old ^ data, 7) )
m_dac->write(BIT(data, 7));
/* cassette motor on/off */
if ( BIT(m_port_c_old ^ data, 4) )
m_cassette->change_state(BIT(data, 4) ? CASSETTE_MOTOR_DISABLED : CASSETTE_MOTOR_ENABLED, CASSETTE_MASK_MOTOR);
/* cassette signal write */
if ( BIT(m_port_c_old ^ data, 5) )
m_cassette->output(BIT(data, 5) ? -1.0 : 1.0);
m_port_c_old = data;
}
READ8_MEMBER( msx_state::msx_ppi_port_b_r )
{
uint8_t result = 0xff;
int row, data;
row = m_keylatch;
if (row <= 10)
{
data = m_io_key[row / 2]->read();
if (BIT(row, 0))
data >>= 8;
result = data & 0xff;
}
return result;
}
/************************************************************************
*
* New memory emulation !!
*
***********************************************************************/
void msx_state::install_slot_pages(device_t &owner, uint8_t prim, uint8_t sec, uint8_t page, uint8_t numpages, device_t *device)
{
msx_state &msx = downcast<msx_state &>(owner);
msx_internal_slot_interface *internal_slot = dynamic_cast<msx_internal_slot_interface *>(device);
for ( int i = page; i < std::min(page + numpages, 4); i++ )
{
msx.m_all_slots[prim][sec][i] = internal_slot;
}
if ( sec )
{
msx.m_slot_expanded[prim] = true;
}
}
void msx_state::msx_memory_init()
{
int count_populated_pages = 0;
// Populate all unpopulated slots with the dummy interface
for (auto & elem : m_all_slots)
{
for ( int sec = 0; sec < 4; sec++ )
{
for ( int page = 0; page < 4; page++ )
{
if ( elem[sec][page] == nullptr )
{
elem[sec][page] = &m_empty_slot;
}
else
{
count_populated_pages++;
}
}
}
}
if ( count_populated_pages == 0 ) {
fatalerror("No msx slot layout defined for this system!\n");
}
}
void msx_state::msx_memory_reset ()
{
m_primary_slot = 0;
for (auto & elem : m_secondary_slot)
{
elem = 0;
}
}
void msx_state::msx_memory_map_page (uint8_t page)
{
int slot_primary = (m_primary_slot >> (page * 2)) & 3;
int slot_secondary = (m_secondary_slot[slot_primary] >> (page * 2)) & 3;
m_current_page[page] = m_all_slots[slot_primary][slot_secondary][page];
}
void msx_state::msx_memory_map_all ()
{
for (uint8_t i=0; i<4; i++)
msx_memory_map_page (i);
}
READ8_MEMBER( msx_state::msx_mem_read )
{
return m_current_page[offset >> 14]->read(space, offset);
}
WRITE8_MEMBER( msx_state::msx_mem_write )
{
m_current_page[offset >> 14]->write(space, offset, data);
}
WRITE8_MEMBER( msx_state::msx_sec_slot_w )
{
int slot = m_primary_slot >> 6;
if (m_slot_expanded[slot])
{
if (VERBOSE)
logerror ("write to secondary slot %d select: %02x\n", slot, data);
m_secondary_slot[slot] = data;
msx_memory_map_all ();
}
else
m_current_page[3]->write(space, 0xffff, data);
}
READ8_MEMBER( msx_state::msx_sec_slot_r )
{
int slot = m_primary_slot >> 6;
if (m_slot_expanded[slot])
{
return ~m_secondary_slot[slot];
}
else
{
return m_current_page[3]->read(space, 0xffff);
}
}
READ8_MEMBER( msx_state::msx_kanji_r )
{
uint8_t result = 0xff;
if (offset && m_region_kanji)
{
int latch = m_kanji_latch;
result = m_region_kanji->u8(latch++);
m_kanji_latch &= ~0x1f;
m_kanji_latch |= latch & 0x1f;
}
return result;
}
WRITE8_MEMBER( msx_state::msx_kanji_w )
{
if (offset)
m_kanji_latch = (m_kanji_latch & 0x007E0) | ((data & 0x3f) << 11);
else
m_kanji_latch = (m_kanji_latch & 0x1f800) | ((data & 0x3f) << 5);
}
READ8_MEMBER( msx_state::msx_switched_r )
{
// Read from selected switched device
return this->space().read_byte( (m_current_switched_device << 8) | offset );
}
WRITE8_MEMBER( msx_state::msx_switched_w )
{
if (offset == 0)
{
// Select switched device
m_current_switched_device = data;
}
else
{
// Write to selected switched device
this->space().write_byte( (m_current_switched_device << 8) | offset, data );
}
}