// 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 (int i = 0; i < ARRAY_LENGTH(m_irq_state); i++) { if (m_irq_state[i] != 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 (int i = 0; i < ARRAY_LENGTH(m_irq_state); i++) { m_irq_state[i] = CLEAR_LINE; } check_irq(); } void msx_state::machine_start() { m_port_c_old = 0xff; } static const UINT8 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 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 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 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 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 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]; } } TIMER_DEVICE_CALLBACK_MEMBER(msx_state::msx2_interrupt) { m_v9938->set_resolution(m_io_dsw->read() & 0x03); m_v9938->interrupt(); } TIMER_DEVICE_CALLBACK_MEMBER(msx_state::msx2p_interrupt) { m_v9958->set_resolution(m_io_dsw->read() & 0x03); m_v9958->interrupt(); } 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 data; data = (m_cassette->input() > 0.0038 ? 0x80 : 0); if ( (m_psg_b ^ m_io_dsw->read() ) & 0x40) { /* game port 2 */ UINT8 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 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) set_led_status (machine(), 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) ) set_led_status (machine(), 1, !BIT(data, 6) ); /* key click */ if ( BIT(m_port_c_old ^ data, 7) ) m_dac->write_signed8(BIT(data, 7) ? 0x7f : 0); /* 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 result = 0xff; int row, data; ioport_port *keynames[] = { m_io_key0, m_io_key1, m_io_key2, m_io_key3, m_io_key4, m_io_key5 }; row = m_keylatch; if (row <= 10) { data = keynames[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 prim, UINT8 sec, UINT8 page, UINT8 numpages, device_t *device) { msx_state &msx = downcast(owner); msx_internal_slot_interface *internal_slot = dynamic_cast(device); for ( int i = page; i < 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 ( int prim = 0; prim < 4; prim++ ) { for ( int sec = 0; sec < 4; sec++ ) { for ( int page = 0; page < 4; page++ ) { if ( m_all_slots[prim][sec][page] == NULL ) { m_all_slots[prim][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 (int prim=0; prim<4; prim++) { m_secondary_slot[prim] = 0; } } void msx_state::msx_memory_map_page (UINT8 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 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 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 ); } }