diff options
Diffstat (limited to 'src/mame/machine/lkage.cpp')
-rw-r--r-- | src/mame/machine/lkage.cpp | 141 |
1 files changed, 0 insertions, 141 deletions
diff --git a/src/mame/machine/lkage.cpp b/src/mame/machine/lkage.cpp deleted file mode 100644 index 3235f08e72c..00000000000 --- a/src/mame/machine/lkage.cpp +++ /dev/null @@ -1,141 +0,0 @@ -// license:BSD-3-Clause -// copyright-holders:Phil Stroffolino -/*************************************************************************** - - machine.c - - Functions to emulate general aspects of the machine (RAM, ROM, interrupts, - I/O ports) - -***************************************************************************/ - -#include "emu.h" -#include "includes/lkage.h" - - -/*************************************************************************** - - Legend of Kage 68705 protection interface - - The following is ENTIRELY GUESSWORK!!! - And moreover, the game seems to work anyway regardless of what the mcu returns. - -***************************************************************************/ - -READ8_MEMBER(lkage_state::lkage_68705_port_a_r) -{ - //logerror("%04x: 68705 port A read %02x\n", space.device().safe_pc(), m_port_a_in); - return (m_port_a_out & m_ddr_a) | (m_port_a_in & ~m_ddr_a); -} - -WRITE8_MEMBER(lkage_state::lkage_68705_port_a_w) -{ - //logerror("%04x: 68705 port A write %02x\n", space.device().safe_pc(), data); - m_port_a_out = data; -} - -WRITE8_MEMBER(lkage_state::lkage_68705_ddr_a_w) -{ - m_ddr_a = data; -} - - - -/* - * Port B connections: - * - * all bits are logical 1 when read (+5V pullup) - * - * 1 W when 1->0, enables latch which brings the command from main CPU (read from port A) - * 2 W when 0->1, copies port A to the latch for the main CPU - */ - -READ8_MEMBER(lkage_state::lkage_68705_port_b_r) -{ - return (m_port_b_out & m_ddr_b) | (m_port_b_in & ~m_ddr_b); -} - -WRITE8_MEMBER(lkage_state::lkage_68705_port_b_w) -{ - //logerror("%04x: 68705 port B write %02x\n", space.device().safe_pc(), data); - - if ((m_ddr_b & 0x02) && (~data & 0x02) && (m_port_b_out & 0x02)) - { - m_port_a_in = m_from_main; - if (m_main_sent) - m_mcu->set_input_line(0, CLEAR_LINE); - - m_main_sent = 0; - logerror("read command %02x from main cpu\n", m_port_a_in); - } - - if ((m_ddr_b & 0x04) && (data & 0x04) && (~m_port_b_out & 0x04)) - { - logerror("send command %02x to main cpu\n", m_port_a_out); - m_from_mcu = m_port_a_out; - m_mcu_sent = 1; - } - - m_port_b_out = data; -} - -WRITE8_MEMBER(lkage_state::lkage_68705_ddr_b_w) -{ - m_ddr_b = data; -} - - - -READ8_MEMBER(lkage_state::lkage_68705_port_c_r) -{ - m_port_c_in = 0; - if (m_main_sent) - m_port_c_in |= 0x01; - if (!m_mcu_sent) - m_port_c_in |= 0x02; - - //logerror("%04x: 68705 port C read %02x\n", space.device().safe_pc(), m_port_c_in); - return (m_port_c_out & m_ddr_c) | (m_port_c_in & ~m_ddr_c); -} - -WRITE8_MEMBER(lkage_state::lkage_68705_port_c_w) -{ - logerror("%04x: 68705 port C write %02x\n", space.device().safe_pc(), data); - m_port_c_out = data; -} - -WRITE8_MEMBER(lkage_state::lkage_68705_ddr_c_w) -{ - m_ddr_c = data; -} - - -WRITE8_MEMBER(lkage_state::lkage_mcu_w) -{ - logerror("%04x: mcu_w %02x\n", space.device().safe_pc(), data); - m_from_main = data; - m_main_sent = 1; - m_mcu->set_input_line(0, ASSERT_LINE); -} - -READ8_MEMBER(lkage_state::lkage_mcu_r) -{ - logerror("%04x: mcu_r %02x\n", space.device().safe_pc(), m_from_mcu); - m_mcu_sent = 0; - return m_from_mcu; -} - -READ8_MEMBER(lkage_state::lkage_mcu_status_r) -{ - int res = 0; - - /* bit 0 = when 1, mcu is ready to receive data from main cpu */ - /* bit 1 = when 1, mcu has sent data to the main cpu */ - //logerror("%04x: mcu_status_r\n", space.device().safe_pc()); - if (!m_main_sent) - res |= 0x01; - if (m_mcu_sent) - res |= 0x02; - - return res; -} |