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dec0.cpp latch cleanup: 'LS374 sensed positive edge others are educted guesses

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This commit is contained in:
Vas Crabb 2017-01-29 21:14:23 +11:00
parent 6b88671241
commit 1296414948
2 changed files with 37 additions and 29 deletions
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4
src/mame/includes/dec0.h
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@ -54,8 +54,8 @@ public:
optional_shared_ptr<uint8_t> m_hippodrm_shared_ram;
mcu_type m_game;
int m_i8751_return;
int m_i8751_command;
uint16_t m_i8751_return;
uint16_t m_i8751_command;
int m_slyspy_state;
int m_hippodrm_msb;
int m_hippodrm_lsb;

62
src/mame/machine/dec0.cpp
View File

@ -10,7 +10,9 @@ Data East machine functions - Bryan McPhail, mish@tendril.co.uk
#include "emu.h"
#include "includes/dec0.h"
#include "cpu/h6280/h6280.h"
#include "cpu/m68000/m68000.h"
#include "cpu/mcs51/mcs51.h"
@ -165,39 +167,35 @@ WRITE16_MEMBER(dec0_state::hippodrm_68000_share_w)
READ8_MEMBER(dec0_state::dec0_mcu_port_r)
{
int latchEnable=m_i8751_ports[2]>>4;
uint8_t result = 0xff;
// P0 connected to 4 latches
if (offset==0)
// P0 connected to latches
if (offset == 0)
{
if ((latchEnable&1)==0)
return m_i8751_command>>8;
else if ((latchEnable&2)==0)
return m_i8751_command&0xff;
else if ((latchEnable&4)==0)
return m_i8751_return>>8;
else if ((latchEnable&8)==0)
return m_i8751_return&0xff;
if (!BIT(m_i8751_ports[2], 4))
result &= m_i8751_command >> 8;
if (!BIT(m_i8751_ports[2], 5))
result &= m_i8751_command & 0x00ff;
}
return 0xff;
return result;
}
WRITE8_MEMBER(dec0_state::dec0_mcu_port_w)
{
m_i8751_ports[offset]=data;
if (offset==2)
if (offset == 2)
{
if ((data&0x4)==0)
m_maincpu->set_input_line(5, HOLD_LINE);
if ((data&0x8)==0)
if (!BIT(data, 2) && BIT(m_i8751_ports[2], 2))
m_maincpu->set_input_line(M68K_IRQ_5, HOLD_LINE);
if (!BIT(data, 3))
m_mcu->set_input_line(MCS51_INT1_LINE, CLEAR_LINE);
if ((data&0x40)==0)
m_i8751_return=(m_i8751_return&0xff00)|(m_i8751_ports[0]);
if ((data&0x80)==0)
m_i8751_return=(m_i8751_return&0xff)|(m_i8751_ports[0]<<8);
if (BIT(data, 6) && !BIT(m_i8751_ports[2], 6))
m_i8751_return = (m_i8751_return & 0xff00) | m_i8751_ports[0];
if (BIT(data, 7) && !BIT(m_i8751_ports[2], 7))
m_i8751_return = (m_i8751_return & 0x00ff) | (m_i8751_ports[0] << 8);
}
m_i8751_ports[offset] = data;
}
void dec0_state::baddudes_i8751_write(int data)
@ -300,12 +298,22 @@ void dec0_state::birdtry_i8751_write(int data)
void dec0_state::dec0_i8751_write(int data)
{
m_i8751_command=data;
m_i8751_command = data;
/* Writes to this address cause an IRQ to the i8751 microcontroller */
if (m_game == mcu_type::EMULATED) m_mcu->set_input_line(MCS51_INT1_LINE, ASSERT_LINE);
if (m_game == mcu_type::BADDUDES_SIM) baddudes_i8751_write(data);
if (m_game == mcu_type::BIRDTRY_SIM) birdtry_i8751_write(data);
/* Writes to this address raise an IRQ on the i8751 microcontroller */
switch (m_game)
{
case mcu_type::EMULATED:
if (BIT(m_i8751_ports[2], 3))
m_mcu->set_input_line(MCS51_INT1_LINE, ASSERT_LINE);
break;
case mcu_type::BADDUDES_SIM:
baddudes_i8751_write(data);
break;
case mcu_type::BIRDTRY_SIM:
birdtry_i8751_write(data);
break;
}
//logerror("%s: warning - write %02x to i8751\n",machine().describe_context(),data);
}