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i8214: Back out previous changes to device emulation in e383606922 except as a system-specific hack

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This commit is contained in:
AJR 2022-05-04 15:25:31 -04:00
parent 8ffa5ef1d9
commit b76ff4cf64
3 changed files with 14 additions and 8 deletions
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16
src/devices/machine/i8214.cpp
View File

@ -8,10 +8,8 @@
#include "emu.h"
#include "i8214.h"
#include <iostream>
//#define VERBOSE 1
//#define LOG_OUTPUT_STREAM std::cout
#include "logmacro.h"
@ -42,8 +40,8 @@ void i8214_device::trigger_interrupt(int level)
// set interrupt line
m_write_int(ASSERT_LINE);
//m_write_int(CLEAR_LINE);
if (!m_int_dis_hack)
m_write_int(CLEAR_LINE); // TODO: wait one clock cycle to clear
}
@ -56,7 +54,7 @@ void i8214_device::check_interrupt()
if (m_int_dis)
{
LOG("not checking interrupts because m_int_dis (%02x)\n", m_r);
if (m_r == 0xff)
if (m_int_dis_hack && m_r == 0xff)
{
m_int_dis = 0;
m_write_int(CLEAR_LINE);
@ -98,8 +96,11 @@ void i8214_device::check_interrupt()
}
}
m_int_dis = 0;
m_write_int(CLEAR_LINE);
if (m_int_dis_hack)
{
m_int_dis = 0;
m_write_int(CLEAR_LINE);
}
}
@ -116,6 +117,7 @@ i8214_device::i8214_device(const machine_config &mconfig, const char *tag, devic
: device_t(mconfig, I8214, tag, owner, clock)
, m_write_int(*this)
, m_write_enlg(*this)
, m_int_dis_hack(false)
, m_inte(0)
, m_int_dis(0)
, m_a(0)

4
src/devices/machine/i8214.h
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@ -32,6 +32,8 @@ public:
// construction/destruction
i8214_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
void set_int_dis_hack(bool hack) { m_int_dis_hack = hack; }
auto int_wr_callback() { return m_write_int.bind(); }
auto enlg_wr_callback() { return m_write_enlg.bind(); }
@ -58,6 +60,8 @@ private:
devcb_write_line m_write_int;
devcb_write_line m_write_enlg;
bool m_int_dis_hack;
int m_inte; // interrupt enable
int m_int_dis; // interrupt (latch) disable flip-flop
int m_a; // request level

2
src/mame/drivers/pc8801.cpp
View File

@ -1710,7 +1710,6 @@ void pc8801_state::pc8801(machine_config &config)
Z80(config, m_maincpu, MASTER_CLOCK); // ~4 MHz, selectable to ~8 MHz on late models
m_maincpu->set_addrmap(AS_PROGRAM, &pc8801_state::main_map);
m_maincpu->set_addrmap(AS_IO, &pc8801_state::main_io);
// m_maincpu->set_vblank_int("screen", FUNC(pc8801_state::vrtc_irq_w));
m_maincpu->set_irq_acknowledge_callback(FUNC(pc8801_state::int_ack_cb));
PC80S31(config, m_pc80s31, MASTER_CLOCK);
@ -1721,6 +1720,7 @@ void pc8801_state::pc8801(machine_config &config)
I8214(config, m_pic, MASTER_CLOCK);
m_pic->int_wr_callback().set(FUNC(pc8801_state::irq_w));
m_pic->set_int_dis_hack(true);
UPD1990A(config, m_rtc);
//CENTRONICS(config, "centronics", centronics_devices, "printer");