summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/drivers/bombjack.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/mame/drivers/bombjack.cpp')
-rw-r--r--src/mame/drivers/bombjack.cpp29
1 files changed, 9 insertions, 20 deletions
diff --git a/src/mame/drivers/bombjack.cpp b/src/mame/drivers/bombjack.cpp
index fe15cb6b990..db11f6e322b 100644
--- a/src/mame/drivers/bombjack.cpp
+++ b/src/mame/drivers/bombjack.cpp
@@ -106,23 +106,13 @@ Dip Locations and factory settings verified with manual
#include "speaker.h"
-TIMER_CALLBACK_MEMBER(bombjack_state::soundlatch_callback)
+READ8_MEMBER(bombjack_state::soundlatch_read_and_clear)
{
- m_latch = param;
-}
-
-WRITE8_MEMBER(bombjack_state::bombjack_soundlatch_w)
-{
- /* make all the CPUs synchronize, and only AFTER that write the new command to the latch */
- machine().scheduler().synchronize(timer_expired_delegate(FUNC(bombjack_state::soundlatch_callback),this), data);
-}
-
-READ8_MEMBER(bombjack_state::bombjack_soundlatch_r)
-{
- int res;
-
- res = m_latch;
- m_latch = 0;
+ // An extra flip-flop is used to clear the LS273 after reading it through a LS245
+ // (this flip-flop is then cleared in sync with the sound CPU clock)
+ uint8_t res = m_soundlatch->read(space, 0);
+ if (!machine().side_effect_disabled())
+ m_soundlatch->clear_w(space, 0, 0);
return res;
}
@@ -155,14 +145,14 @@ static ADDRESS_MAP_START( main_map, AS_PROGRAM, 8, bombjack_state )
AM_RANGE(0xb004, 0xb004) AM_READ_PORT("DSW1")
AM_RANGE(0xb004, 0xb004) AM_WRITE(bombjack_flipscreen_w)
AM_RANGE(0xb005, 0xb005) AM_READ_PORT("DSW2")
- AM_RANGE(0xb800, 0xb800) AM_WRITE(bombjack_soundlatch_w)
+ AM_RANGE(0xb800, 0xb800) AM_DEVWRITE("soundlatch", generic_latch_8_device, write)
AM_RANGE(0xc000, 0xdfff) AM_ROM
ADDRESS_MAP_END
static ADDRESS_MAP_START( audio_map, AS_PROGRAM, 8, bombjack_state )
AM_RANGE(0x0000, 0x1fff) AM_ROM
AM_RANGE(0x4000, 0x43ff) AM_RAM
- AM_RANGE(0x6000, 0x6000) AM_READ(bombjack_soundlatch_r)
+ AM_RANGE(0x6000, 0x6000) AM_READ(soundlatch_read_and_clear)
ADDRESS_MAP_END
static ADDRESS_MAP_START( audio_io_map, AS_IO, 8, bombjack_state )
@@ -336,14 +326,12 @@ GFXDECODE_END
void bombjack_state::machine_start()
{
- save_item(NAME(m_latch));
save_item(NAME(m_background_image));
}
void bombjack_state::machine_reset()
{
- m_latch = 0;
m_background_image = 0;
}
@@ -366,6 +354,7 @@ static MACHINE_CONFIG_START( bombjack )
MCFG_CPU_IO_MAP(audio_io_map)
MCFG_CPU_VBLANK_INT_DRIVER("screen", bombjack_state, nmi_line_pulse)
+ MCFG_GENERIC_LATCH_8_ADD("soundlatch")
/* video hardware */
MCFG_SCREEN_ADD("screen", RASTER)