summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/drivers/kingdrby.cpp
diff options
context:
space:
mode:
author AJR <ajrhacker@users.noreply.github.com>2017-09-09 00:48:13 -0400
committer AJR <ajrhacker@users.noreply.github.com>2017-09-09 00:48:38 -0400
commita99be799b251842c9d8f6bb3864747e81358bf07 (patch)
tree5eac2f518c4cc11f4f917b8a5a70f597eb875040 /src/mame/drivers/kingdrby.cpp
parentb3651664382090a41b938f4473b7b261f3d89f15 (diff)
kingdrby.cpp: More plausible method of generating NMI on sound CPU (nw)
Diffstat (limited to 'src/mame/drivers/kingdrby.cpp')
-rw-r--r--src/mame/drivers/kingdrby.cpp4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/mame/drivers/kingdrby.cpp b/src/mame/drivers/kingdrby.cpp
index 15b9b1e4436..90f87d7b628 100644
--- a/src/mame/drivers/kingdrby.cpp
+++ b/src/mame/drivers/kingdrby.cpp
@@ -304,7 +304,7 @@ WRITE8_MEMBER(kingdrby_state::hopper_io_w)
WRITE8_MEMBER(kingdrby_state::sound_cmd_w)
{
- m_soundcpu->set_input_line(INPUT_LINE_NMI, PULSE_LINE);
+ m_soundcpu->set_input_line(INPUT_LINE_NMI, BIT(data, 7) ? ASSERT_LINE : CLEAR_LINE);
m_sound_cmd = data;
/* soundlatch is unneeded since we are already using perfect interleave. */
// m_soundlatch->write(space,0, data);
@@ -955,6 +955,7 @@ static MACHINE_CONFIG_START( kingdrby )
// 6000-6003 PPI group modes 0/0 - B & C (lower) as input, A & C (upper) as output.
MCFG_DEVICE_ADD("ppi8255_1", I8255A, 0)
MCFG_I8255_OUT_PORTA_CB(WRITE8(kingdrby_state, sound_cmd_w))
+ MCFG_I8255_TRISTATE_PORTA_CB(CONSTANT(0x7f))
MCFG_I8255_IN_PORTB_CB(READ8(kingdrby_state, key_matrix_r))
MCFG_I8255_IN_PORTC_CB(READ8(kingdrby_state, input_mux_r))
MCFG_I8255_OUT_PORTC_CB(WRITE8(kingdrby_state, outport2_w))
@@ -995,6 +996,7 @@ static MACHINE_CONFIG_DERIVED( kingdrbb, kingdrby )
MCFG_DEVICE_ADD("ppi8255_0", I8255A, 0)
/* C as input, (all) as output */
MCFG_I8255_OUT_PORTA_CB(WRITE8(kingdrby_state, sound_cmd_w))
+ MCFG_I8255_TRISTATE_PORTA_CB(CONSTANT(0x7f))
MCFG_I8255_IN_PORTB_CB(IOPORT("IN0"))
MCFG_I8255_OUT_PORTB_CB(WRITE8(kingdrby_state, outportb_w))
MCFG_I8255_IN_PORTC_CB(IOPORT("IN1"))