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author hap <happppp@users.noreply.github.com>2020-01-24 15:55:11 +0100
committer hap <happppp@users.noreply.github.com>2020-01-24 15:55:24 +0100
commit659e410ec6674cd53b7e2bfe7fc85e8c005dbd18 (patch)
tree8e4910d6f62d6f5ac951eed2557cbd5d34ba6c38 /src/mame/drivers/fidel_as12.cpp
parentb2c486b0c2530425eb14d3012c4403d5251559cf (diff)
New working clones
------------------ Excel 68000 Mach IV 68020 Master 2325 [hap, Berger]
Diffstat (limited to 'src/mame/drivers/fidel_as12.cpp')
-rw-r--r--src/mame/drivers/fidel_as12.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mame/drivers/fidel_as12.cpp b/src/mame/drivers/fidel_as12.cpp
index 5a578a71144..1e4cd37ee7e 100644
--- a/src/mame/drivers/fidel_as12.cpp
+++ b/src/mame/drivers/fidel_as12.cpp
@@ -215,7 +215,7 @@ void as12_state::as12(machine_config &config)
m_maincpu->set_addrmap(AS_PROGRAM, &as12_state::div_trampoline);
ADDRESS_MAP_BANK(config, m_mainmap).set_map(&as12_state::main_map).set_options(ENDIANNESS_LITTLE, 8, 16);
- const attotime irq_period = attotime::from_hz(585); // from 556 timer (22nF, 110K, 1K)
+ const attotime irq_period = attotime::from_hz(600); // from 556 timer (22nF, 110K, 1K), ideal frequency is 600Hz
TIMER(config, m_irq_on).configure_periodic(FUNC(as12_state::irq_on<M6502_IRQ_LINE>), irq_period);
m_irq_on->set_start_delay(irq_period - attotime::from_nsec(15250)); // active for 15.25us
TIMER(config, "irq_off").configure_periodic(FUNC(as12_state::irq_off<M6502_IRQ_LINE>), irq_period);