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-rw-r--r--src/devices/machine/6522via.cpp9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/devices/machine/6522via.cpp b/src/devices/machine/6522via.cpp
index a4ba3e58478..ae1b7da0f61 100644
--- a/src/devices/machine/6522via.cpp
+++ b/src/devices/machine/6522via.cpp
@@ -4,6 +4,9 @@
Rockwell 6522 VIA interface and emulation
+ This function emulates the functionality of up to 8 6522
+ versatile interface adapters.
+
This is based on the M6821 emulation in MAME.
To do:
@@ -208,6 +211,12 @@ void via6522_device::device_start()
m_shift_timer = timer_alloc(TIMER_SHIFT);
m_shift_irq_timer = timer_alloc(TIMER_SHIFT_IRQ);
+ /* Default clock is from CPU1 */
+ if (clock() == 0)
+ {
+ set_unscaled_clock(machine().firstcpu->clock());
+ }
+
/* save state register */
save_item(NAME(m_in_a));
save_item(NAME(m_in_ca1));