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Diffstat (limited to 'src/devices/bus/vic20/exp.cpp')
-rw-r--r--src/devices/bus/vic20/exp.cpp21
1 files changed, 16 insertions, 5 deletions
diff --git a/src/devices/bus/vic20/exp.cpp b/src/devices/bus/vic20/exp.cpp
index e70bda544bc..93f00290a27 100644
--- a/src/devices/bus/vic20/exp.cpp
+++ b/src/devices/bus/vic20/exp.cpp
@@ -70,12 +70,27 @@ vic20_expansion_slot_device::vic20_expansion_slot_device(const machine_config &m
//-------------------------------------------------
+// device_validity_check -
+//-------------------------------------------------
+
+void vic20_expansion_slot_device::device_validity_check(validity_checker &valid) const
+{
+ device_t *const carddev = get_card_device();
+ if (carddev && !dynamic_cast<device_vic20_expansion_card_interface *>(carddev))
+ osd_printf_error("Card device %s (%s) does not implement device_vic20_expansion_card_interface\n", carddev->tag(), carddev->name());
+}
+
+
+//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void vic20_expansion_slot_device::device_start()
{
- m_card = dynamic_cast<device_vic20_expansion_card_interface *>(get_card_device());
+ device_t *const carddev = get_card_device();
+ m_card = dynamic_cast<device_vic20_expansion_card_interface *>(carddev);
+ if (carddev && !m_card)
+ fatalerror("Card device %s (%s) does not implement device_vic20_expansion_card_interface\n", carddev->tag(), carddev->name());
// resolve callbacks
m_write_irq.resolve_safe();
@@ -98,10 +113,6 @@ void vic20_expansion_slot_device::device_start()
void vic20_expansion_slot_device::device_reset()
{
- if (get_card_device())
- {
- get_card_device()->reset();
- }
}