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-rw-r--r--src/devices/machine/6522via.cpp15
1 files changed, 15 insertions, 0 deletions
diff --git a/src/devices/machine/6522via.cpp b/src/devices/machine/6522via.cpp
index 0027ba7389a..240de545092 100644
--- a/src/devices/machine/6522via.cpp
+++ b/src/devices/machine/6522via.cpp
@@ -576,6 +576,11 @@ void via6522_device::output_pa()
m_out_a_handler(pa);
}
+uint8_t via6522_device::read_pa() const
+{
+ return (m_out_a & m_ddr_a) | ~m_ddr_a;
+}
+
uint8_t via6522_device::input_pb()
{
uint8_t pb = m_in_b & ~m_ddr_b;
@@ -604,6 +609,16 @@ void via6522_device::output_pb()
m_out_b_handler(pb);
}
+uint8_t via6522_device::read_pb() const
+{
+ uint8_t pb = (m_out_b & m_ddr_b) | ~m_ddr_b;
+
+ if (T1_SET_PB7(m_acr))
+ pb = (pb & 0x7f) | (m_t1_pb7 << 7);
+
+ return pb;
+}
+
/*-------------------------------------------------
via_r - CPU interface for VIA read
-------------------------------------------------*/