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Diffstat (limited to 'src/devices/cpu/m6502/st2xxx.cpp')
-rw-r--r--src/devices/cpu/m6502/st2xxx.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/devices/cpu/m6502/st2xxx.cpp b/src/devices/cpu/m6502/st2xxx.cpp
index 8905e9942d4..5748668b6c3 100644
--- a/src/devices/cpu/m6502/st2xxx.cpp
+++ b/src/devices/cpu/m6502/st2xxx.cpp
@@ -124,6 +124,7 @@ u8 st2xxx_device::pdata_r(offs_t offset)
void st2xxx_device::pdata_w(offs_t offset, u8 data)
{
+ // Set output state (CMOS or open drain) or activate/deactive pullups for input pins
if (data != m_pdata[offset])
{
m_pdata[offset] = data;