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-rw-r--r--src/mame/ibm/ptpc110.cpp4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/mame/ibm/ptpc110.cpp b/src/mame/ibm/ptpc110.cpp
index 37cbf8c8a2c..0e935e1ce98 100644
--- a/src/mame/ibm/ptpc110.cpp
+++ b/src/mame/ibm/ptpc110.cpp
@@ -185,8 +185,10 @@ void ptpc110_state::main_map(address_map &map)
void ptpc110_state::main_io(address_map &map)
{
// map.unmap_value_high();
- map(0x0024, 0x0027).nopw(); // noisy on $26
+ map(0x0024, 0x0027).nopw(); // noisy on $24-$25, additional address/data config
+ map(0x004c, 0x004f).nopw(); // timestamp on $4f
// map(0x03b0, 0x03df).m(m_vga, FUNC(f65535_vga_device::io_map));
+// map(0x03e0, 0x03e3) Ricoh RB5C396
// map(0x15ec, 0x15ef) PCMCIA?
// map(0x35e8, 0x35eb) ^
}