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-rw-r--r--src/devices/machine/i8155.cpp7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/devices/machine/i8155.cpp b/src/devices/machine/i8155.cpp
index fcb44bafe30..f543ec4573f 100644
--- a/src/devices/machine/i8155.cpp
+++ b/src/devices/machine/i8155.cpp
@@ -4,6 +4,13 @@
Intel 8155/8156 - 2048-Bit Static MOS RAM with I/O Ports and Timer emulation
+ The only difference between 8155 and 8156 is that pin 8 (CE) is
+ active low on the former device and active high on the latter.
+
+ National's NSC810 RAM-I/O-Timer is pin-compatible with the Intel
+ 8156, but has different I/O registers (including a second timer)
+ with incompatible mapping.
+
**********************************************************************/
/*