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author AJR <ajrhacker@users.noreply.github.com>2017-10-09 23:12:20 -0400
committer AJR <ajrhacker@users.noreply.github.com>2017-10-09 23:12:39 -0400
commit3c48b3a1e85b2d40260dadc5249c89b224d08413 (patch)
treeffc8c678b7af1817b566a146af1d8f876baed544 /src/devices/machine/i8155.cpp
parent03d7b524d1db469a2ae113e12aedbb36295cf88a (diff)
i8155: Trivia (nw)
Diffstat (limited to 'src/devices/machine/i8155.cpp')
-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.
+
**********************************************************************/
/*