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-rw-r--r-- | src/devices/machine/i8155.cpp | 7 |
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. + **********************************************************************/ /* |