diff options
Diffstat (limited to 'src/devices/machine/at_keybc.cpp')
-rw-r--r-- | src/devices/machine/at_keybc.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/devices/machine/at_keybc.cpp b/src/devices/machine/at_keybc.cpp index c6d2e037973..80cea51d4d2 100644 --- a/src/devices/machine/at_keybc.cpp +++ b/src/devices/machine/at_keybc.cpp @@ -12,6 +12,13 @@ are no longer implemented, the pin assignments are different, and interrupt outputs are latched externally using a 74ALS74 at ZM87. + Many of the ICs that provide functional compatibility with the AT + and/or PS/2 "8042" keyboard controllers do not incorporate actual + UPI-41 microcontroller cores. This even applies to some directly + equivalent 40-pin DIPs such as the JETkey "Keyboard BIOS" V3.0 + and V5.0, which were found to be Samsung Electronics ASICs when + decapped. + PC/AT I/O pin assignments: P10: NC no connection P11: NC no connection |