diff options
Diffstat (limited to 'src/devices/machine/mc68681.cpp')
-rw-r--r-- | src/devices/machine/mc68681.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/devices/machine/mc68681.cpp b/src/devices/machine/mc68681.cpp index 5b5d67aca92..f288a76971c 100644 --- a/src/devices/machine/mc68681.cpp +++ b/src/devices/machine/mc68681.cpp @@ -17,6 +17,10 @@ generates a 68000-compatible DTACK signal, instead of using generic RD and WR strobes as the 2681 does. The 68681 also adds a programmable interrupt vector, with an IACK input replacing IP6. + + The command register addresses should never be read from. Doing so may place + the baud rate generator into a test mode which drives the parallel outputs with + internal counters and causes serial ports to operate at uncontrollable rates. */ #include "emu.h" |