Apple Lisa - Page 48

Confidential
C~
OCD
BRC
CBl
CB2
Lisa Hardware Reference Manual
7-Jul-81
The CMD bit controls the CMD/ line to the disk.
The CMD bit and the CMD/ line have the same level.
When the DEN bit is low, the OCD bit returns the
state of the disk interface OCD line.
Read Parity·permits a program to read the state of
the PARITY/ flip-flop after completion of a data
transfer. If RDP is high, there has been a parity
error detected.
Baud Rate Control. BRC is the output of the
Tl timer that is connected to the Baud Rate
Generator in the serial interface. It can
be used to produce odd baud rates.
CRt is PB7 on the other 6522 (the one on the
keyboard).
Unused.
CB2 is connected to the disk interface BSY
signal.
Page 48