User`s manual
Bit(s)
11-12
13-15
Bit(s)
00
01
02
03-04
Table
3-11
(Cont)
Line
State Secondary Register Bit Assignments
Designation
Next Receive Mode
on
Marked Byte
Count
= 0
Function
Unused
When a
marked
receiver byte
count
reaches zero; the
Microprocessor transfers these bits
to
bits
00-02
of
the
Receiver Mode Bits
secondary
register
to
set the
mode
for
the
next
character(s)
to
be received.
Table 3-12
Line
Progress Secondary Register Bit Assignments
Designation
Send BCCI
Next
Send BCC2
Next
OLE Sending In
Progress
Function
(Not
intended
for access by the
PDP-II
program.)
Set
to
one
by
the
Microprocessor whenever:
1.
A
marked
transmitter
byte
count
has reached
zero
and
bit 10
of
this register
is
set
to
one.
")
A
transmit
control
byte
with bit
03
set
to
one
has been
fetched
by
the
MIcroprocessor tuse1ui
when an ITB, ETB,
or
ETX
has been
encountered
in BISYNC
protocol).
Cleared by
the
Microprocessor
if
LRC
or
the
first
BCC
has been
loaded
for transmission
by
the
Microprocessor.
(Not
intended
for access
by
the
PDP-II
program.)
Set
to
one
by the Microprocessor
when
LRC
or
the
first BCC has
been
loaded
for transmission,
but
reset
to
zero
again
if
LRC-8 is selected as
the
Block
Check
Type
for
the
associated line in Line
Protocol
03-04.
Set
to
zero
by
the
Microprocessor
when
the
second
BCC
byte
(BCC2) has
been
loaded
for transmission
by the Microprocessor.
(Not
intended
for access
by
the
PDP-II
program.)
Set
to
one by the Microprocessor
when
it
loads
a
Data Link Escape
character
for transmission
on
the
associated line in response
to
a
control
byte
command
bit
(01). Cleared by
the
Microprocessor
when
the
OLE
has
been
sent.
Unused
3-37
Read/Write
Read
or
Write
Read/Write
Read
Read
Read