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The following table shows which bits can be used as I/O bits in each of the
Expansion I/O Units. Bits in the shaded areas can be used as work bits but
not as output bits. The word addresses depend on the CPU that the Expan-
sion I/O Unit is coupled to. In all cases the first Expansion I/O Unit address
for input and output words is one more than the last CPU address for input
and output words. For example, the last CPU word address for a C40K CPU
is 03 and hence the first input or output word address for any of the Expan-
sion I/O Units coupled to a C40K CPU will be 04. In the tables below “n” is
the last CPU word allocated as an input or output word.
There are several models for some of the Units listed below. A blank space
(_) in the model number indicates that any of the applicable model numbers
could be inserted here.
08
09
10
11
12
13
14
15
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Word (n+1)
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
00
01
02
03
04
05
06
07
Word (n + 2)
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
00
01
02
03
04
05
06
07
Word (n + 3)
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Word (n + 2)
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
00
01
02
03
04
05
06
07
Word (n + 3)
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Word (n + 1)
00
01
02
03
04
05
06
07
Word (n + 1)
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Word (n + 1)
00
01
02
03
Word (n + 1)
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Word (n + 2)
08
09
10
11
12
13
14
15
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Word (n + 1)
Model Input bits Output bits Model Input bits Output bits
C20P
C16P
-Ij-j
C28P
C40P
C60P
C16P
-Oj-j
C4K-Ij
C4K-Oj
C4K-TM
Cannot
be used
Word (n+1)
Word (n+1)
Word (n+1)
Word (n + 2)
Word (n + 2)
Word (n + 4)
Word (n + 4)
08
09
10
11
indicates words that cannot be used for I/O,
but can be used as work bits.
00
01
02
03
Cannot
be used
Cannot
be
used.
Cannot
be
used.
I/O Bits Available in
Expansion I/O Units
Internal Relay (IR) Area Section 3-3