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I/O Allocation for CPM2C-S PCs Section 4-2
4-2 I/O Allocation for CPM2C-S PCs
This section shows how I/O bits are actually allocated to the input and output
terminals on the CPU Unit and Expansion I/O Units. Bits in the words that are
not allocated to I/O can be used as work bits.
4-2-1 CPU Units
Input bits are allocated starting from IR 00000 and output bits are allocated
starting from IR 01000. In the following diagram, shaded areas indicate bits
actually used for inputs or outputs.
4-2-2 Expansion I/O Units and Expansion Units
Up to 3 Expansion Units or Expansion I/O Units can be connected to a
CPM2C-S PC. Input bits and output bits are automatically allocated starting
from the CPU Unit and continuing through Expansion Units and Expansion
I/O Units in the order in which they are connected. The input area consists of
the 10 words from IR 000 to 009, and the output area consists of the 10 words
from IR 010 to 019.
Note m: “m” denotes the last input word allocated to the CPU Unit, or to the previ-
ous Expansion Unit or Expansion I/O Unit if one is already connected.
n: “n” denotes the last output word allocated to the CPU Unit, or to the previ-
ous Expansion Unit or Expansion I/O Unit if one is already connected.
Inputs
Outputs
IR 000
IR 010
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Do not use
6 inputs
IR 00000
to
IR 00005
4 outputs
IR 01000
to
IR 01003
Bits
No. of I/O Model number I/O Allocated bits Max. No. of Units
8 CPM2C-8ED
@
Input 8 inputs: Word (m+1), bits 00 to 07 3
Output ---
16 CPM2C-16ED @ Input 16 inputs: Word (m+1), bits 00 to 15 3
Output ---
8 CPM2C-8ER
CPM2C-8ET
@
CPM2C-8ET1
@
Input --- 3
Output 8 outputs: Word (n+1), bits 00 to 07
16 CPM2C-16ET @
CPM2C-16ET1 @
Input --- 3
Output 16 outputs: Word (n+1), bits 00 to 15
10 CPM2C-10EDR Input 6 inputs: Word (m+1), bits 00 to 05 3
Output 4 outputs: Word (n+1), bits 00 to 03
20 CPM2C-20EDR Input 12 inputs: Word (m+1), bits 00 to 11 3
Output 8 outputs: Word (n+1), bits 00 to 07
24 CPM2C-24EDT @
CPM2C-24EDT1 @
Input 16 inputs: Word (m+1), bits 00 to 15 3
Output 8 outputs: Word (n+1), bits 00 to 07
32 CPM2C-32EDT @
CPM2C-32EDT1 @
Input 16 inputs: Word (m+1), bits 00 to 15 3
Output 16 outputs: Word (n+1), bits 00 to 15