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I/O Memory Allocations Section 2-3
2-3-2 CIO Area
Words in the CIO Area are allocated as Software Switches, which are manip-
ulated from the CPU Unit to control the operation of the Serial Communica-
tions Board or Unit, and for a Status Area, which contains status and error
information for the Serial Communications Board or Unit.
Serial Communications
Boards (CS Series Only)
Words CIO 1900 to CIO 1999 in the Inner Board Area are used for the Soft-
ware Switches and Status Area. CIO 1900 contains software switches, and
the 24 words from CIO 1901 to CIO 1924 are used for the Status Area.
Inner Board CIO Area
CIO 1900 to CIO 1999
Serial Communications
Units (CS/CJ Series)
Words are allocated in the CIO Area for Software Switches and Status Area.
Words CIO 1500 to CIO 1899 in the CPU Bus Unit Area in the CIO Area are
allocated according to the unit number setting. Each Unit is allocated 25
words. The first word is used for Software Switches, and the remaining 24
words are used for the Status Area.
CPU Bus Unit Area
CIO 1500 to CIO 1899
n = CIO 1500 + 25 × unit number
Words Usage
CIO 1900 Software switch
CIO 1901 to CIO 1904 Board status
CIO 1905 to CIO 1914 Port 1 status
CIO 1915 to CIO 1924 Port 2 status
CIO 1925 to CIO 1999 Reserved for the system
Unit No. Words
Unit No. 0 CIO 1500 to CIO 1524
Unit No. 1 CIO 1525 to CIO 1549
Unit No. 2 CIO 1550 to CIO 1574
Unit No. 3 CIO 1575 to CIO 1599
Unit No. 4 CIO 1600 to CIO 1624
Unit No. 5 CIO 1625 to CIO 1649
Unit No. 6 CIO 1650 to CIO 1674
Unit No. 7 CIO 1675 to CIO 1699
Unit No. 8 CIO 1700 to CIO 1724
Unit No. 9 CIO 1725 to CIO 1749
Unit No. A CIO 1750 to CIO 1774
Unit No. B CIO 1775 to CIO 1799
Unit No. C CIO 1800 to CIO 1824
Unit No. D CIO 1825 to CIO 1849
Unit No. E CIO 1850 to CIO 1874
Unit No. F CIO 1875 to CIO 1899
n: Software switches (Ports 1 and 2)
n + 1 to n + 4: Unit status
n + 5 to n + 14: Port 1 status
n + 15 to n + 24: Port 2 status
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