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Basic I/O Unit Instructions Section 3-22
Operands C: Depends on Special I/O Unit or CPU Bus Unit.
D: Special I/O Unit: 0000 to 005F hex
(to specify unit numbers 0 to 95)
CPU Bus Unit: 8000 to 800F hex
(to specify unit numbers 0 to F hex)
D+1: Number of words to transfer
(0001 to 0080 hex, depends on Special I/O Unit or CPU Bus Unit)
Operand Specifications
Description IOWR(223) writes the designated number of words (D) from the first source
word (designated by S) onwards and outputs them to the Special I/O Unit or
CPU Bus Unit that has the unit number designated by D.
D+1
D
D+1: Leftmost 4 digits
D: Ri
its
Area C S D
CIO Area CIO 0 to CIO 6143 CIO 0 to
CIO 6142
Work Area W0 to W511 W0 to W510
Holding Bit Area H0 to H511 H0 to H510
Auxiliary Bit Area A0 to A959 A0 to A958
Timer Area T0000 to T4095 T0000 to T4094
Counter Area C0000 to C4095 C0000 to C4094
DM Area D0 to D32767 D0 to D32766
Indirect DM addresses
in binary
@ D0 to @ D32767
Indirect DM addresses
in BCD
*D0 to *D32767
Constants #0000 to #FFFF (binary) Specified values
only
Data Registers DR0 to DR15 --- ---
Index Registers ---
Indirect addressing
using Index Registers
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
D
D+1
Desig-
nated
number of
words
written.
Unit number of Special I/O Unit or CPU Bus Unit
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