
102
IOWR/IORD Instruction Specifications
Section 6-5
Note
SR Area addresses for the C200HX/HG/HE, C200H, and C200HS are given
in parentheses.
6-5-2
IORD Instruction (SPECIAL I/O UNIT READ)
There are two methods of using the IORD instruction for the ASCII Unit as fol-
lows:
Reading from ASCII Unit Variables
Less Than Flag
(LE) (25507)
---
---
Overflow Flag
(OF) (25404)
---
---
Underflow Flag
(UF) (25405)
---
---
Negative Flag
(N) (25402)
---
---
Value
(see note)
ON
OFF
C: Control code
S: Source Unit No., No. of transfer words
D: First destination word
IORD
C
S
D
Value (4-digit
hex.)
C:
Details
Combination
#FD00
Transfers from the ASCII Unit's variable to the
words specified in the allocated IR/CIO area
words IR/CIO n + 8 and IR/CIO n + 9.
Must be used in combination
with the ASCII Unit's PC
QWRITE@ command.
S:
15
12 11
0
Unit No. of the ASCII Unit (0 to F).
No. of transfer words (001 to 128 from IR/CIO n + 8) from the ASCII Unit to
the CPU Unit.
C200HX/HG/HE
Содержание C200H-ASC11
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