DIAGNOSE Code X'20' -- General
I/O
Input/
Output operations to the terminal and printer devices
can be performed from a virtual machine using Diagnose
020. No interrupts are returned to the virtual machine; the
instruction completes only when the read or write operation
has completed. Rx contains the virtual device address; Ry
points to the following CCWs:
Dasd: Same as Diagnose 18, except
that
the
data
transfer
length need not be a mUltiple
of
512
bytes.
Terminal control:
X'03'
,data,O,control, 1
Terminal write:
X'09'
,data,O,len
Terminal read: X'Oa' ,data,O,len
Printer write - Local printer:
X
103
I ,
data,
CC
, 1
X
'
08
1
,data,CC,1
X
'
01
1
,data,CC,
len
X
'
09
1
,data,CC,len
X I
11
I
,data,
CC,
I en
X
119
I
,data
,CC, len
x
'
89
1
,data,CC,len
X'Ob
'
,data,CC,
1
X
'
13
1
,data,CC,1
X'1b
'
,data,CC,
1
x
'
8b
'
,data,CC,
1
NOP
TIC
Print,
no
space
Print,
space
1
Print,
space
2
Print,
space
3
Print,
skip
to
top
of
page
Space 1
Space 2
Space 3
Skip
to
top
of
page
Printer write - Remote Spool: Any valid
CCW
chain
Where:
len
is
the length of the data area.
For
the terminal input and
local printer output, the maximum length is 132.
control
control flags
X'80'
quiet mode command control - used to replace
RUNNING
display status with WAITING.
A-14
VM/PC
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