IBM Professional Series User Manual page 353

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 Users Guide