Texas Instruments 990 User Manual page 97

Applications Programming
Code Function
04 Request is made for the applications program
to be activated from an indefinite
suspension when input data from any station
is addressed to it. DXlO applications
programs that request this service can be
installed on any program file.
05 Request is made for the applications program
to be activated from a time delay when input
data from any station is addressed to it.
Applications programs that request this
service can be installed on any program file
in the DXlO system.
06 Request is made for the applications program
to be bid when input data from any station
is addressed to it. Applications programs
that request activation from termination, in
that they request to be bid, must be
installed in a DXlO program file named
.INDSCOMM.USERPROG and global LUNO >40 must
be assigned to the file. The bid task
service in TX5 is supported for resident
tasks only.
07 Request is made to remove the applications
program from the activation services list.
Byte 3 is reserved for use by the communications package.
The applications programs can use the activation services calls
as described in the following paragraphs.
4.2.2.2 Request Activation from Suspension - Opcode 4.
When input data addressed to the applications program is
anticipated on a regular yet unscheduled basis, the applications
program should execute an SVC with opcode >4D, I/O opcode 4.
After requesting this of activation services, the program should
request the operating system to suspend it indefinitely. When
any input data is addressed to it, activation services unsuspends
the program. After being unsuspended, control returns to the
program and it must execute a read call to retrieve the input
data addressed to it.
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