TOPS-10 Monitor Calls Manual Volume 2 AA-K039D ... - Trailing-Edge

TAPOP. [CALLI 154]
22.168 TAPOP. [CALLI 154]
FUNCTION
Performs various magnetic tape operations. Several TAPOP. functions
are identical to or extensions of other monitor calls such as MTAPE
and MTCHR. All TAPOP. functions assume that the specified device has
been assigned to your job by the ASSIGN monitor command or the
OPEN/INIT monitor call or that the calling job has Spy privileges.
CALLING SEQUENCE
MOVE ac, [XWD len,addr]
TAPOP. ac,
error return
skip return
addr: EXP fncode
/ SIXBIT/device/ \
I EXP channo I
\ EXP udx /
first argument
last argument
In the calling sequence, the program supplies the following variables:
o
o
o
o
o
o
len is the length of the argument list.
addr is the address of the argument list.
fcncode is one of the function codes described below.
device is the SIXBIT physical or logical name of a device.
channo is the number of an initialized channel.
udx is the Universal Device Index for a device and the words
up through last argument are arguments for the given
function.
The function codes fall into four groups:
Codes
o - 777
1000 - 1777
2000 - 2777
Functions
Perform specific actions.
Read parameters.
Set parameters. These function codes are not
explicitly listed in the descriptions below. To set a
parameter, use the corresponding read function name
plus the offset .TFSET (=1000). For example, to set
the density indicator, use the read density indicator
mnemonic plus .TFSET:
.TFDEN+.TFSET
3000 - 3777
Reserved for customer-defined functions.
22-425