MPE/iX Intrinsics Reference Manual (32650-90905)

Chapter 7 343
Command Definitions (HP32208-HPLOACNMPROC)
HPDEVCONTROL
200-character array before the call is made.
It also may be important to understand that the system converts this
parameter to a
pointer before passing it to the intrinsic. It should not be
coded as a pointer in the calling program, however.
itemnum 32-bit integer (required)
Specifies which operation is to be performed.
item 32-bit integer (required)
Itemnum/
Mnemonic Item Description
100/I32
Load Media:
Attempts to load the media (tape devices only).
101/I32 Online:
Programmatically places the peripheral online (tape
devices only).
This intrinsic is not supported for the following devices: 7974, 7976 and 7978A. If a call is
made against one of these devices an error is returned. Only item number 100 is supported
for the 7978B.
NOTE A call with an item number 100 (load) to a device which is already loaded is
acceptable (produces no harmful result). However a tape device would go
offline (only an HPIB DAT drive would not go offline). It is recommended that
this intrinsic be called with item 100 followed by 101 whenever it is used for a
tape device.
Related Information
None