Page of GC20-1801-10 As Updated April 1, 1981 by TNL GN25-0837 RDEVICE Macro The RDEVICE macro instruction generates an entry in a table of
programmable communications controllers when DEVTYPE=3704 or 3705 is
specified. This table can have a maximum of 10 entries; the following
message results if more than ten 3704 or 3705 devices are specified: MORE THAN 10 TP CONCENTRATORS If this message prints, it indicates that the RDEVBLOK is generated, but
no entry is made in the programmable Communications controller table.
The RCTLUNIT macro generates an RCUBLOK containing an index to each of
sixteen possible devices. When AITCU is specified, both the primary and
alternate RCUBLOKS contain an index to the same RDEVBLOK. The following MNOTE is issued when an RDEVICE macro specifying the ALTCU operand is
defined and an RDEVICE macro is also defined for a device with the
alternate control unit address: CONTROL UNIT TABLE FOR raddr1 IN USE by raddr2
For example RDEVICE ADDRESS=140,ALTCU=150 RDEVICE ADDRESS=150 RCTLUNIT ADDRESS=140 RCTLUNIT ADDRESS=150 RCHANNEL Device 140 is defined with a primary control unit address of 150 and
an alternate control unit address of 150. The ALTCU=150 specification
indicates that the 150 RCUBIOK will contain an index to the 150 RDEVBLOK. In this example, a RDEVICE macro also appears for device 150. A conflict arises since the RCUBIOK index for control unit 150 cannot
index to both RDEVBLOK 140 and RDEVBLOK 150. In the above example, the
user must remove the 150 RDEVICE macro to resolve the conflict. Specifying the FEATURE=(2CHANSW/4CHANSW) option on the RDEVICE macro to
indicate whether the hardware will support reserve/release CCWs is
unnecessary. DMKCPI makes an accurate and dynamic determination by
issuing a release CCW to the tape or count-key-data DASD devices. If
the hardware supports the Two-or Four-Channel Switch Feature, the
FTRRSRL bit is turned on in the RDEVFTR field. The FEATURE=(2CHANSW/4CHANSW) option on the RDEVICE macro is ignored since
determination is made by the initialization routine. For compatibility
reasons, the FEATURE=(2CHANSW/4CHANSW) operand is still allowed, but
when specified, causes the following MNOTE to be issued: {
2CHANSW}
4CHANSW FEATURE IGNORED Part 2. Defining Your VM/370 System 150.1
tifJLJ.J. I, 150.2 IBM VM/370 Planninq and System Generation Guide
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