l!SSCOl! MSSCOM contains information necessary to request a l!SS volume mount, request a MSS volume
demount, or ccmplete processing when a pack change interrupt is received on a l!SS device.
The MSSCOM tlocks are chained frcm location in module D!KSSS. 0 8 10 18 20 Hexadecimal Displacement ------------ 0 6
8 C 10 14
18 1C 24
r I HSSSER I I////////MSSRSRVD/////////I I I MSSTASK2 I I MSSNEXT I I HSSUSER (cont.)
Field
Name MSSSER DS CL6 MSSVUA DS XL2 MSSRSRVD DS 1F HSSTASK1 DS 1F MSSTASK2 DS 1F MSSTASK3 DS 1F MSSNEXT DS 1F MSSUSER DS CLS MSSFLAGS DS X12 in MSSFLAGS MOUNT EQU -X'8000'- EQU X'2000' MSSERR EQU X'400' RQENT EQU X'SO' MQENT EQU X'40' INPROC EQU X'20' aSGPROC EQU X'10' 8SSVUA MSSTASK1 MSSTASK3 aSSUSEB MSSFLAGS Field Description, Contents, Meaning Volume serial number of the l!SS volume
to te mounted or demounted Device address for the volume
Beserved for IBl! use
Pointer to a CPEXBLOK for a pending pack change interrupt
Pointer to a CPEXBLOK for a pending MSC return on mount or demount
Pointer to a CPEXBLOK for an I/C request to a volume being mounted Next entry in the chain, or zere
Name of the virtual aachine that requires the activity
Einary flags representing the
status of the request Mount volume aSSSER on address HSSVUA Demount MSSSER from MSSVUA The l!SC detected an error while
attempting the requested action
This request is waiting to be passed
to the l!SC This request has been passed to the l!SC, and is awaiting a pack change
interrupt
This request being processed by the l!SC The esc has completed for this request
and message DMKSSS0881 is being sent MSSSIZE EQU (*-MSSSER)/8 asscoa size in doublewords Section 1. CP Data Areas and centrel Elocks 59

NCPTBL
NCPTBL entries provide description information en 370x control program images saved en
Cp-owned volumes. 0 8 10 18
Hexadecimal
Displacement
------------ 0 4
8 10 16 17 18 lC I ICPPIT NCPSIZE ! I NCPNAftE I I NCPVOL 1*1 1//U*2///1 I NCPSTART NCPPAGCT I Field lame NCPPNT DS NCPSIZE DS NCPIAftE DS NCPVOL DS NCPFLAG DS !!it§ NCPTNCP EQU NCPTCEP EQU NCPTPEP EQU NCPRSV1 DS NCPSTART DS NCPPAGCT DS NCPSIZE EQU lF IF CL8
CL6 lX !1! X'Ol' X'02' X'03' 1X IF IF Field Description, Contents, Displacement to next entry 370x storage size required for load
Control program reference name Volume identification of DASt containing
saved image N*l CPTYPE flag hyte
Netwcrk Control Program 270x Emulation Control Prograa
Partitioned Emulation prograa N*2 f6t use
Pointer to first page (CCPt) cn HCPveL of
saved NCP Total number of pages saved
(*-NCPSIZE)/8 NCPTEL size in doutlewords (X'04') 60 IBft VM/370 Data Areas and Control Block Logic