User`s guide

Data Structures and Memory Layout
C.2 Restart Parameter Block
Table C–2 (Cont.) Restart Parameter Block Fields
(R11)+ Field Name Description
Note
1. For VAX/OpenVMS, the RPB$T_FILE must contain the root directory
string "SYSn." on a non-network bootstrap. This string is parsed by
SYSBOOT (SYSBOOT does not use the high nibble of BOOTR5).
2. The RPB$T_FILE is overwritten to contain the boot node name for
compatibility with ELN VX.X (this field is only initialized this way when
performing a network boot).
90: RPB$B_CONFREG Array (16 bytes) of adapter types
(NDT$_UB0 - UNIBUS).
A0: RPB$B_HDRPGCNT Count of header pages.
A1: RPB$W_BOOTNDT Boot adapter nexus device type. Used by
SYSBOOT and INIADP (OF SYSLOA) to
configure the adapter of the boot device
(changed from a byte to a word field in Version
12 of VMB).
B0: RPB$L_SCBB Physical address of SCB.
BC: RPB$L_MEMDSC Count of pages in physical memory including
both good and bad pages. The high 8 bits
of this longword contain the TR #, which is
always 0 for KA52.
C0: RPB$L_MEMDSC+4 PFN of the first page of memory. This field is
always 0 for KA52/53, even if page #0 is a bad
page.
Note
No other memory descriptors are used.
104: RPB$L_BADPGS Count of "bad" pages of physical memory.
(continued on next page)
C–8 Data Structures and Memory Layout