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Extended Mode Interface to SYSLIB
If the parameter is an address, it must be in the same bank as the packet generated by
the EM$BSPPKT PROC. All addresses are an 18-bit offset from zero.
The buffer for file table index (FTI) is contained in the packet generated by the
EM$BSPPKT PROC. The first word of the FTI is identified by the externalized label
EM$FTI. The value of EM$FTI is the offset from zero to the start of the FTI.
EM$BSP returns the status of the call to BSP$ in the packet field CALLSTAT. The
CALLSTAT field is S3 of word 2 of the packet (packet address + 1). The possible status
is
0 Normal return from BSP$
1 Error return from BSP$, error code in field A0SAVE
2 Illegal value given for the BSP$ function code
3 Illegal value given for the table type (TBLTYPE field)
For CALLSTAT codes 0 and 1, the contents of registers A0, A1, and A2 from BSP$ are
returned in packet fields A0SAVE, A1SAVE, and A2SAVE, respectively. These fields are
at words 3, 4, and 5 of the packet.
Packet Generation
The EM$BSPPKT PROC generates the packet for the Extended Mode interface to BSP$.
This packet is required for the EM$BSP PROC.
Calling Sequence:
label EM$BSPPKT buflen [,filename]
where:
buflen
The word length of the buffer used to hold the program file table. The length should
be 28*(5+4n), where n is a positive integer. The minimum length is 252 words. For
maximum efficiency, the buffer length should be large enough to contain the entire
table, including the size of entries to be added.
filename
The12-Fieldata-character internal file name of the file to be accessed (in quotes).
This parameter is optional; if omitted, the caller must place the internal file name at
location EM$FTI (an externalized label from this PROC).
The packet generated by the EM$BSPPKT PROC contains the buffers for the FTI and the
program file tables. It is not necessary to allocate additional space for them.
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