ClearPath OS 2200 Series Release 13.2 Software Planning and ...

Customer BDIs
D.4. Customer BDIs
Basic mode programs use 12 bits to specify a BDI, for a maximum of 4095 BDIs, while
extended mode programs use 15 bits, for a maximum of 32767. Thus, the first 4095
BDIs might be used by basic or extended mode programs, but the rest are only available
to extended mode.
Within the 3121 fixed BDIs defined by MAXBDI, 2255 are reserved for specific Unisys
products and 866 are reserved for customer use. All 3121 fixed BDIs fall within the first
4095 BDIs.
The set of customer BDIs is defined as the following:
0300 - 0323
0400 - 0411
0500 - 0511
...
then the first 10 (12 octal) from each
100 octal through 03100
03100 - 03111
03200 - 03777
05500 - 05777
06000 - 06061
...
In addition, the following BDIs are reserved for customers:
04600 - 04607
04700 - 04707
05100 - 05107
05200 - 05207
05300 - 05307
05400 - 05407
Note: BDIs are always denoted by octal numbers. BDIs are also often concatenated
with the address tree level indicator and displayed as 18-bit numbers. For example,
application level BDI 0300 might be referred to as 0400300 in basic mode and 0200300
in extended mode.
Caution
When creating local common banks and subsystems, it is important to use
only the customer set of BDIs. Local common banks include additional copies
of standard Unisys products, such as UDS, MCB, and so forth, which might
be installed in the same system, as would be the case with multiple
application groups. Doing otherwise is highly discouraged as it creates the
potential for conflicts with future standard Unisys products.
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