The Mainframe Pages: Reference Data – STIDP Breakdown
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The machine instruction STIDP (STore Processor ID) returns a doubleword, 16 hex digits, in the form of aabc cccc dddd eeee, where
a Identifies the machine model. A few of the possibilities are shown in Table 1, below.
b In basic mode, the CPU address for a central processor. In LPAR mode, it is the logical CPU address for a logical processor.
c In basic mode, this is a 5 digit serial number. In LPAR mode, it is 1 digit indicating the logical partition number, and a 4 digit serial number.
d The CPU model number, examples: 9021, 9121.
e Is all zeros.
Table 1: Some of the possibilities for machine model and the models they represent:
Hex
Model
28 9021-500
38 9021-580
39 9021-330
45 9021-620
49 9021-340
65 9021-720
7A 9672-RX5
A1 9672-520
A2 9021-640
A3 9021-740
A4 9021-820
A6 9021-900
B5 9021-860
B7 9021-660
C1 9021-711
C2 9021-821
D2 9021-822
C3 9021-831
C4 9021-941
D4 9021-942
D5 9021-952
D6 9021-962
D7 9021-972
D8 9021-982
DA 9021-9X2
F0 9121-311
F3 9121-411
F4 9121-511
F5 9121-521
F6 9121-621
F7 9121-622
F8 9121-732
F9 9121-742
FA 9121-522
FF a virtual machine guest under VM/ESA (or VM/SP or VM/XA)