I'm wondering when 5 byte UCBs came into service and where this data comes from.
UCBCHAN in a z/OS 1.12 and 13 system's MODGEN still shows as 2 bytes.
How do you get 5 hex characters represented out of 2 bytes?

D IPLINFO
IEE254I  18.36.23 IPLINFO DISPLAY
SYSTEM IPLED AT 17.34.39 ON 01/10/2012
RELEASE z/OS 01.12.00    LICENSE = z/OS
USED LOAD00 IN SYS1.IPLPARM ON 02020
ARCHLVL = 2   MTLSHARE = N
IEASYM LIST = 00
IEASYS LIST = (00,01) (OP)
IODF DEVICE: ORIGINAL(02020) CURRENT(02020)
IPL DEVICE: ORIGINAL(03100) CURRENT(03100) VOLUME(SCARS1)

I've looked at the IEE254I message in the doc but it just says...
"The device number of the volume where the I/O configuration ..."

The "D U" command still only shows 4 bytes.

Any ideas?

Dan

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