ED on command line z/os v1.8

What is the MVS job entry subsystem supported by IOF?
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: We have just brought up z/OS V1.8 on our TEST lpar. When entering the ED command on the command line after selecting a job, we are put into ISPF(Spiffy) edit. If ED is entered as a line command next to JCL it works correctly. Is this something that you know about relating to z/OS V1.8.

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