Look in the MVS 3.7 manual on Bitsavers. GC28-0681-2 OS/VS2 SPL Initialization and Tuning?Guide.? Even though it says 3.7, that's when the parameter was added, and will be applicable for MVS 3.8.
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I don't know what the I/O appendage module's name is, but it's probably in the DL1 program library as IGG019xx, where xx is the appendage name to be specified in IEAAPP00.? The module itself probably needs to be copied to SYS1.LPALIB, or perhaps SYS1.SVCLIB.
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The DL1 manual probably specifies which appendage the module is for (SIOAPP, EOEAPP, PCIAPP, CHEAP, ABEAPP).
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Create an IEAAPP00 member with the format of?
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appendage type? ?suffix
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so, ab example is?
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SIOAPP? ?WA,W1
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which would load startI/O appendages as IGG019WA and IGG019W1.
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I don't think anything is needed in IEASYSxx.
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I also doubt that? RAKF has anything to do with this.? An authorized module means that it resides in an authorized library (LPALIB and SVCLIB are both authorized) and the module was linked as AC=1.