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Q: What is OBJECT-COMPUTER paragraph?

Answer:
OBJECT-COMPUTER describes execution machine. OBJECT-COMPUTER. IBM-3090. MEMORY SIZE clause deprecated. PROGRAM COLLATING SEQUENCE for sort order. SEGMENT-LIMIT for overlay. Mostly documentation now; compiler usually ignores.
object-computer configuration machine
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Q: Explain RECFM options

Answer:
RECFM defines record format. F=fixed, V=variable, U=undefined. B=blocked, A=ASA control, M=machine control, S=spanned. Combinations: FB=fixed blocked, VBS=variable blocked spanned. Match program expectations.
recfm format dcb