IBM System/370-XA (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "IBM System/370-XA" in English language version.

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bitsavers.org (Global: 4,153^rd place; English: 2,291^st place)

IBM System/370 Extended Architecture Principles of Operation (PDF) (First ed.). IBM. March 1983. SA22-7085-0.
See MVS/Extended Architecture System Programming Library: 31-Bit Addressing (PDF) (Second ed.). IBM. January 1984. GC28-1158-1., for extensive examples of the use of BAS, BASR, BASSM and BSM, in particular, pp. 29–30.
IBM System/370 Principles of Operation (PDF) (Eleventh ed.). IBM. September 1987. p. 3-26. A22-7000-10.

A. Padegs (May 1983). "System/370 Extended Architecture: design considerations". IBM Journal of Research & Development. 27 (3). IBM: 198–205. doi:10.1147/rd.273.0198.

"IBM 3081 PROCESSOR COMPLEX MODELS K16, K24, K32. - NEW SYSTEM/370 EXTENDED ARCHITECTURE (370-XA) ADDED TO 3081". Announcement letters. IBM. October 21, 1981. ZG81-0263. Retrieved August 6, 2025. All models of the 3081 Processor Complex will be capable of two modes of operation starting April 1983.
"WAIT — Wait for one or more events". z/OS MVS Programming: Authorized Assembler Services Reference, Volume 4. IBM. ... the high order bit in the last fullword must be set to one to indicate the end of the list.
"Using the BASSM and BSM instructions". z/OS MVS Programming: Assembler Services Guide. IBM.