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Path: ...!news.misty.com!weretis.net!feeder9.news.weretis.net!i2pn.org!i2pn2.org!.POSTED!not-for-mail From: mitchalsup@aol.com (MitchAlsup1) Newsgroups: comp.arch Subject: Re: ancient OS history, ARM is sort of channeling the IBM 360 Date: Thu, 27 Jun 2024 17:39:46 +0000 Organization: Rocksolid Light Message-ID: <3ac7a1edcf37289f8252503ef3cabe7a@www.novabbs.org> References: <s7r87j1c3u6mim0db3ccbdvknvtjr4anu3@4ax.com> <v5gagi$20gjg$1@dont-email.me> <v5hema$2g2i$2@gal.iecc.com> <v5i0qp$2avln$2@dont-email.me> <v5ifud$tlq$1@gal.iecc.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Info: i2pn2.org; logging-data="1380774"; mail-complaints-to="usenet@i2pn2.org"; posting-account="65wTazMNTleAJDh/pRqmKE7ADni/0wesT78+pyiDW8A"; User-Agent: Rocksolid Light X-Rslight-Site: $2y$10$ex9Ef/dU097A.c5T8E5LoeNjXzBYz3NCJaJg8q4tgvP/mTlO0riLi X-Spam-Checker-Version: SpamAssassin 4.0.0 X-Rslight-Posting-User: ac58ceb75ea22753186dae54d967fed894c3dce8 Bytes: 2425 Lines: 34 John Levine wrote: > According to Lawrence D'Oliveiro <ldo@nz.invalid>: >>>>possible to request “locate mode”, ... >>>>* It only works for reads, not for writes >>> >>> It works fine for writes on IBM systems. PL/I even has a LOCATE >>> statement to get a buffer to write into. >> >>I found this manual >><http://bitsavers.trailing-edge.com/pdf/ibm/360/tss/GC28-2045-1_Time_Sharing_System_PLI_Language_Reference_Manual.pdf>. >>On page 96, it says >> >> The LOCATE Statement >> -------------------- >> ... >>So it has its own limitations on applicability. For example, it only >>seems to work for writes, not reads. > Well, yeah. Keep reading and on page 97 you'll find the SET option > which is how a you get the pointer for a locate mode READ. It was more > common when defining based data to say in the declaration what the > default pointer to the data was, so if you said to READ or LOCATE the > item, it'd automatically set the pointer. > That TSS manual is rather estoteric since hardly anyone ever used TSS > and even those of use who did, didn't write much PL/I. I did; TSS 360/67 CMU, and I did; both PL/C and PL/1. > Here's the regular PL/I manual which explains locate mode for > reading and writing on page 168. > https://bitsavers.org/pdf/ibm/360/pli/C28-8201-1_PLIrefMan_Jan69.pdf