From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,ce6f6f23c4e880ad X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2002-06-24 21:49:13 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!newsfeed.icl.net!newspeer.clara.net!news.clara.net!news-lond.gip.net!news.gsl.net!gip.net!news.tele.dk!small.news.tele.dk!207.115.63.138!newscon04.news.prodigy.com!newsmst01.news.prodigy.com!prodigy.com!postmaster.news.prodigy.com!newssvr13.news.prodigy.com.POSTED!3bae8248!not-for-mail From: tmoran@acm.org Newsgroups: comp.lang.ada Subject: Re: Multitasking theory question References: X-Newsreader: Tom's custom newsreader Message-ID: NNTP-Posting-Host: 67.115.107.67 X-Complaints-To: abuse@prodigy.net X-Trace: newssvr13.news.prodigy.com 1024980534 ST000 67.115.107.67 (Tue, 25 Jun 2002 00:48:54 EDT) NNTP-Posting-Date: Tue, 25 Jun 2002 00:48:54 EDT Organization: Prodigy Internet http://www.prodigy.com X-UserInfo1: [[PAPDONAJUMB_LY@BCBNWX@RJ_XPDLMN@GZ_GYO^BVNDQUBLNTC@AWZWDXZXQ[K\FFSKCVM@F_N_DOBWVWG__LG@VVOIPLIGX\\BU_B@\P\PFX\B[APHTWAHDCKJF^NHD[YJAZMCY_CWG[SX\Y]^KC\HSZRWSWKGAY_PC[BQ[BXAS\F\\@DMTLFZFUE@\VL Date: Tue, 25 Jun 2002 04:48:54 GMT Xref: archiver1.google.com comp.lang.ada:26687 Date: 2002-06-25T04:48:54+00:00 List-Id: > [Meridian Ada for DOS] Unfortunatly, the system was limited to just 15 > concurrent tasks. I'm confused here. Did Meridian do 15 or whatever tasks preemptively, or non-preemptively? As to DOS, IIRC there were system calls explicitly to allow you to run while a system call was blocking its caller. And device drivers were written with an interrupt driven part and a part callable from the app, so there was at least a nod toward multitasking.