Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder4.news.weretis.net!usenet.ukfsn.org!not-for-mail From: Martin Gregorie Newsgroups: comp.lang.java.programmer Subject: Re: Java processors Date: Fri, 6 Jul 2012 22:29:55 +0000 (UTC) Organization: UK Free Software Network Lines: 39 Message-ID: References: <5f101d00-4bc9-4750-939c-cd53605bfa0e@googlegroups.com> NNTP-Posting-Host: 84.45.235.129 Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Trace: localhost.localdomain 1341613795 16312 84.45.235.129 (6 Jul 2012 22:29:55 GMT) X-Complaints-To: usenet@localhost.localdomain NNTP-Posting-Date: Fri, 6 Jul 2012 22:29:55 +0000 (UTC) User-Agent: Pan/0.135 (Tomorrow I'll Wake Up and Scald Myself with Tea; GIT 30dc37b master) Xref: csiph.com comp.lang.java.programmer:15850 On Fri, 06 Jul 2012 18:17:49 -0400, Eric Sosman wrote: > On 7/6/2012 5:18 PM, Martin Gregorie wrote: >> On Fri, 06 Jul 2012 13:53:21 -0700, Roedy Green wrote: >> >>> The underlying hardware had only 24 bits addressing, but it was bit >>> addressable. That let you address bytes with 21 bits, a mere 2 >>> megabytes.Yet that little machine pumped out transactions like you >>> would not believe. It used memory very cleverly dynamically balancing >>> system, >>> app, database, disk cache. >>> >> As I'm certain you know, driving 24x80 green screens allowed machines >> to use very much less memory than today's hardware with its >> memory-hungry high-resolution graphics. The BBC's pair of 2966s could >> each run 10-12 online IDMSX-based systems, which together were accessed >> by 300-400 terminals, yet each machine did all that with 16 MB of RAM. > > "MEGAbytes? Looxurry. Moi 'ole college campus 'ad a grand > total of 128 KILObytes,[*] an' we wuz glad to 'ave it, we wuz. But yew > troi tellin' the kids nawadays ..." > > [*] A couple decades ago it suddenly dawned on me that my > rather bare-bones video card had sixteen times the memory of my > college's mainframe. But yew troi tellin' the kids nawadays ... I wuz IMPRESSD by awl thet MEMORY in the 2966. The biggest 1900 I ever used, a 1904S, had 256 Kwords of core memory (24bit words). The one that taught me how to tune George 3 was a 1903S with 32 Kwords of core memory - the equivalent of either 96 kB (counting bits) or 128 KB (counting characters). The 1900 packed 4 6-bit ISO characters into a word. -- martin@ | Martin Gregorie gregorie. | Essex, UK org |