Path: csiph.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: Bob Eager Newsgroups: alt.folklore.computers,comp.sys.raspberry-pi Subject: Re: self-modifying code, Is it a lost cause? Date: 5 Jul 2016 18:33:36 GMT Lines: 30 Message-ID: References: <20160704064342.d9f389159695423441ca84c6@eircom.net> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Trace: individual.net N1RUhv9gSM+46C6pdAu6AgrJtfxCbxn2N7C6DJxN669fIn/wIB Cancel-Lock: sha1:73CEM9tjG1cpIgL1TMo7Q8noV+s= User-Agent: Pan/0.139 (Sexual Chocolate; GIT bf56508 git://git.gnome.org/pan2) Xref: csiph.com alt.folklore.computers:166695 comp.sys.raspberry-pi:12543 On Tue, 05 Jul 2016 17:54:58 +0000, Martin Gregorie wrote: > On Tue, 05 Jul 2016 15:42:45 +0000, Bob Eager wrote: > >> The second generation was the S-series, with a much simplified layout. >> The controllers were all different, I believe. >> > The last 2900 I used were the Beeb's 2966s. Initially they were running > CME because there was still some live 1900 code awaiting replacement/ > conversion. That needed two OPERs - one for G3 and one for VME/B. The > stuff I did there all involved COBOL + IDMSX databases. > > BTW, one of the visiting gurus told us that the microcode was all > running on a 2MHz 6809. I imagine that drove a fairly impressive set of > hardware prosthetics but even so it does explain the quoted PLI > execution speeds. I find that hard to believe, but perhaps it's true. I'll ask the guys who are restoring a 2966. I never used VME/B. I did use VME/K for three years, until we dumped it for a home grown operating system. -- Using UNIX since v6 (1975)... Use the BIG mirror service in the UK: http://www.mirrorservice.org