Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!news.mixmin.net!news.unit0.net!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: 4 Jul 2016 20:50:25 GMT Lines: 39 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 am1E2hvZz+Bf0mZpmTE+KAttcoEyAjIys3eOON/cR2UY9LS9Cf Cancel-Lock: sha1:I3rmXWp/SCPJ0Z0vZRqBr5xucrw= User-Agent: Pan/0.139 (Sexual Chocolate; GIT bf56508 git://git.gnome.org/pan2) Xref: csiph.com alt.folklore.computers:166522 comp.sys.raspberry-pi:12444 On Mon, 04 Jul 2016 15:20:13 -0400, J. Clarke wrote: > In article , tnp@invalid.invalid says... >> >> On 04/07/16 19:42, Bob Eager wrote: >> > On Mon, 04 Jul 2016 17:53:48 +0100, The Natural Philosopher wrote: >> > >> >> On 04/07/16 17:38, John Levine wrote: >> >>>> I think all processors have had the ability to load the contents >> >>>> of what a register points to. >> >>> >> >>> Nope, although I can believe all the ones built since you started >> >>> programming did. The PDP-8 I started programming on sure didn't. >> >>> If you wanted to do that, you had to store the accumulator into >> >>> memory and use that location as an indirect address. >> >> >> >> well so it could load a memory address pointed to by another memory >> >> addrres? Thats an index regsiter, just in RAM rather than in the >> >> CPU. >> > >> > You really don't like to be wrong, do you? Goalposts moving. >> > >> >> Makes sene when you built te CPU out of TTL. >> > >> > That CPU was not originally built out of TTL. >> >> So what was it built out of? > > Either transistors or DTL--I'm seeing two versions of the story. I think it was both, over time. But I can't find my Gordon Bell book. -- Using UNIX since v6 (1975)... Use the BIG mirror service in the UK: http://www.mirrorservice.org