Path: csiph.com!usenet.pasdenom.info!news.albasani.net!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: Bob Eager Newsgroups: comp.misc,alt.sys.pdp11,alt.folklore.computers Subject: Re: Revamped PDP-11 in Brooklyn Date: 20 May 2014 13:50:20 GMT Lines: 41 Message-ID: References: <20140519154416.487cd031.rsw@therandymon.com> <20140520111048.ea712fde.rsw@therandymon.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Trace: individual.net osV0+NZ3Qh7zlfvR2dq8SAW6GKaRXWkO3MOo3i8UOwVdMFPo/Z Cancel-Lock: sha1:v5thjeAXts41eZW6P3cEHwpk3Zg= User-Agent: Pan/0.135 (Tomorrow I'll Wake Up and Scald Myself with Tea; GIT 30dc37b master) Xref: csiph.com comp.misc:2909 On Tue, 20 May 2014 11:56:56 +0000, Gordon Henderson wrote: >>LA 010000 DEP 012737 >> 000005 177404 000777 >>LA 010000 START WAIT 1 SEC LA 0000000 START . P4 >> >>Wizardry, total wizardry. I'm in awe. > > I used a PDP11/40 many years back when at uny. (~79/80) The boot > sequence was slightly easier - probably why its etched into my memory: > > 173000 LA (Load Address) > START > > and I'm pretty sure that was it. That's cheating. That would be the address of a ROM bootstrap progra. ROM was too expensive for many! Mind, the RK bootstrap was very short; a bus reset would zero cylinder, track and sector, then setting one bit would start the transfer. > And to think it supported 6 users running Unix in 256KB of Core memory > with a 3MB fixed drive and 1.5MB removable drives... I started on an 11/20 in 1972, running DOS/BATCH (although I made a ROLLIN image of RT-11FB that I used to use; I wrote a little print spooler for that). I managed to install Mini-UNIX on that 11/20 years later. I still have the manual. Our first UNIX system was a 112kB 11/40 with two 2.4MB RK05s, in July 1975. DECWriter, a few serial terminals, no tapes. -- Using UNIX since v6 (1975)... Use the BIG mirror service in the UK: http://www.mirrorservice.org