Article 4765 of alt.sys.pdp10: Path: news3.best.com!news2.best.com!news.maxwell.syr.edu!newspeer.monmouth.com!news.ultranet.com!not-for-mail From: "Carl R. Friend" Newsgroups: alt.folklore.computers,alt.sys.pdp10 Subject: Re: YKYBHTLW Date: Thu, 22 Apr 1999 12:00:38 -0400 Organization: as little as possible! Lines: 27 Message-ID: <371F47A6.B8D17E18@stoneweb.com> References: <160419991655286030%drissman@acm.org> <7f9rhv$al3$3@ligarius.ultra.net> <3719f951.76285607@news.cadvision.com> <7fgd03$3sv$1@nntpd.lkg.dec.com> <371E7EB5.8123AF06@stoneweb.com> <7fn7kh$g42@nnrp4.farm.idt.net> NNTP-Posting-Host: zephyr.ultranet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Complaints-To: abuse@ultra.net X-Ultra-Time: 22 Apr 1999 16:00:40 GMT X-Mailer: Mozilla 4.5 [en] (X11; I; Linux 2.0.29 i586) X-Accept-Language: en Xref: news3.best.com alt.folklore.computers:128544 alt.sys.pdp10:4765 Chris Ward wrote: > > I may be wrong, but the first 16 words on the KA may have been core > memory (which was persistant across powerups) and was "hidden" by the > fast memory accumulators and the contents persisted (like ROM!) > across powerups. Your memory is correct, but only for the KA. "Fast Memory" was not switchable in KIs and later. On a KA with the FM (No, not _that_ FM) switched off, the ACs, indeed, were in core. There was a penalty in performance, of course. As far as I'm aware, FM was a _very_ popular option in the KA and not too many shipped without it. > It has been 20 years since I operated a 10, but I do remember you > could key in a bootstrap from the front panel switches. For devices which didn't support READIN-mode, you pretty much had to enter the bootstrap from the panel. However, most devices tended to be compatible with the READIN convention. -- +------------------------------------------------+---------------------+ | Carl Richard Friend (UNIX Sysadmin) | West Boylston | | Minicomputer Collector / Enthusiast | Massachusetts, USA | | mailto:crfriend@ma.ultranet.com | | | http://www.ultranet.com/~crfriend/museum | ICBM: N42:22 W71:47 | +------------------------------------------------+---------------------+ Article 4767 of alt.sys.pdp10: Path: news3.best.com!news2.best.com!feed1.news.rcn.net!rcn!news.ultranet.com!not-for-mail From: "Alan H. Martin" Newsgroups: alt.folklore.computers,alt.sys.pdp10 Subject: Re: YKYBHTLW Date: Fri, 23 Apr 1999 01:06:23 -0400 Organization: UltraNet Communications , an RCN Company http://www.ultranet.com/ Lines: 26 Message-ID: <371FFFCF.91181191@MA.UltraNet.Com> References: <160419991655286030%drissman@acm.org> <7f9rhv$al3$3@ligarius.ultra.net> <3719f951.76285607@news.cadvision.com> <7fgd03$3sv$1@nntpd.lkg.dec.com> <371E7EB5.8123AF06@stoneweb.com> <7fn7kh$g42@nnrp4.farm.idt.net> <371F47A6.B8D17E18@stoneweb.com> NNTP-Posting-Host: 207-172-255-163.s163.tnt2.sbo.ma.dialup.rcn.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Complaints-To: abuse@ultra.net X-Ultra-Time: 23 Apr 1999 05:06:52 GMT X-Mailer: Mozilla 4.5 [en] (Win95; U) X-Accept-Language: en,en-US,en-GB,es Xref: news3.best.com alt.folklore.computers:128598 alt.sys.pdp10:4767 "Carl R. Friend" wrote: > > Chris Ward wrote: > > > > I may be wrong, but the first 16 words on the KA may have been core > > memory (which was persistant across powerups) and was "hidden" by the > > fast memory accumulators and the contents persisted (like ROM!) > > across powerups. > > Your memory is correct, but only for the KA. "Fast Memory" was not > switchable in KIs and later. On a KA with the FM (No, not _that_ FM) > switched off, the ACs, indeed, were in core. ... The KA which Chris used (#101) once had an intermittent in the FM ENB switch, causing the hardware ACs to be randomly switched in and out as the margin check/maintenance panel vibrated (or was tapped by the field servant). When the Computer Museum was selling off PDP-6 boards at the MR cafeteria garage sale, I asked Gordon if read-in mode was implemented as a diode matrix, and if so, could he direct me to that board. He said it wasn't, and that I really wanted an AR/MQ/MB/lamp driver(Memory Indicator?) S6205K arithmetic register bit slice instead. /AHM -- Alan Howard Martin AMartin@MA.UltraNet.Com