Antonio Carlini via cctalk wrote: > On 12/10/17 21:10, Holm Tiffe via cctalk wrote: > > This thread is becoming a little confusing. The VAXstation II/RC was a > VAXstation II in a pedestal enclosure > and differed from a normal VAXstation II in only one way: some of the > backplane slots had glue in them. > (OK, two ways, since apparently DEC couldn't be bothered to build a > special backplane with fewer slots > but did think it made sense to produce a new badge with "/RC" on it :-)). > > It used a KA630 board just like any other VAXstation II. > > > > > As far as I remember there where some restrictions in the cache memory > > controller that prevented the use of virtual memory on that restricted > > KA620 CPU, not the CPU chip itself. > > Now the KA620 was a board that used a modified 78032 uV2 chip > (which I *think* might have been called the 78R32). It differed from > the 78032 in the way it handled page tables (and it may have differed in > other ways too). The intention was to ship something that simply could > not be supported by VMS. Since the limitation was in silicon, there was > nothing that a customer could do to get themselves a cheap VMS box. > The development effort presumably cost a bit more than bunging some > glue in a few backplane slots, but the ROI was probably greater too :-) > > > I have an ISA Card with a "VAX-Brick" on it, but that was a later > > Version with an ordinary CVAX, Cache, SCSI and Network inside w/o those > > restrictions. Usually that was meant to run VAXELN. > > The VAX Brick (or VAX 4000-50 iirc, that's fifty ... not a typo for five > hundred) was > a full VAX. It was supposed to be an upgrade for the VAX 4000-200. > It replaced the CPU and memory in the original system. > One of the few VAXes I'm pretty sure I've never seen in real life. > It was intended to run OpenVMS. I've no idea whether it also ran Ultrix. > > Antonio > > > -- > Antonio Carlini > arcarl...@iee.org
I meant that brick: http://www.tiffe.de/Robotron/PDP-VAX/VAX/rtVAX300-internal-3.jpg http://www.tiffe.de/Robotron/PDP-VAX/VAX/rtVAX300-internal-1.jpg http://www.tiffe.de/Robotron/PDP-VAX/VAX/rtVAX300-internal-12jpg on those boards: http://www.tiffe.de/Robotron/PDP-VAX/rtVAX300/rtVAX-ISA.jpg http://www.tiffe.de/Robotron/PDP-VAX/rtVAX300/rtVAX-VME.jpg which contains an CVAX. Regards, Holm -- Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe, Freiberger Straße 42, 09600 Oberschöna, USt-Id: DE253710583 i...@tsht.de Fax +49 3731 74200 Tel +49 3731 74222 Mobil: 0172 8790 741
