Path: utzoo!mnetor!uunet!unisoft!hoptoad!dasys1!pechter From: pechter@dasys1.UUCP (Bill Pechter) Newsgroups: comp.sys.dec Subject: Re: pdp questions... Message-ID: <2713@dasys1.UUCP> Date: 25 Jan 88 02:01:46 GMT References: <16886@gatech.edu> <5168X@utah-cs.UUCP> Reply-To: pechter@dasys1.UUCP (Bill Pechter) Organization: Datamerica Systems, NYC Lines: 45 In article <5168X@utah-cs.UUCP> cetron@cs.utah.edu.UUCP (Edward J Cetron) writes: >In article <16886@gatech.edu> ken@gatech.edu (Ken Seefried iii) writes: >>the 11/23, 11/23+ and 11/24... > same chip set, (t-11 i seem to recall) but 23+ had some outboard > slu's etc unlike the 23. the 23/23+ where q-bus, the 11/24 used > a similar (but NOT identical) chip set and was unibus > I believe the F11 chips on the 11/23 11/23+ and 11/24 were identical. >>the 11/44 and 11/45... > the 11/45 was a cache-less 11/70, old chip set. 11/44 was much newer > and used the same type of dual bus (processor-memory vs unibus) as the > 11/70 but only had 1 set of registers unlike the 11/70... > (it also took LOTS less power) The KB11-A and KB11-B were the early 11/45 and 11/70 respectively. They were very similar, having separate I and D space, but the 11/70 had 22 bit addressing and a unibus map. The floating point units were the same as well. The 11/70 was later upgraded to the KB11-C and the 11/45 was the KB11-D after equivalent ECO's were performed. I seem to remember that a major reason for the ECO's was a floating point bug found under Unix systems. The 11/70's main feature was the cache memory, integrated cache-memory to main memory to RH70 massbuss which replaced the RH11 option by integrating the RH into the CPU's backplane. The 11/45 had dual registers (I think) as well as the 11/70. The 11/45,11/50 and 11/55 were the same machine with different memory configurations. The 11/55 was a screamer using bipolar memory and core giving very fast speed. I think the 11/55 was the one with the later floating point option on it. I won't go into the ones that never hit the street. >>the 11/70, 11/73 and 11/84/83... > and in most (but not all) circumstances are the fastest 11's around >('cept those fascinating rumors of 40Mhz j-11's running in liquid nitrogen >......) How about the rumors of the parallel multi-processor j-11's in the labs at DEC and in DECUS? Bill Pechter ex-DEC Field Service -- Bill Pechter {sun!hoptoad,cmcl2!phri}!dasys1!pechter Lakewood Microsystems, 103 Governors Road, Lakewood NJ 08701 (201)370-0709 Evenings Big Electric Cat Public Access Unix, New York, NY