test-drb January 2006

test-drb@ccmp.vtda.org

240 participants
511 discussions

by pete＠dunnington.plus.com

On Jan 5 2006, 0:53, Pete Turnbull wrote: > On Jan 4 2006, 10:56, Richard wrote: > > Mine is labelled "AUX On/Off" and I didn't know what it did. > > > > On the 861 power conditioner there is a connector labelled J2. Is > > this where the switch connects up? > > If it's a 3-pin AMP Commercial Mate-N-Lock, then yes it's the power > control bus. I should have added: There's a fairly good picture at http://www.dunnington.u-net.com/public/PDP-11/AMP-Mate-N-Lock3.jpg if you don't know what those connectors look like. The one on the left is the one that goes on each end of the control cable; the one on the right is the one you'll find on the 861, 871 or 874 controllers and the panel carrying the AUX switch. They are, incidentally, the same range of connectors used for the full-size 4-way power connector on disk drives and the like. -- Pete Peter Turnbull Network Manager University of York

18 years, 11 months

DEC 874-A Power Conditioner

by pete＠dunnington.plus.com

On Jan 4 2006, 10:56, Richard wrote: > In article <10601040813.ZM28391 at mindy.dunnington.plus.com>, > Pete Turnbull <pete at dunnington.plus.com> writes: > > There should be, on all BA11-M, BA11-N, and BA11-S boxes (except some > > expansion boxes that have no LED/switch panel at all) though depending > > on the box, it may be labelled LTC or AUX. Incidentally, on a BA23, the power control is brought out to the standard 3-pin Mate-N-Lock labelled J6, on the back of the chassis, at the left, near the IEC mains inlet. > Mine is labelled "AUX On/Off" and I didn't know what it did. > > On the 861 power conditioner there is a connector labelled J2. Is > this where the switch connects up? If it's a 3-pin AMP Commercial Mate-N-Lock, then yes it's the power control bus. There should be two connectors, actually, so you can daisy-chain cabinets/controllers. As Henk said in a separate reply, the controllers normally have only mains power outlets and two or three control sockets. On my 861Bs there are 8 mains outlets on the left, 4 on the right, and the ON/OFF/REMOTE switch is towards the right, with one unlabelled power control socket to the left of it, and two more to the right. On my 871Bs, on the smaller QBus cabinets, there are three pairs of mains outlets, with the ON/OFF/REMOTE switch just to the right of centre above one pair, and two power control connectors labelled J1 and J2 above the rightmost pair. -- Pete Peter Turnbull Network Manager University of York

18 years, 11 months

relay logic

by vlm＠mulhollon.com

Anyone have intermediate to advanced level advice on relay logic? When I was a kid, each relay would cost about one hour of labor, a cheap bench linear supply could only handle about 10 active relays, and fanout ratios were maybe only 5 to 1. Now according to my latest Mouser catalog, each relay will cost me about two minutes of labor, a cheap switching power supply will run hundreds of relays, and I can easily get a 10 to 1 fanout even with cheapie relays. I'm quite well aware of how to make basic gates, FF, counters etc out of relays but I'm curious about anyone elses experiences. I can contemplate all kinds of weird problems like mechanical shock from so many relays clicking at once, or the relay equivalent of contact bounce, but I don't know if they're real problems. Then there's mounting issues.

18 years, 11 months

Homebuilt TTL and transistor CPUs

by dwight.elvey＠amd.com

>From: "Roy J. Tellason" <rtellason at blazenet.net> > >On Wednesday 04 January 2006 09:31 am, J.C. Wren wrote: >> This fellow has some interesting projects. A 6502 opcode compatible >> CPU implemented in latches and EEPROMs. A NAND-gate based MC14500B. >> And a CPU using (mostly) only transistors. Also a introduction to >> microprogramming article, and some other good stuff. >> >> <URL: http://people.freenet.de/dieter.02/index.htm > >> >> I don't know if anyone else mentioned this page in the past. I >> don't recall it, and I tend to follow the homebuilt CPU threads here. >> If you've seen it already, sorry about that. > >I wonder how fast you could get one of those to go...? > >-- >Member of the toughest, meanest, deadliest, most unrelenting -- and >ablest -- form of life in this section of space, a critter that can >be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters" >- >Information is more dangerous than cannon to a society ruled by lies. --James >M Dakin > Hi I suspect the limits are bus and speed of the EEPROM's. One can get EPROMs that are in the 50 to 60 ns someplace but getting data from normal random access memory can be an issue. Using one of the newer protocols, such as DDR would require a memory interface that was almost as complicated as the uP you were building. Still, there are a number of processor models that make sense for using slower memory. I've seen one that used a 20 bit data bus and most instructions were 5 bits. This means that 5 operations can be done on one instruction fetch. This doesn't work well with the typical RISC machine because you need operands. It does work with zero operand machines quite nicely :) Later Dwight

18 years, 11 months

Speaking of 6502s, was Re: 70's micros still available - was 1802 problems

by leeeedavison＠yahoo.co.uk

> the 68HC11 seems to be everywhere--and the 6502 has been pretty > much relegated to obscurity. The reason you don't see it is that the part number oftem bears no similarity to 65x02. All the Mitsubishi 740 series and ITT CCU3000 series ucontrollers were 6502 cored as are a lot of Rockwell modem chips. Every BSB D2MAC receiver had two 6502 chips, one in the CAM badged GEC, Sharp TVs and Videos used them. In non computing equipment the most popular CPU core seems to be the 8031/51, 6502 and Z8, Lee. .. ___________________________________________________________ NEW Yahoo! Cars - sell your car and browse thousands of new and used cars online! http://uk.cars.yahoo.com/

18 years, 11 months

DEC 874-A Power Conditioner

by oldcpu＠rogerwilco.org

Greetings to all, and here's to 2006! My first post, though I have skulked for months...still, consider me a PDP newbie... I've recently acquired a fully functional PDP-11/23plus with the idea that I'd re-acquaint myself with RSTS/E which happened to be the first system I was actually paid to program on. Trouble is, it was a short stint with this local VAR, and it was nearly 30 years ago! I don't even remember what the systems were exactly, though I think they were 11/40s. Stangely, these systems were in blue cabinets (did DEC ever do blue?), with none of the typical maroon or red PDP-11 signature color...that is until the LSI models started showing up in white, which is what I've got. Anyway, I'm now happily in the process of re-assembling the system and preparing for my first power up since getting it home. The configuration I have is in a double-wide 40" tall rack unit. Each rack or 'bay' between the three uprights has a 874-A power conditioner / power-strip unit that I'm trying to understand. I haven't been able to find any references to this component. Though I could just replicate the configuration that it had before being relocated (switches, wiring, etc.), which I have plenty of photos of, I'd like to understand this compenent better. Since I have a double-wide cabinet, I've got two of these units that are linked together with a 3-conductor cable, each end plugged into one of the four "Power Control Bus"-labeled sockets. One 874-A also has another connection from a second "PCB" socket to the the 11/23+ processor box. My guess is this line somehow is controlled by the front panel AUX ON/OFF switch. Also, each of the 874-A units has a small 3-position toggle switch: 'Remote On', 'Off', and 'Local On'. Before I go much further with experimenting on my own, I wonder if anyone here knows these units and can offer some info about how these units tie together and what settings do what. Comments? J.

18 years, 11 months

Homebuilt TTL and transistor CPUs

by dwight.elvey＠amd.com

Hi If it was some IP you bought or got from someone else, I don't think it would qualify. If you did the work your self, then it is valid. Think in terms of: I build my PC by plugging these cards in. versus: I build my cpu using FPGA for my alu and instruction decoder. I used my own MISC instruction set. later Dwight >From: "Chuck Guzis" <cclist at sydex.com> > >What qualifies a CPU as "homebuilt"? Would an FPGA implementation qualify >as one? If not, why not? If FPGA is disqualifed, how about CPLD/GAL/PAL? > >I'm just trying to understand the rules of this thing. > >Cheers, >Chuck > >

18 years, 11 months

Homebuilt TTL and transistor CPUs

by dwight.elvey＠amd.com

>From: "Chuck Guzis" <cclist at sydex.com> > >On 1/4/2006 at 11:29 AM Dwight Elvey wrote: > >> If it was some IP you bought or got from someone else, >>I don't think it would qualify. If you did the work your >>self, then it is valid. >> Think in terms of: >> I build my PC by plugging these cards in. >> versus: >> I build my cpu using FPGA for my alu and instruction >> decoder. I used my own MISC instruction set. > >Okay, so where does "I put together the logic (or used an FPGA) but >implemented someone else's instruction set (e.g. PDP-11, VAX, 6502, Z80, >etc.) fit in? > >Cheers, >Chuck > Hi I'd consider that to be home built. Just as the EPROM alu that he used on the 6502 was homebuilt. Still, it is much more fun to think about your own processor. Dwight

18 years, 11 months

RA60 packs available

by qed_computers＠yahoo.com

Dear Sir, Kindly send me your quote for the RA60 pack and the condition and quantity of these packs including delivery to Jordan. BEST WISHES Nader Qandah __________________________________________ Yahoo! DSL ? Something to write home about. Just $16.99/mo. or less. dsl.yahoo.com

18 years, 11 months

RT11 boot block 0 words ?

by henk.gooijen＠oce.com

I would like to use the vast knowledge of this community, as a brief search through the calssiccmp archive gave no answer ... I can't get RT11 booted anymore on my 11/34. To isolate the problem I have only one RL02 drive connected to the RL11. Before I start the M9312 monitor, I dumped 00005's in the memory locations 000000 thru 000070. Then I started the M9312 monitor (at 165020), and enter "DL" on the prompt. I loaded the RL02 cartridge, that I always use, first, of course. The READY lamp of the RL02 drive flashes briefly off/on once, and then the display on the 11/34 console shows (address) 000004, and the RUN lamp goes off. Examining the memory shows that location 000000 contains 000240, and all subsequent locations contain 000000. So the memory locations are written ... Is the first word (000240) the first word of block 0 of the RT11 bootstrap? I hesitate to load the XXDP RL02 cartridge that I have. I never made a copy (stupid, I know), and I am afraid to loose it ... thanks, - Henk, PA8PDP. This message and attachment(s) are intended solely for the use of the addressee and may contain information that is privileged, confidential or otherwise exempt from disclosure under applicable law. If you are not the intended recipient or agent thereof responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender immediately by telephone and with a "reply" message. Thank you for your cooperation.

18 years, 11 months

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test-drb January 2006