test-drb April 2013

test-drb@ccmp.vtda.org

205 participants
273 discussions

by elson＠pico-systems.com

Date: Fri, 5 Apr 2013 14:28:36 -0700 (PDT) From: Brian Roth <abacos_98 at yahoo.com> I did a quick look at the Eng drawings and while the power controller is 3 phase it looks like the fans are single phase. Not sure whats going on inside the power controller yet. I'll be tearing into this in a couple of weeks so if anyone has experience with the conversion, speak out. I know its been done. The power controller is REALLY simple, very much like the PDP-11 EPO controllers, just bigger. So, there is a voltage sent out on a 3-wire cable, and if you break two of the wires at the end of the chain, all units power off. The other wire powers up all units on the string. Just a little unregulated power supply and some relays. I think there's an airflow sensor in the blower plenums that breaks the EPO chain if a blower stops. Jon

11 years, 3 months

Did Dave Dunfield's cp/m archive on classiccmp.org go boom ?

by dave13＠dunfield.com

> >>> None of my links are working anymore. Just gives a 503 error. I > >>> need me some disk images. > >> Apparently no one has heard from Dave in a while. > > > > Oh man. Here we go again >MUCH more important, >Is Dave OK? Dave is alive and (mostly) well. Sorry Guys, I just don't have much time to participate in the list these days. I do browse through the threads every month or two using the web archive. I've not taken my site down - it is hosted on Classiccmp which does seem to be having a few problems as of late - today I am getting notices that "the site is unavailable due to maintenance or capacity" - I'm guessing the latter, because hit reload a couple of times and it will come up (I had the same issue reading the list). Regards, Dave -- dave12 (at) Dave Dunfield dunfield Firmware development services & tools: www.dunfield.com (dot) com Classic computers: http://www.classiccmp.org/dunfield/

11 years, 3 months

Amazing uptime...

by geneb＠deltasoft.com

6030 days ain't too shabby. :) http://arstechnica.com/civis/viewtopic.php?f=23&t=1199529 g. -- Proud owner of F-15C 80-0007 http://www.f15sim.com - The only one of its kind. http://www.diy-cockpits.org/coll - Go Collimated or Go Home. Some people collect things for a hobby. Geeks collect hobbies. ScarletDME - The red hot Data Management Environment A Multi-Value database for the masses, not the classes. http://www.scarletdme.org - Get it _today_!

11 years, 3 months

Amiga 4000/040 has been claimed

by sales＠elecplus.com

The Amiga 4000 has been claimed. Many thanks to all those who inquired! Cindy Croxton _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3272 / Virus Database: 3162/6226 - Release Date: 04/05/13

11 years, 3 months

World?s top supercomputer from ?09 is now obsolete, will be dismantled

by dm561＠torfree.net

----- Original Message ----- > Date: Wed, 3 Apr 2013 09:41:14 -0700 (PDT) > From: Fred Cisin <cisin at xenosoft.com> ... >> On Tue, Apr 02, 2013 at 02:31:39PM -0700, Fred Cisin wrote: >> > I'm having a little difficulty visualizing "The World's Top >> > Supercomputer" >> > as being a single chip CPU on a motherboard. >> > When did "supercomputers" become single board devices? >> > "Put the CPU on a daughterboard"? > > On Wed, 3 Apr 2013, Pontus Pihlgren wrote: >> Do you really think I'm that stupid? > > Of course not. I acknowledge and respect your expertise. > And, I certainly had no intention of offending you. ----- Reply:----- Yeah, come on, Fred; just because he doesn't seem to understand the concept of a *plural* morpheme and why using the singular to refer to hundreds of an item might cause confusion (especially in this context) doesn't mean he's stupid ;-) I thought that perhaps Swedish does not have such a concept but then I saw that he does speak of power supplieS and fanS; he even talks about making the CPU's pin compatible, although instead of multiple pins of multiple CPUs that seems to suggest making the (single) pin of a single CPU compatible with something... Fun with words, and of course as usual surprising and a little disappointing to see how ready and eager some people are instead to see insults or personal attacks in simple misunderstandings...

11 years, 3 months

Chip 733w01522 on xerox 820-II FDC controller. what is it?

by ard＠p850ug1.demon.co.uk

> > Is there anybody who knows what is this old chip? And where to try to find > it? I've seen 733Wxxx house codes on Xerox chips before, but hav never seen the equivalents list. > > If it help what I know is that it used to do somenting like shift data > register or Serial Shift Registers. > > It has a TTL level signal on its pins, it has 14 pins. You can see it named > U1 in the centre of this schematic: > <https://www.dropbox.com/s/zqhgar4g7ib5j4z/Xerox820_FDC_Schematic.pdf> > https://www.dropbox.com/s/zqhgar4g7ib5j4z/Xerox820_FDC_Schematic.pdf > > > > Some pins are labelled on a schematics with: > > 1=D1, 2=D2, 3=D3, 4=D4, > > 10=A1, 11=A2, 12=A3, 13=A4, 14=A4, > > 15=ChipEnable (left to GND), > > 7=GND, > > 14=+5Vcc Wait a second. You said jsut now it has 14 pins, and you give a signal for pin 15. Does it have a top cap or something :-) More seriousyl, if it's actually a 16 pin IC, I would guess it's a programmed 74x188 (open collector) or more likely 74x288 (3-state output) PROM. That's a 32*8 bit device that goes udner a variety of other numbers too, like 18S030. Fiffernt manufacturers had differnt programming algorithms, but the all work the same way in-circuit (in read mode). The pinout is : 1 : D0 2 : D1 3 : D2 4 : D3 5 : D4 6 : D5 7 : D6 8 : Gnd 9 : D7 10 : A0 11 : A1 12 : A2 13 : A3 14 : A4 15 : CE/ 16 : Vcc This could match your device, A4 is tied high (so only useing the second half of the ROM) and only the first 4 data lines are used. Of course the problem for you, I guess, is that a blank chip of the right type is of little use to you. You need to konw the contents (looks to be 16 4-bit words in your case). You could copy it from a working device fro the same type of machine, but other than that uou have some designing to do... -tony

11 years, 3 months

English spelling

by saquinn624＠aol.com

************************************** On Thu, 4 Apr 2013, Pontus Pihlgren wrote: > A little stupid.. I know about the rules for appending an S in the right place, I just > can't seem to master them. > > I thought that perhaps Swedish does not have such a concept but then > > I saw that he does speak of power supplieS and fanS; he even talks > > about making the CPU's pin compatible, although instead of multiple > > pins of multiple CPUs that seems to suggest making the (single) pin > > of a single CPU compatible with something... English has inconsistent rules, and freely breaks them. It seems to have more IRREGULAR conjugations, declensions, and plurals. Can anyone explain why the 'I' is after the 'E' in "WEIRD"? "I disconnected the speaker on all of the computers in the lab." does not imply that they share a speaker. Should I have said that I disconnected the "speakerS"? or maybe "the speaker on EACH computer"? And, in this particular example, "pin compatible" (or "pin-compatible") is a commonly used adjective that is not plural, no matter how many pins the device has. The object noun in the speaker sentence is the speaker, therefore if you disconnected more than one it would be "speakers" regardless of how many computers they were connected to. Same goes for the pin-compatible CPUs - the noun is the CPU, therefore pin remains singular (even though you're talking about multiple pins on multiple CPUs). Same logic that gives us "attorneys-general" and "gins and tonic" and a whole lot of confusion. As for weird, I just tell the students it's a weird word. Was it Bernard Shaw that threw away the rules he considered pointless and archaic? I know about cummings and capitalization, but that does little to make his poems easier to read or more comprehensible.

11 years, 3 months

RCA COSMAC Microkit

by billdeg＠degnanco.com

Here is an article about the Microkit that came out later in 1975: > > > Does anyone have a COSMAC Microkit user manual? I have downloaded the docs > > for the COSMAC chip from Bitsavers, but there is no reference to the > > earlier Microkit in this doc. > I believe its on the net but not there. There is a yahoo COSMAC users > group. They do not have the Microkit User Manual, but there not even be one. Found this reference to the Microkit, but it's nearly a year newer than my system chip dates, meaning they were still selling Microkits though 1975: http://bitsavers.trailing-edge.com/pdf/microcomputerAssociates/Microcomputer _Digest_v02n04_Oct75.pdf Bill

11 years, 3 months

DEC M7522 (RUX50) Unibus Quad-slot RX50 Controller

by pbirkel＠gmail.com

I've been trying to track down online documentation (manual, engineering drawings) for this Quad Unibus card, a controller for the RX50. No luck at all. Nada :-<. Just some references in RSX/RSTS/Ultrix marketing documents. Does anyone have, or know where such documentation can be found? Also, does anyone have (or knows someone who has) a spare/loose M7522 that they'd be willing to part with? Thanks! -----

11 years, 3 months

RCA COSMAC Microkit

by billdeg＠degnanco.com

http://www.vintagecomputer.net/RCA/COSMAC/ Photos of RCA COSMAC Microkit with 1801 card. Note the chip date of the TC 1085 on the processor card, which is the earlier version of the CDP 1801 (Microtutor), has a silk screen date of late 1974. Compare: http://www.vintagecomputer.net/RCA/COSMAC/RCA_GPA-3901822_front.jpg (Microkit) http://www.decodesystems.com/cosmac/mt5.jpg (Microtutor) Does anyone have a COSMAC Microkit user manual? I have downloaded the docs for the COSMAC chip from Bitsavers, but there is no reference to the earlier Microkit in this doc. The only printed reference to the Microkit I have is http://www.vintagecomputer.net/cisc367/EDN_Microcomputer_Systems_Directory.p df EDN Microprocessor Design Series Volume II 1975 This appears to be a supplement publication to the EDN Journal (?) I can use the Microtutor manual at least to get started. Bill

11 years, 3 months

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test-drb April 2013