test-drb October 2017

test-drb@ccmp.vtda.org

91 participants
94 discussions

Anyone know who does 'decmuseum.org', PDP-5 pictures

by jnc＠mercury.lcs.mit.edu

Does anyone know who does this site: http://decmuseum.org/index.html I looked, and didn't see anything in the site itself, and doing a 'whois' didn't turn up anything useful. The site has some really nice PDP-5 photos which I was wondering if that person could/would put in the public domain, so I can use them for a PDP-5 article I'm working on for Wikipedia and the CHWiki. So I'd like to get in contact with them. Noel

7 years, 1 month

NEC 4164-12

by emu＠e-bbes.com

Hi all, anybody has some spare in the bin, he doesn't need? Looking for 18 pieces, preferably NEC, -12. Thanks!

7 years, 1 month

Anyone know who does 'decmuseum.org', PDP-5 pictures

by jnc＠mercury.lcs.mit.edu

Thanks, everyone! Got it. Noel

7 years, 1 month

PDP8.org

by tingox＠gmail.com

On Sat, Oct 28, 2017 at 1:42 PM, Paul Birkel <pbirkel at gmail.com> wrote: > Are you sure that you're not looking at a local cache? It doesn't look like a local cache to me: tingo at kg-core1$ curl http://pdp8.org/ | head % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <meta name="POSTINFO" content="http://www.pdp-8.org/postinfo.txt"> <meta name="ProgId" content="FrontPage.Editor.Document"> <meta name="keywords" content="pdp8, pdp12, pdp-8, pdp-12, linc"> <meta name="GENERATOR" content="Microsoft FrontPage 4.0"> <title>PDP-8.org: a PDP-8 and PDP-12 resource</title> 100 8656 100 8656 0 0 8656 0 0:00:01 --:--:-- 0:00:01 30265 curl: (23) Failed writing body (0 != 1603) and tingo at kg-core1$ host pdp8.org pdp8.org has address 216.99.193.149 pdp8.org mail is handled by 10 mx.spiritone.com. tingo at kg-core1$ ping pdp8.org PING pdp8.org (216.99.193.149): 56 data bytes 64 bytes from 216.99.193.149: icmp_seq=0 ttl=55 time=139.792 ms 64 bytes from 216.99.193.149: icmp_seq=1 ttl=55 time=140.435 ms ^C --- pdp8.org ping statistics --- 2 packets transmitted, 2 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 139.792/140.113/140.435/0.322 ms HTH -- Regards, Torfinn Ingolfsen

7 years, 1 month

"documentary"

by cctalk＠snarc.net

The video is produced by an openly libertarian organization: https://www.youtube.com/user/ReasonTV/about. It's an interesting story but that is propaganda not a documentary. ________________________________ Evan Koblentz, director Vintage Computer Federation a 501(c)3 educational non-profit evan at vcfed.org (646) 546-9999 www.vcfed.org facebook.com/vcfederation twitter.com/vcfederation

7 years, 1 month

Which Dec Emulation is the MOST useful and Versatile?

by cclist＠sydex.com

On 10/27/2017 01:01 PM, Paul Koning wrote: > Oh yes, and if you look at the wire lists (on Bitsavers) you will get the length of every wire in the machine. The trouble is that, even if you use the documented delay per foot, things don't necessarily match. The stated logic stage delay is 5 ns, no special numbers given for twisted pair drivers. In my model, I do everything in 5 ns multiples (to keep the simulation time under control). That works pretty closely, but not 100 percent, not for some of the CPU pieces. The other thing that's nuts is that the CPU effectively has a 20-phase clock: the documentation shows clock signals with offsets from the reference time given in multiples of 5 nanoseconds (for the 100 ns clock period). And yes, it matters. And yes, many (I'm not sure about all) of the 20 phases are actually used in the CPU. I can't recall, but didn't the 6600 have something like 10 clock sources, all kept synchronized? In any case, it's a gross oversimplification to say that the 6600 had a 10 MHz clock. --Chuck

7 years, 1 month

Apple II no video display

by dave.g4ugm＠gmail.com

Folks, I have an Apple II that produces one beep at power on, but my monitor says "no video present". A scope on the output shows frame sync but at low levels. The odd thing is that ic A9 appears to be a 74S151 not a 74LS151. I wouldn't expect this to work, but I assume it was working at some point in time! I have done some googling and can't see any reference to this substitution. Is it something any one else has seen? Dave Wade

7 years, 1 month

RK05/BA11 slides

by jnc＠mercury.lcs.mit.edu

> From: "Rob Jarratt" > I misread your email as suggesting that the 124 was more suitable than > the 122 No, it's just cheaper (at the moment), and can be made to work. > My H960 is not very accessible but I attempted to measure it front back > and it may be 25". Do you know where should the length be measured? You don't need to measure anything. The C-230-S-122 is the _exact_ part DEC used originally for mounting RK05's in H960's. Noel

7 years, 1 month

Contacting the list admin?

by mikew＠thecomputervalet.com

Hello, I've been trying to unsubscribe from the list. I did it once before and hadn't seen anything for months. However, I suddenly started receiving mails last weekend. I went to the webpage to unsubscribe but I can't login and neither the password reset or unsubscribe confirmation make it to me. So I'm hoping someone can tell me how to contact the list admin. I emailed an address I found on the website but I hadn't received a response yet. I may not have waited long enough but I don't know. Cheers, Mike

7 years, 1 month

Which Dec Emulation is the MOST useful and Versatile?

by jnc＠mercury.lcs.mit.edu

> From: Kip Koon > I tend to get emulation and simulation a bit confused. You and me both! I think part of the problem is that there is no generally-agreed-upon definition of the two terms. I like this one a lot, though: https://stackoverflow.com/questions/1584617/simulator-or-emulator-what-is-t… Emulation is the process of mimicking the outwardly observable behavior to match an existing target. The internal state of the emulation mechanism does not have to accurately reflect the internal state of the target which it is emulating. Simulation, on the other hand, involves modeling the underlying state of the target. The end result of a good simulation is that the simulation model will emulate the target which it is simulating. Ideally, you should be able to look into the simulation and observe properties that you would also see if you looked into the original target. In practice, there may some shortcuts to the simulation for performance reasons -- that is, some internal aspects of the simulation may actually be an emulation. ... EDIT: Other responses have pointed out that the goal of an emulation is to able to substitute for the object it is emulating. That's an important point. A simulation's focus is more on the modelling of the internal state of the target - and the simulation does not necessarily lead to emulation. ... SPICE, for example, cannot substitue for an actual electronics circuit There's also the question of what's being emulated. Ersatz-11, for example, does a good job of looking like a PDP-11 - for the software. However, it does not like a PDP-11 for the hardware (although John used to sell boards you could plug into a PC, which provided a QBUS, IIRC). So is it a simulator or an emulator? Good question. About the only _generally-agreed_ example of the terminology I can think of are 'in-circuit emulators', which _exactly_ match the behaviour of a given chip. Noel

7 years, 1 month

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test-drb October 2017