test-drb March 2016

test-drb@ccmp.vtda.org

189 participants
229 discussions

by jnc＠mercury.lcs.mit.edu

So here's an 11/23+ in a nice BA11 box: http://www.ebay.com/itm/322046582015 If I wasn't _already_ knee deep in the blasted things, I'd buy it myself! ;-) The other cards aren't too interesting - an MXV11-A, MRV11-C (I think), a 64KB memory card, and what looks like an off-brand DLV11-J; and some sort of disk. Still, not a bad price (so far) for the CPU, box, and a handfull of boards. Noel

8 years, 8 months

R: Re: RSX-11 trouble

by supervinx＠libero.it

Well... REM ...AT. worked since an AT entry was present in the TAL output INS $BIGIND not INS -- File not found Disk (RD51) has 850 blocks free after some cleaning up. It had 738 before.

8 years, 8 months

RC2014 homebrew computer

by lproven＠gmail.com

I confess it is in no way a classic machine, but I thought that this might be of interest to some people here. I had not heard of it before until a chance retweet from a ZX Spectrum-related account today: http://rc2014.co.uk/ ? RC2014 is a simple 8 bit Z80 based modular computer. It is inspired by the home built computers of the late 70s and computer revolution of the early 80s. It is not a clone of anything specific, but there are ideas of the ZX81, UK101, S100 and Apple I in here. Built mainly with parts donated to Nottingham Hackspace and components salvaged from random bits of equipment, it uses modern PCBs. It runs on a backplane that hosts the individual modules. This has standard 0.1? header sockets meaning new modules are simple and cheap to design and can use Veroboard or even jumper wires to breadboard. For resilience, most of the modules have been designed on to dedicated PCBs. In it?s typical basic form it has; 32k RAM, 8k ROM (running Microsoft BASIC), 3.7628Mhz Z80 processor serial communication at 115200 baud. Other modules include 8k x 8 bank switchable EPROM, SD card bootloader, ZX Printer interface, Blinkenlights, LED dot matrix display driver, LCD display driver ? (Errors in the source material.) More info and purchasing sources: https://www.tindie.com/products/Semachthemonkey/rc2014-homebrew-z80-compute… And a (for my money, insane, but) interesting peripheral: https://hackaday.io/project/9567-5-graphics-card-for-homebrew-z80 -- Liam Proven ? Profile: http://lproven.livejournal.com/profile Email: lproven at cix.co.uk ? GMail/G+/Twitter/Flickr/Facebook: lproven MSN: lproven at hotmail.com ? Skype/AIM/Yahoo/LinkedIn: liamproven Cell/Mobiles: +44 7939-087884 (UK) ? +420 702 829 053 (?R)

8 years, 8 months

OT: was: Re: AT&T Uverse IPv6 vs. Mac OS X 10.(old)

by jnc＠mercury.lcs.mit.edu

Apologies all for the OT; just a few _brief_ replies. If anyone wants a serious discussion about this, the internet-history list would be the place to start it. > From: Charles Anthony > What they did was 'NAT plus IPV6 will solve everything.' Yes, but not explicitly; the 'official' IETF position was 'IPv6 will replace IPv4', and they pretty consistently refused to acknowledge that NAT would likely play a major role. I 'sort of' understand the second part - NAT is, architecturaly, very grubby (for a long list of reasons this is not the place to go into) - but it soon got the point of ostrich-like refusal to recognize reality - which meant that instead of an _architected_ approac to using NAT, it mostly got an utterly 'ad hoc' adoption. > From: Robert Johnson > So, I'm curious what your objections to v6 are It's different from IPv4 (i.e. old code can't understand it), but not different enough (i.e. it doesn't have enough new capabilities to make it worth switching to - IPv4 has many architectural issues, but that topic is too complex to go into here). > how would you solve the shortage of IP addresses? You have to start by realizing that IPv4 addresses serve at least three functions: i) identify the communicating device (in the sense that 'Noel Chiappa' identifies me), ii) says _where_ the thing is in the Internet (like a street address does IRL), and iii) is used by intermediate switching nodes to forward traffic. So the first step is to pull out ii) and iii), which can be done without modifying the hosts, and there are many designs that did so. Alas, a fuller discussion of this complex topic is not really appropriate here... Ask on internet-history, if you want to know more. Noel

8 years, 8 months

PDP-11 M873 ROM card info?

by jnc＠mercury.lcs.mit.edu

> Does anyone have a -YB we can dump? Can I repeat my plea for this? (And also a -YC?) > I have a -YA, and will dump that in a few moments OK, I'm mostly done with the disassembly; available here: http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/M873-YA.mac I haven't fully understood the TA11 code (and don't plan to), nor the DECtape/magtape code (might get to that some day), but the disk and paper tape code is completely done. (I'm currently loading over serial lines, for getting the machines running, etc.) The paper tape code is 'interesting'; it took me a while to figure out _exactly_ how it worked. It appears (to me, at least) that that code will not function correctly unless the abs-loader has at least one byte of '0' pad on the end of it, for two reasons. (See the comments on the listing.) Luckily, my copy of the abs loader binary has such; although real .LDA tapes have blank leader, of course, the .LDA files I'm generating don't. The serial line code in the M9301 (-YA at least, and probably the others too) uses the identical code, so it has the identical issue. Noel

8 years, 8 months

RSX-11 trouble

by supervinx＠libero.it

Hi! Got a MicroPDP 11 plus. It seems to be misconfigured. It can't execute .CMD files, reporting Task "...AT." terminated Load failure. Read error No disk errors are reported with ELI DU0:/SH Disk seems to work: I can run .TSK files. The file STARTUP.CMD isn't read at all. Any hints? Which file is executed right before STARTUP.CMD? I see two RED commands and a MOU before it tries to read [1,2]STARTUP.CMD and reports the aforementioned error. Thanks

8 years, 8 months

MEM11A update

by ggs＠shiresoft.com

I just finished laying out the board for the MEM11A. The last roadblock was figuring out where the last 3 unrouted wires were. EagleCAD didn?t make it easy to find them and I haven?t quite figured out how to use the autorouter on Eagle 7.5, so I did this all by ?hand? (at just under 2000 wires it took a while). I haven?t re-set the grid from all of the other boards (all thru hole parts) that I?ve done, so this board is probably not optimal (plus I was getting the hang of doing a 4 layer board). I ran into a lot of wiring congestion that caused me to reroute the entire board as I moved parts around. Even with a finer grid pitch it?s unlikely that the UMF11 will fit on a single SPC board. I?m going to check the board over for the next week or so before I send it out and about 4 weeks after that I?ll have the first boards that I can populate and try out! TTFN - Guy

8 years, 8 months

Here's what happens when an 18 year old buys a mainframe...

by COURYHOUSE＠aol.com

reminds me of myself dragging him big racks of military comm surplus gear when I was in HD Keep it up Connor! we are proud of ya! Ed Sharpe archivist for SMECC _www.smecc.org_ (http://www.smecc.org) In a message dated 3/29/2016 4:28:17 P.M. US Mountain Standard Time, jwest at classiccmp.org writes: Evan wrote... > Connor is a member of our user group here in the Mid-Atlantic. He's > been learning at an astonishingly quick rate! > He's been a member on this list for quite some time, and is a regular on the evening crew of the #classiccmp irc channel as well. He was working on a DG Nova 3 before the Z machine arrived, hope he gets back to it as well :) J

8 years, 8 months

Old PC Boards and some Books to go

by pontus＠Update.UU.SE

Hi Some gems in there. Will you ship? How much do you want for the DECsystem-10 books? /P On Tue, Mar 29, 2016 at 12:08:28PM -0400, Dave Mitton wrote: > Guys, > still trying to clean out my basement... recently I've gathered a bunch > of PC cards from over the years. > and some of my old text and data books. Still working on listing some more > and some various kits of PC software. > I'm not assuming this is worth much, just rather pass it on, than dispose. > > I've put a list (so far) of the stuff on this web page. I have photos of > the PC cards if interested. > http://dave.mitton.com/computer_clearance.html > > Dave Mitton, > North Andover, MA > > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus >

8 years, 8 months

Seiko Wrist Terminal RC-1000 software ??

by dave＠mitton.com

Another old thing I've been interested in selling, is my SEIKO RC-1000 Wrist Terminal. This watch has a two line 12 character display, where you could also load text and alarm/reminder data. I used it for phone lists and meeting reminders. It comes with a DB25 cable that connects to the watch to download data. Example on eBay: http://www.ebay.com/itm/RETRO-1980-s-SEIKO-WRIST-TERMINAL-S501-4000-RC-1000… I'd been trying to figure out where I misplaced the 5.25" floppy with the software, until this last weekend, I found it in a stack of old Infocom game floppies. Unfortunately, when I stick it in my one remaining working 5.25" floppy drive, it made a little noise and decided it couldn't detect formatting. Looking at the diskette, there seems to be some marks on the oxide. Possibly a head load problem. It's also possible that it's just an old format this system doesn't recognize. Anyone in the area (north of Boston) have a working old PC? This is labeled as an IBM/MS-DOS version. I used it once many years ago. Does anyone have this software archived or available? SEIKO PCDatagraph Data Manager circa 1984 Dave. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

8 years, 8 months

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test-drb March 2016