test-drb April 2008

test-drb@ccmp.vtda.org

196 participants
307 discussions

TU-58s (was Re: Some progress with my PDP-11/73 system)

by ajp166＠bellatlantic.net

> >Subject: TU-58s (was Re: Some progress with my PDP-11/73 system) > From: "Ethan Dicks" <ethan.dicks at gmail.com> > Date: Wed, 11 Apr 2007 21:54:24 -0500 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >On 4/11/07, Jerome H. Fine <jhfinedp3k at compsys.to> wrote: >> But I once had a project that >> used a real DEC TU-58. Not the fastest "random" >> access device!!!!!!!!!!!!!!!!!! > >They work better as "sequential" access devices - being long and thin >and travelling in one dimension, go figure. We used to optimize file >order on our console TU58s to speed up the boot times on our 11/725s >and 11/730s. Since the file order doesn't change, one just builds a >TU58 with EXCHANGE with each file following the other. The console's >8-bit-micro must cache the directory block, since the tape didn't whip >back to the start between each file. > >Using unaltered console tapes from DEC resulted in, IIRC, about 15 >minutes from turning the key to booting the hard disk. Replacing that >tape with one of our own devising shortened that pre-boot time to well >under 3 minutes. > >I'd hate to rely on a TU-58 and no other block-addressable media on a >PDP-11, though. I survived a PDP-8 with a TD8E and TU56, but it was >somewhat tedious (cool to watch, though). TU-58s weren't as cool, >IMHO. So happens one of my "small" pdp-11s uses a Tu58. the system is a BA-11V with an 11/23 256k of ram, DLV11J and MRV11 rom(boot). Takes 10 minutes to boot, setup VM: then copy key files to and reboot. After that it's pretty decent even if I have to access a file on tape. Everytime I runs it with a bunch of kids of the current PC generations they go gaga and comment on how slow then I explain the amount of ram and storage then they are amazed it can be a functional machine with so little. They can't imagine a useful machine with 32kW of ram and 256kb of storage. On the flip side I've used that same Tu58 to bring up iron that had no removable storage. It's slow but very dependable. Allison

15 years, 6 months

lead-free solder (was: Setting up a VAXstation)

by halarewich＠gmail.com

heres a link to some lead solder http://www.acehardware.com/product/index.jsp?productId=1290635&cp=2568443.2… Chris On 10/2/07, Zane H. Healy <healyzh at aracnet.com> wrote: > > At 11:37 PM +0100 10/1/07, Tony Duell wrote: > >For the first part, I'd offer to do it for you, but it would be illegal > >to do so. Owing to our totally daft laws, (a) I'd have to use lead-free > >solder, which I don't have, don't trust, and am not set up to use and > > How hard is it to work with lead-free solder, and is it becoming a > problem to get traditional solder in the US? I've been meaning to > pick up a few rolls. As I'm still using a roll purchased in the 80's > from Rat Shack for building a couple things for my VIC-20, I haven't > been going through it that fast. Though I seem to be using it more > often now than. > > >(b) > >it has been said that if an enthusiast (specifically a model engineer, > >but it would apply here too) does jobs for others, then his workshop > >becomes a workplace and is covered by all the daft health-and-safety > >rules that I have no desire to get involved with, and which quite > >honestly, would stop me from getting on with things. > > Does it count as a job if you don't take payment? > > Zane > > > -- > | Zane H. Healy | UNIX Systems Administrator | > | healyzh at aracnet.com (primary) | OpenVMS Enthusiast | > | MONK::HEALYZH (DECnet) | Classic Computer Collector | > +----------------------------------+----------------------------+ > | Empire of the Petal Throne and Traveller Role Playing, | > | PDP-10 Emulation and Zane's Computer Museum. | > | http://www.aracnet.com/~healyzh/ | >

15 years, 7 months

Vintage Computer and Gaming Marketplace

by mbbrutman-cctalk＠brutman.com

Just a quick introduction - besides being the guy who can't make his IBM 6904-20 Lighted Programmable Function Keyboard work on a serial port and writing a TCP/IP stack from scratch that runs on a PCjr, I am also a moderator at The Vintage Computer Forums web forum ( http://www.vintage-computer.com/vcforum/ ) . Some of you are regulars there too, but it is more PC and smaller computer oriented than most of you on this list are. We have many of the same problems with well known auction sites that many subscribers here have. We also have enough traffic in our 'for sale' section of the forum to finally warrant a more structured auction type service. So we are happy to announce "The Vintage Computer and Gaming Marketplace" at http://marketplace.vintage-computer.com/ . The idea is give vintage computer collectors an alternative to your favorite big site that is more targeted to our specific interests. It is simple to use, it supports auctions and normal fixed price sales, and there is none of this sniping bogusness that happens on eBay. Best of all, it's completely free to use - no listing fees. Thanks for reading, Mike PCjr nutcase and soon to be TRS-80 Model 4 nutcase

15 years, 8 months

Where to find memory ICs?

by trixter＠oldskool.org

Have a working Intel Above Board Plus 8 with 2MB RAM and would like to populate it to the full 8MB. It will take 120ns or faster 1mbit chips -- but where can one find that kind of thing nowadays? Are those still commercially available or am I going to have to scavenge them from somewhere else? Manual lists acceptable part numbers like: Fujitsu MB81C1000P-xx Hitachi HM511000P-xxS Mitsubishi M5M41000AP-xx Motorola M5M511000P-xx NEC UPD421000C-xx NMB AAA1M100-xx OKI M511000RS-xx Samsung KM41C1000P-xx TI TMS4C1024-xx Toshiba TC511000P-xx ...etc but google searches haven't been very fruitful (that is, the pages returned when I search for IC part numbers don't return vendors with plain pricing/availability info). I just want a few tubes of these to populate the board, I'm not looking for a box of 'em :-) Any pointers? -- Jim Leonard (trixter at oldskool.org) http://www.oldskool.org/ Help our electronic games project: http://www.mobygames.com/ Or check out some trippy MindCandy at http://www.mindcandydvd.com/ A child borne of the home computer wars: http://trixter.wordpress.com/

15 years, 8 months

Bernoulli/Syquest carts available

by SUPRDAVE＠aol.com

I've more of these than anyone will need and they're all brand new. 3 packs of Bernoulli 5.25 44meg disks KAO 5.25 88meg syquest disks. The label inside says they are formatted for Macs but includes software for wintel machines also. $1 each plus whatever for shipping and they're yours. Just say how many you want. -- I am not willing to give up my privacy for the false promise of 'security'

15 years, 9 months

Vintage Computer Festival/Midwest 4 - Just one week away

by pat＠computer-refuge.org

Just a reminder that next weekend is my 4th annual Vintage Computer Festival/Midwest, held at Purdue University's Stewart Center. The event has speakers from 11am until 1pm each day, and the exhibits are open from 1pm until 5pm. The ticket price is $5 per day, or free if you're 17 or under, or have a valid Purdue student ID. The event is a celebration of the history of computing, and the machine and people that got us to where we are today. There will be lots of neat technology, and this year we have a door prize of an IBM PCjr from 1983! The PCjr was IBM's first attempt at an inexpensive home computer. I've got several exhibitors signed up, but still have room for more; if you want to show up to show off your collection, or have a few things to sell off at the consignment sale, sign up to be an exhibitor at http://vintage.org/2008/midwest/, or send me an email at this address. Exhibitors get one free t-shirt and free admission, which is included in the $10 per table fee. Pat -- Purdue University Research Computing --- http://www.rcac.purdue.edu/ The Computer Refuge --- http://computer-refuge.org

15 years, 9 months

PDP-8 "Introduction to Programming"

by dave.symmes＠hp.com

I tripped across this email link on a Google search. I was the author of the original PDP-8 * "Introduction to Programming", published in either late 1968 or early 1969. I hired onto Digital straight out of college as a tech writer joining a department of four writers for the whole company. Almost 40 years later I am still with HP. Dave Dave Symmes Solution Alliances Engineering (978) 777-6157 - Phone (978) 742-1078 - Fax

15 years, 10 months

Prepare to chuckle...

by sellam＠vintagetech.com

http://www.vintage.org/blog.php?action=read&pid=22 -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

15 years, 11 months

New to VAX (4000/200)

by rescue＠hawkmountain.net

I am the 'proud' owner of a VAX 4000/200. I have not tried to do much with it yet, first I'll indicate it's config, then my questions (as I'm 'new' to VAX (I admin'd one for a bit 14 years ago... but I deferred to several folk on campus as I was new to admin'ing VMS and I didn't stay in the role long enough to really pick much up)). M9715-AA VAX 4000 internal card (terminates DSSI and SCSI busses) M7626-AA KA660 CPU M7622-AT 16M Memory M7622-BF 8M Memory M3108-PA DSV11-S 2 Line Sync Comm SI-SC 1000 System Industries SCSI card M3118-YA CXA16-M 16 Async Line M3118-YA CXA16-M 16 Async Line M3119-YA CXA08-M 8 Async Line M3118-YA CXA16-M 16 Async Line M7559-00 TQK70 Tape controller are the cards present (from slot 0? (rightmost slot)) And it has 3 DSSI drives, 2 5.25" RF31 (381M) and 1 3.5" RF36 (in one of the 'rail' sets that will support 2 3.5" drives) (1.6G). the 2 RF31s are ID 0 and 1 the RF36 is ID 2 It also has a TK70. Now onto the questions: 1. How is 24M of RAM ? Should I be on the lookout for more ? 2. What releases of VMS, Vax Ultrix, etc should I limit myself to based on 24M and KA660 ? 3. Was there a DSSI version of TK70 ? 4. 4000/200 does not have SCSI, correct ? (other than someone added an SI SC-1000) 5. any idea if a SCSI CD can be booted via the SI SC-1000 ? (boot cmds would be ?) 6. This is supposed to have some version of VMS on it... I have no PW... pointers to 'break in' procedure and password reset ? What is the default sysadmin account as well ? 7. There is what looks like a 50 pin scsi terminator (small size like Sun 411 case) that I've identified as DSSI terminator., What is the 50 pin centronics style connector above that ? 8. What is a DSV11-S good for ? 9. Not that I plan to, but how do you make use of the async cards (they have 50 pin centronics style connectors) 10. Anyone got any more of the 2 3.5" drive mounting assemblies ? 11. Anyone got any RF36 or higher density DSSI drives available ? 12. Can the DSSI drive 'bus' be converted to SCSI ? 13. What is the largest drive/partitions supported on 4000/200 (DSSI or otherwise) ? 14. Have I asked enough questions ? (What have I forgotten to ask :-) ? ) How are the 4000/200 machines ? (Other VAXen I have is VAXStation 2000 and VAXStation 3100, neither of which is running (driveless))... I find the enclosure design pretty cool... and for a large box, has nice design (visually)... (I know it is no SGI... and that it is DEC beige.... but I like the design (doors, badge, etc)). Any drop in cpu/memory upgrades that are worthwhile (in the free to cheap territory of course :-) ). Thanks in advance for any cool info/pointers/etc... -- Curt

15 years, 11 months

8251 troubles

by cclist＠sydex.com

Date: Tue, 29 Apr 2008 17:49:41 -0700 From: dwight elvey > Still a strange problem. This is past the point where I'd have my logic probe out (if you don't have one, they're easy enough to make)--and this is a perfect application for one, as the signals aren't super-fast. Bring your test up, send a character to get the software into the state where it quits receiving. Let's check the static signals first. Is pin 22 (DSR/) low? If not, check your "null modem" cable and any level conversion logic upstream from that pin. While you're at it, check that pin 23 (RTS/) is low so that you can transmit when the time comes. Now for the dynamic tests. A logic probe with a "pulse stretcher" is needed here. Fortunately, most have this feature. Next, put a probe on pin 3 (RxD) and make sure that it's pulsing with each character sent. And then check pin 14 (RxRDY). Does it pulse high with each received character? If it goes high with the first and stays high, then you're not retrieving characters after the first. But if it pulses high only once and then stays low, check your chode. Somehow, you're disabling the receiver, perhaps as part of the "TOUT" code. (This is bit 2 of the command word and must be set for the receive side to operate). The third possibility, that RxRDY pulses with each received character, says that you're actually picking up the data and it's not getting echoed back (hint: check the status of your CTS line). Let us know what you find. Best, Chuck

15 years, 11 months

← Newer
1
2
3
4
5
6
7
...
31
Older →

Jump to page:

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

test-drb April 2008