test-drb

test-drb@ccmp.vtda.org

101090 discussions

by gil＠vauxelectronics.com

Jeffrey: I made a board a couple of years ago that provided a current loop interface and a pic for ascii/baudot and speed conversion. I am in the process of a second-gen of that board. It will let you use a baudot machine to interface to a 232 port in ascii. If you get the 32, let me know; but don't pay too much. On the plus side, even if you don't want the 32 down the road, you can find a 33 in ratty cosmetic condition and swap the guts, since the 32 looks like it has a case and stand in very good condition (not easy to find good cosmetics). gil >Date: Sat, 1 Mar 2003 22:32:58 -0600 >From: >To: ClassicCmp Lists <cctalk(a)classiccmp.org> >Subject: ASR-32 Usable as Terminal? >Reply-To: cctalk(a)classiccmp.org > >> >> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3010656618 > >I just realized, *after* bidding, that this TTY on eBay is a 32, not a 33. >Oops. Since it uses baudot code instead of ASCII and has a rotary dialer on >its CCU, is it useless as a terminal for a PDP-11? What would be required to >make it useful for a terminal? > >I'm thinking that I should cancel my bid. I want a TTY solely to have a >period terminal for my PDP-11/20. :-/ > >Yes, I have read the following in the "vital poop" thread: > >> Before you spend big bucks on ebay >> ---------------------------------- >> A Model 33 has a four-row keyboard (not including the space bar). >> A Model 32 has a three-row keyboard (not including the space bar). >> The 33 is ascii, and the 32 is baudot. >> You cannot (prctically) modify a 32 into a 33. > >-- >Jeffrey Sharp ;----------------------------------------------------------- ; vaux electronics, inc. 480-354-5556 ; http://www.vauxelectronics.com (fax: 480-354-5558) ;-----------------------------------------------------------

23 years, 1 month

Just for the sake of asking... (was - RE: Trivia Question)

by Edward.Tillman＠valero.com

Gee! You musta worked at the same place, or one very like it. :) Ever seen any of those old parts floating around? Cheers! Ed San Antonio, Tx, USA -----Original Message----- From: Eric Smith [mailto:eric@brouhaha.com] Sent: Thursday, February 27, 2003 2:09 PM To: cctalk(a)classiccmp.org Subject: Re: Just for the sake of asking... (was - RE: Trivia Question) Edward Tillman writes: > It that a "real computer?" Of course it was! But they didn't so much have light pens as "light guns", right? And I can't think of too many other computers that had ashtrays built into the consoles.

23 years, 1 month

Calcomp incremental plotter

by djg＠drs-esg.com

I just got a Calcomp 563 incremental plotter. Does anybody have a manual that I could get a copy of or at least know the pinout of the connector and what the mate is (round multipin). Also does anybody know where I can get supplies such at the 30" sprocket feed paper rolls (still doing a web search but only found 36" so far) and the pen. The pen looks like a short ballpoint cartridge so hopefully I can cut a normal one down if I can't find an identical one. Thanks, David Gesswein http://www.pdp8.net/ -- Run an old computer with blinkenlights.

23 years, 1 month

DEC Server 300

by cb＠mythtech.net

>A DECserver 300 is about 19"x12"x4.5", weighs 10-15 lbs (guessing), and has >16 MMJ's (modified modular jack), an AUI (thickwire Ethernet), and a >10Base5 (coax Ethernet) connection on the rear. Mine has a "tabletop" >plastic shell on it with rubber feet under it, although many of these were >sold without the case and were rack mounted. My unit has a beige-ish plastic >shell over a gray metal box. Units without the plastic shell with be gray >and "gold" alodyne finished" aluminum. Ok, then I'm pretty sure it isn't in the dumpster. Something of this size/appearance would have caught my eye. If it had been along the lines of a PC desktop or tower case, I could see that I might have over looked it, but anything rack mount I think I would have noticed. But I think I may take another swing by tomorrow during the day. The place should be closed since Paramus has annoying Blue Laws and nothing is allowed to be open on a Sunday. So that should give me some daylight and peace to dig some more. >Please PLEASE keep the book - I am sure someone will want it as they are >MUCH harder to locate than the device itself! I would ask for it but I >already have both the DECserver and a manual. I don't think it is a complete manual. There are two, both still shrinkwrapped, but they are more like a booklet then a manual. Pretty small. I don't recall what exactly they said on them. I plan to sort thru the stuff Monday. There may be other manuals that I missed. There is TONS of junk paperwork in the dumpster, so locating manuals would be a chore. If it doesn't pretty much land in your hand, it is unlikely to be spotted. There is one person on the list who has right of first refusal on the DEC stuff. Once he has taken what he wants, if there is anything left, I'll offer it up to the list. -chris <http://www.mythtech.net>

23 years, 1 month

ASR-32 Usable as Terminal?

by jss＠subatomix.com

George R. Gonzalez wrote: > I'm in a bit of an embarrasing situation-- after getting this nice Model > 32 WU tty, tsting it out, finding out it works perfectly, I finally > realize -- I don't have any space for it! ... So I've reluctantly put it > up for auction on eBay. > > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3010656618 I just realized, *after* bidding, that this TTY on eBay is a 32, not a 33. Oops. Since it uses baudot code instead of ASCII and has a rotary dialer on its CCU, is it useless as a terminal for a PDP-11? What would be required to make it useful for a terminal? I'm thinking that I should cancel my bid. I want a TTY solely to have a period terminal for my PDP-11/20. :-/ Yes, I have read the following in the "vital poop" thread: > Before you spend big bucks on ebay > ---------------------------------- > A Model 33 has a four-row keyboard (not including the space bar). > A Model 32 has a three-row keyboard (not including the space bar). > The 33 is ascii, and the 32 is baudot. > You cannot (prctically) modify a 32 into a 33. -- Jeffrey Sharp

23 years, 1 month

Sellam on Tech tv (again)

by n8uhn＠yahoo.com

Great show Sellam, I was really drooling over that apple 1 in the wooden case! hope to see more classic computers from your collection on tech tv. BTW any more info or updates an that very rare fps mini? Bill

23 years, 1 month

Sellam on TeeVee

by jpl15＠panix.com

Yo Sellam: good job on Screensavers this afternoon! A nice look at one of the last Apple 1s.... Cheerz John

23 years, 1 month

PDP-8/L: multiple failed 7440's date code 7005

by charlesmorris＠direcway.com

I have been busy debugging my PDP-8/L that last worked when stored in the barn around 1995. It is slowly coming back to life - still having problems with the core memory. I have noted one strange and recurrent problem. So far I have changed nine bad 7440's on a variety of modules, mostly core drivers (G221, G228) which have had their outputs stuck, usually high. All of them were labeled "DEC7440" with a date code of 7005! Currently lower page locations won't write the lower bits 5-11 (or at least return zeroes). The only common denominator for data bits 5-11 are at slot A09, where the MEM ENABLE 5-11 and MA ENABLE 5-11 lines are driven by, you guessed it, M617's featuring 7440's. Haven't verified this yet but it's a safe bet where at least some of the problem is! Has anyone else experienced this problem? Seems like the chip manufacturer must have had a few specks of dust in the fab room that day in Apr. 1970... -Charles

23 years, 1 month

LK250 Keyboard available

by geoffr＠zipcon.net

I'm pretty sure it's a LK250, this is a Dec Keyboard for PC's I've used it on AT class machines, but it's been gathering dust for a few years. (think LK201 for PeeCee) asking $30 plus S&H OBO (make me an offer, It can't hurt to ask)

23 years, 1 month

NEXT Keyboard question

by kenziem＠sympatico.ca

A friend has a slab but is missing the keyboard. Will a MAC keyboard also work? Does anyone have the pinout to let him rebuild one?

23 years, 1 month

Free DEC MINC-11 in NW England

by Lee.Davison＠merlincommunications.com

> I'm on it - I'm maybe 2 hours away from there so I can pick up, assuming a) > I can get it in the garage and b) my girlfriend doesn't kill me :) I'll send flowers. 8^)= Lee. ________________________________________________________________________ This e-mail has been scanned for all viruses by Star Internet. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________

23 years, 1 month

An H89 issue

by MBuhler＠itt-tech.edu

Hi Tom, I found you after a google search. I used to have several working H89s but I got rid of all them. Now I've found 5 H89 floppies which I think contain good information but of course I can't read them any longer. I live in Grand Rapids Michigan and would drive a couple of hours to visit someone who owns a working H89 just to find out what is on those floppies. Do you know of anyone who could help me? Max Buhler: mbuhler(a)itt-tech.edu

23 years, 1 month

More PDP-8/L repair fun (bits won't read/write)

by charlesmorris＠direcway.com

Some of my bits not setting turned out to be bad parts on the front panel! 15 years ago I installed LEDs/resistors in place of all the (mostly burned out) incandescent lamps. One had a cracked composition resistor, and the other an open (base-emitter) driver transistor. As I posted earlier, the problem with the core not reading/writing bits 5-11 was indeed the MEM ENABLE signal from the M617 in slot A09. But the 7440 was good for a change (not one of the bad batch with 7005 date code). Turns out the wire from that pin on the backplane was installed too tightly at the factory and had shorted through the insulation to a ground pin. Now the core works, and CPU executes various test programs; SR, AC, MB, MA all working fine... EXCEPT it won't read/write on any of the 128 bytes of page 0! Going to try to figure that one out tonight... Another strange find - the PROTECT key did not, in fact, protect the upper page (7600-7777) of core. I found a factory-appearing wire on the backplane, jumpering the output of an inverter directly to ground! Some idiot probably was bothered by noise giving false PROT errors or couldn't figure out that the switch is off when in the down position, and just shorted the signal out. Now that works, too. Didn't fix the page-0 problem either. The DF and IF switches do nothing (i.e. flipping them does not bomb a running program, or prevent reading/writing from the front panel switches), but I think that's normal without the extra 4K installed. -Charles

23 years, 1 month

Calcupen

by francois＠auradon.com

Hi all, How would one go about disassembling a calcupen? Mine is not coming up anymore with a fresh battery. I would like to see what's up inside: look for corosion and stuff. Thanks Francois Minnesota

23 years, 1 month

Motorola MCM6665BP20 Specs

by melamy＠earthlink.net

Hi Tim, The format is 64K x 1 with an access time of 200ns. It was introduced sometime before 1982 as it appears in my 1982 IC Master. I have specs for the 6664 part if that would help, but it is supposed to be compatible with the more generic 4164 chip in case you already have specs for that. Best regards, Steve Thatcher >--- Original Message --- >From: "Tim" <thodgson(a)pnc.com.au> >To: <cctalk(a)classiccmp.org> >Date: 2/28/03 2:02:18 PM > G'day, >I've recently been going through a few items I had tucked away & found a bunch >of IC's... >Now I'm going through them, one by one, & trying to find as much info I can >find. > >So far, I've found nothing on the Motorola MCM6665BP20, a 16pin chip with a >secondary code of FQD8432. >I'm trying to find complete specs, any idea's? > >Thanks in advance, > >Tim.

23 years, 1 month

HP 2100A hardware reference docs?

by glenslick＠hotmail.com

I picked up an HP 2100A a couple of days ago and before I do anything with it I'd like to find some hardware reference docs which describe the boards which should be installed, along with schematics and such. I haven't found a copy on the web. Does anyone know where a copy might be found? I have no idea if I have a full set of cards for a functional CPU. All of the blue slots are full of A1-A9 cards. I assume those are the main CPU logic cards. It also looks like there is a 4K two card core memory set (XYD/SSA) plus an 8K two card core memory set. Plus whatever the ID/IDL/DC cards do. The power switch key is gone. Is there a way to bypass that? Also the F5 fuse cap and fuse is gone from the back panel. I hope that is not a sign of power supply problems. The boards installed in the CPU card cages are the following: Front Cage Rear Cage A1 XYD -\ 02100-60052 top jumper A2 SSA(4K) -/ A3 SSA -\ 02100-60054 top jumper A4 XYD -/ A5 ID(16K) -\ \ ribbon cable top jumpers A6 IDL | / A7 DC -/ A8 A9 (twelve empty slots) TERM BUF'R'D TTY 12531 _________________________________________________________________ Help STOP SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail

23 years, 1 month

DEC Server 300

by cb＠mythtech.net

What does a DEC Server 300 look like? About how big are we talking about? I unloaded the dumpster pulls from last night, and one of the manuals was marked DEC Server 300. So I'm kind of assuming that might be the DEC the other parts came from. I'm thinking of going back for another dive tonight, so I'm wondering what exactly I should be looking for. Or if this is a large machine, I can pretty well say that it isn't in the dumpster. -chris <http://www.mythtech.net>

23 years, 1 month

decserver 550 in Kansas City

by mbg＠TheWorld.com

>> I read somewhere that it could be converted to a 11/53 with a minimal >> effort. How much trouble? >Rip out the CXA's (16-port serial boards), add a disk and/or tape >controller, and perhaps some memory. Off you go. The heart of >the DECserver 550 was/is indeed a barebones /53 CPU. Which comes >with 512KB RAM on the CPU card, and its console serial port. I don't believe you are "ready to go" after this mod. I seem to remember that the ROMs on the DS500 use special boot code and that they need to be replaced to be a normal 11/53. I saw some posts on one of the newsgroups from someone who had done it. Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | email: mbg at world.std.com | | | | | "this space | (s/ at /@/) | | unavoidably left blank" | URL: http://world.std.com/~mbg/ | | | "pdp-11 programmer - some assembler | | (DEC '77-'98) | required." - mbg KB1FCA | +--------------------------------+-------------------------------------+

23 years, 1 month

HP 7905/9706 ??

by aek＠spies.com

>Any body on here seriously interested in the HP 7905 and 7906 disk drives? possibly, depending on location (i'm in the SF bay area) 12995 isn't showing up on any of my parts lists. Was it an HP1000 interface card?

23 years, 1 month

UK TV programme: The Programmers

by avickers＠solutionengineers.com

There's a programme on BBC2, Thursday 6th March at 6.30AM (yup, AM), called "The Programmers" It purports to be about "the history of computing, from hardware and software to programming, and the people who devised the code to make them work". I'll tape it (if I remember). I suspect it's an Open University programme, so with a bit of luck it'll show some truly old hardware, as well as some shocking kipper ties and psychedelic chunky-knit jumpers :) -- Cheers, Ade. Be where it's at, B-Racing! http://b-racing.com

23 years, 1 month

Neon logic

by bnansel＠mail.nauticom.net

I came across reference to a file, LAMP.ZIP, you posted briefly for the Classic Computer list back in '99. Would it be possible for me to get this file? I'm fascinated by the idea of making counters, logic gates, and memory elements using neon lamps, but repeated google searches reveal very, very little hard information (other than there were such circuits). Also, I've read a few pages on early calculators (such as the Anita) using something similar to neon lamps for logic gates and ring counters, though the pictures lead me to believe they are actually 4-lead gas triodes or thyratrons of some kind. Do you know what these beaties actually were? Finally, I've repeatedly run across mention that neon device switching is slow, but how slow are they? You assistance is appreciated! -RLN

23 years, 1 month

TRS-80 Model 4 help requested

by pat＠purdueriots.com

I recently picked up a TRS-80 model 4, that seems to have problems with its floppy drives. The machine is a base Model 4 with 64KB of ram (I think - haven't yet taken the EMF shield off the mainboard), and no peripherals attached. When I powered it up the first time, with or without a disk in the (bottom) drive, it displayed "Cass?" on the screen, and then I could press enter to that and the "Memory size?" prompt, and get a basic prompt. I tried swapping the floppy drives, and that time I got a "Diskette?" prompt if there was no disk in the drive, and pressing any keys didn't cause anything to happen. If I put a disk in the drive, the machine never displays anything, and then after 10-20 seconds, the drive light goes out. I tried connecting only one drive at a time, with the same results. If I connected a 1.2MB floppy that I had laying around (a Teac FD-55GFR-149-U), it did the same thing as if the drives were swapped. Yes, I realize that the drive probaly wasn't going to work, I just wanted to see if it did anything. Also, the disk I used was supposed to be a TRS-DOS (bootable) disk, but it's possible that they've gone bad after so many years. Are the disks on the Model 4 recorded so that I can read them on a PC (IE 48/96tpi MFM, compatible with the NEC D765)? I'd like to know if I can make backup images and/or see if the disks work on another machine. Thanks. Pat -- Purdue Universtiy ITAP/RCS Information Technology at Purdue Research Computing and Storage http://www-rcd.cc.purdue.edu

23 years, 1 month

Anybody know what a HP 12995 is?

by rigdonj＠cfl.rr.com

Just like the title says. Joe

23 years, 1 month

HP 7905/7906 ???

by rigdonj＠cfl.rr.com

Any body on here seriously interested in the HP 7905 and 7906 disk drives? Joe

23 years, 1 month

Reading a VMS CD-ROM for SIMH under Windows?

by vp＠mcs.drexel.edu

--- Ethan Dicks <erd_6502(a)yahoo.com> wrote: > There is no way any of this will make him see the light about Linux > or UNIX or anything... he's an HP Customer Engineer on assignment > with a company laptop and a Digital Personal Alpha Workstation (VMS) > by his desk (no CD-R drive). Although I don't think this will help this particular guy, I would like to say that I have solved the usual "Do I run Windows or {Linux,*BSD} on my laptop" dilema by running both at the same time under VMware. I have installed OpenBSD on a separate partition (so that I can boot native if I have to), but I mostly boot Windows 2000 and run OpenBSD under VMware. I can then run a Windows-based X-Server (eXceed) and talk to the OpenBSD, and even use samba (on the OpenBSD) to mount filesystems from the Windows side. VMware allows direct access to devices (e.g. CDROM, USB,e tc) which means that I can mount any kind of CD and access it using Unix tools). OpenBSD can even see the network so that I can run ssh, IPsec etc from the OpenBSD environment rather than messing with the Windows equivalents. (like I said this is general FYI, which may or may not be particularly applicable to that particular guy). **vp

23 years, 1 month

Jump to page:

2026

2025

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