test-drb

test-drb@ccmp.vtda.org

101090 discussions

by lee＠geekdot.com

> Hmm... Having said all that, it might be possible to put a state > machine into a 16V8 that had a 7 bit current state and a next state > function that corresponded to "counting" is seven segments. It was just that that I've seen an example of, many years ago, but can't find now. Lee.

18 years, 4 months

Almost OT: Pushbutton switch latching

by lee＠geekdot.com

> 8 74xx30's (8 input NAND) with each output feeding one of the inputs > of the other stages. That was my first thought but a quick look at the logic revealed that pressing one button will make only one of the other seven outputs go low. Lee.

18 years, 4 months

Information on the AtariLab Interface

by chaosotter76＠gmail.com

It took me longer than I meant to, but I dug up the manual for the AtariLab package that I'd mentioned in the thread on getting kids into older computers. In case you weren't reading that discussion, the AtariLab system was a science kit for the Atari 8-bit home computers that included a cartridge, an interface box that plugs into the joystick port, and a variety of measurement probes. Atari must have manufactured them far in excess of demand (no! not Atari!), because they're still fairly inexpensive NIB. At any rate, here's the scoop on the interface box: it has 8 phono jacks on it, arranged into 4 pairs: PADDLE, PTRIG, CONTROL, and POWER. The PADDLE inputs are the analog inputs; they're simply expecting to see a variable resistor on the other end, just as you'd except. The PTRIG inputs are digital inputs corresponding to the joystick fire buttons. The CONTROL jacks are indeed digital outputs (this was the question that came up in the original thread). They are wired to the UP and DOWN pins of the connector -- the Atari joystick interface can be programmed to use these pins for output rather than input, it seems. You must use controller jack 3 or 4 on the original 400/800 and 1 or 2 on the XL series. The PTRIG inputs can be reversed in the same way, giving you a total of four digital output lines per interface. The POWER outputs are just connected to the +5V supply of the joystick interface. The manual doesn't indicate how much current you can draw from the interface, but I imagine it's not much. So there you have it: 2 analog inputs, 2 digital input/outputs, 2 digital outputs, and 2 power connections.

18 years, 4 months

TRADIC

by evan＠snarc.net

For me, this is exciting because the early transistor research was (to a large extent) encouraged and funded by the Army Signal Corps lab that is now the home of our computer museum. Yes, Will D., we know for FACT that it was our lab and not just the ASC in general. Will likes to keep us on our toes. :) Speaking of which -- sorry for the thread hijack -- at the next VCF East we will have a special exhibit of all the computer history that happened or that was directly related to our lab. Bush, Mauchly, Hewlett, Vollum, Shockley -- they all are part of our history here. (Which makes it quite fun for us to roam the hallways looking for ghosts!) -----Original Message----- From: Brent Hilpert <hilpert at cs.ubc.ca> Subj: Re: TRADIC Date: Sat Dec 8, 2007 2:04 am Size: 1K To: General at priv-edmwaa05.telusplanet.net; "Discussion at priv-edmwaa05.telusplanet.net":On-Topic and Off-Topic Posts<cctalk at classiccmp.org> Evan wrote: > > A few days ago, someone asked about TRADIC. Tonight I stumbled upon a mention of this computer on page 204 of the book "Crystal Fire" (Michael Riordan and Lillian Hoddeson, 1997). The authors wrote, "In January 1954 Whippany engineers built a fully transistorized computer for the Air Force. Called TRADIC (for TRAnsistorized DIgital Computer), it used 700 point-contact transistors and more than 10,000 germanium crystal rectifiers in its circuits. Capable of performing a million logical operations every second, TRADIC was the first completely solid-state computer; it approached the speed of computers based on vacuum tubes." > > By "Whippany" they meant the Whippany, N.J. location of Bell Labs. TRADIC is a well-known machine in the history of computing. A little googling does bring up a lot of refs. (I think there's another experimental/proof-of-concept machine commonly mentioned as being one of the first transistorised machines (something from Philco perhaps?).) Another anecdote I ran across a few years ago in the IEEE AotHoC (which I wish had kept a ref to), was of an IBM engineer working on one of the first transistorised designs in the mid-50s (ECL IIRC), telling the story of how he chose 5 Volts for the logic supply.

18 years, 4 months

OT: Vintage sighting

by cclist＠sydex.com

I'll make this quick--I just saw a rerun of a 1970 "Mission Impossible" episode called "The Innocent". The computer there definitely looks to be Univac; I'm guessing an 1106. Anyone else see this one? ...and who has a reference manual for KAZAN IV? Cheers, Chuck

18 years, 4 months

HP250 curiosity

by cclist＠sydex.com

I was going through some of my old literature and stumbled upon a discussion of the HP250 architecture. One statement made was that it was impossible for the customer to write his own binary executables on this system. The idea being that the customer would program everything in HP BASIC, I imagine. Out of curiosity, was this restriction ever relaxed? How many people have one of these in their collection? Cheers, Chuck

18 years, 4 months

OT: Need Sparcstation 5 rescue

by us21090＠yahoo.com

All- In an appeal to avoid the crusher.... I've got an SUN/Sun Sparcstation 5, GDM-1662B monitor (16" specs say, 1280 x 1024, color), 13W3 video cable, keyboard, mouse, 64 MB, 1 GB drive (I believe). I live near BWI, Maryland. If you know someone (who knows someone)* who would like this system, let me know. BTW, that previous line is a joke of sorts for the regular expressionists among us. I'd prefer a local pickup, but will ship on your nickel. Thanks, Scott ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ

18 years, 4 months

Torode disk controller for the S-100

by dwight＠svdc-imap00.amd.com

Hi Bob Do you remember the S-100 controller and disk drives I talked you into buying last year? I recently dug up some more interesting information. I've actually found someone that has a manual. This is a find. These controllers are really quite rare. Manuals are even rarer. Second thing is that these Digital Systems controllers were designed by Torode. These were the first S-100 floppy system that Kildall release a packaged CP/M for. I knew these were early controllers but didn't realize the history of them. Dwight

18 years, 4 months

Northgate OmniKey Ultra

by jkbla＠sbcglobal.net

Hi, I saw this whilst doing some searches. Do you still have it? Response appreciated. Thanks

18 years, 4 months

CNN front page: Commodore 64

by dzubint＠vcn.bc.ca

So, I turn on the computer this morning, go to www.cnn.com to see the latest Britney Spears news ('cause CNN reports on ALL of the important stuff like that) and what do I see on the front page? A Commodore 64 story! http://www.cnn.com/2007/TECH/ptech/12/07/c64/index.html Thomas "PDP-11" Dzubin Calgary, Vancouver, or Saskatoon

18 years, 4 months

Hazeltine 1200

by ploopster＠gmail.com

My father just rescued a Hazeltine 1200 from a scrapheap for me. I know nothing about these. Could someone give me some pointers to information? Thanks. Peace... Sridhar

18 years, 4 months

Free "museum pieces" in London

by lproven＠gmail.com

A message I spotted on the CIX online service... [[ >From Hex Museum pieces Before they go into a skip, does anyone want: Amstrad PC1512 with dual floppies BBC model B with microvitec monitor and twin 5.25" floppies Epson EX-100 132-column printer Epson FX-80 Sinclair ZX Printer Collect from Edgware, nw London. Feel free to copy this elsewhere. If you want anything, email robert at schifreen dot co dot uk ONLY. ]] -- Liam Proven ? Profile: http://www.linkedin.com/in/liamproven Email: lproven at cix.co.uk ? GMail/GoogleTalk/Orkut: lproven at gmail.com Tel: +44 20-8685-0498 ? Cell: +44 7939-087884 ? Fax: + 44 870-9151419 AOL/AIM/iChat: liamproven at aol.com ? MSN/Messenger: lproven at hotmail.com Yahoo: liamproven at yahoo.co.uk ? Skype: liamproven ? ICQ: 73187508

18 years, 4 months

Offered: Free Macs, London, England

by lproven＠gmail.com

I'm trying to have a clear out and I think it's time most of the legacy Mac stuff went. I have: - 2 LC 475s (one dead, one alive, as far as I can recall) - one PowerMac 6100/66 (runs but has a blank hard disk) - one Beige G3 minitower (300MHz, CD, Zip, 8GB HD) - UMAX PPC604 Mac compatible minitower machine I've also got at least 1 21" mono Mac monitor with accompanying mono NuBus graphics card, 1 or 2 14" Apple colour monitors, and a couple of boxes of classic Mac apps. Anyone who wants any or all of these machines, including some free apps to go with them, is welcome to come and rummage. -- Liam Proven ? Profile: http://www.linkedin.com/in/liamproven Email: lproven at cix.co.uk ? GMail/GoogleTalk/Orkut: lproven at gmail.com Tel: +44 20-8685-0498 ? Cell: +44 7939-087884 ? Fax: + 44 870-9151419 AOL/AIM/iChat: liamproven at aol.com ? MSN/Messenger: lproven at hotmail.com Yahoo: liamproven at yahoo.co.uk ? Skype: liamproven ? ICQ: 73187508

18 years, 4 months

Need NDIS2SUP.386 file for Windows for Workgroups

by sellam＠vintagetech.com

Ok, I give up. I've searched high, low, sober, etc., and cannot find one single solitary instance of the file NDIS2SUP.386. It is supposedly on Disk 7 of the WFWG install set. I have a set that has 8 disks but the file is nowhere to be found on any of them. I've found references to the file WG0971.EXE which should be a self-extracting file that contains NDIS2SUP.386 but it cannot be found, not even where it should be on Microsoft's FTP server. I spent hours on Google and it is not there. Maybe someone else has more Google foo than me, and you're welcome to try, but I'll bet someone out there has this file. If so, PLEASE e-mail me directly to let me know. Thanks a thousand times in advance and may all your dreams be naughty. -- 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 ]

18 years, 4 months

HP 9000/216

by pat＠computer-refuge.org

I finally decided to pick up the HP 9000/216 box which had been laying around at my usual supplier for a few weeks. I spent a little time looking at google, and can't find much info on them. >From physical examination, it looks like it has a 1MB and a 256kB expansion memory card (so 1.5MB total), and a fairly large keyboard, which is different than the "standard" keyboard that comes with it (it includes a dial at the top left, and has grey keys instead of brown). I was wondering if these are actually somewhat rare, or if they're just not very well sought-after. If anyone is interested in giving me some $$ for one or has something interesting (mostly old DEC), feel free to bother me about it. Pat -- Purdue University Research Computing --- http://www.rcac.purdue.edu/ The Computer Refuge --- http://computer-refuge.org

18 years, 4 months

Free "museum pieces" in London

by mike＠brickfieldspark.org

> From: Pete Turnbull <pete at dunnington.plus.com> > Subject: Re: Free "museum pieces" in London > > I'm pretty sure it is, and that might even be the Beeb he used. I have > the modem :-) > >> robert at schifreen dot co dot uk schifreen dot co dot uk goes to http://www.defeatingthehacker.com/securitysavvy/ Which states - " In 1985, Robert became the first person in the world to face a jury trial in connection with computer hacking. His ultimate acquittal on all charges led to the introduction of the UK's Computer Misuse Act 1990, which now outlaws the practice. " Mike

18 years, 4 months

Almost OT: Pushbutton switch latching

by dm561＠torfree.net

Message: 17 Date: Thu, 06 Dec 2007 18:16:44 -0500 From: "Roy J. Tellason" <rtellason at verizon.net> Subject: Re: Almost OT: Pushbutton switch latching To: "'cctalk at classiccmp.org'" <cctalk at classiccmp.org> Message-ID: <200712061816.44523.rtellason at verizon.net> Content-Type: text/plain; charset=iso-8859-1 On Thursday 06 December 2007 11:24, M H Stein wrote: >> Date: Wed, 05 Dec 2007 17:55:51 -0800 >> From: "Chuck Guzis" <cclist at sydex.com>> >> Subject: Re: Almost OT: Pushbutton switch latching >> >> (No "almost" about it any more...) >> >> >On 5 Dec 2007 at 17:35, Fred Cisin wrote: >> >> . . . then I guess that a rotary telephone dial is out of the question >> > >> >Oooh, cool--Strowger switches! > >> ------------- >> Pshaw; a mere 10 positions? I've got a 25-step 12-pole stepper here, >> just the ticket. Expandable? I'll say; add one of your 10-steps and you've >> got 250 positions. >(Trying to picture a 25-hole old-style telephone dial... :-) ------------- Think bigger - the interrupter doesn't care how many! Or dial 10 at a time... m

18 years, 4 months

Almost OT: Pushbutton switch latching

by dkelvey＠hotmail.com

> From: ian_primus at yahoo.com > > I guess I should have been more clear... And everyone > has brought up some good points. I initally didn't > think about the initial power-up setting, but in this > application it doesn't much matter - I guess > defaulting to none pressed (or #1 pressed, even > better) would be good. I don't intend to press two > switches at once, but if it were to happen, it doesn't > much matter - either one could take priority. I'd > rather not have more than one select output active at > a time, but it's not a huge problem if it happens. > Timing is totally non-critical. Two outputs can be > active for a tiny period, no outputs active during > switching is fine. The idea is to simply control some > CBT3244A bus switching chips to switch some analog > signals. I want to avoid having each chip controlled > by a toggle on/off switch, because then in order to > change signals you would have to manually turn off > one, and turn on the next. > > The main thing I'm trying to achieve is simplicity. > Nothing fancy. No PIC's, no microcontrollers, etc. I > initially thought of using flip flops and a bunch of > inverters to reset all the non-selected flip flop, but > couldn't work out in my head a good way to do it... I > hadn't taken switch debouncing into the equation - but > aren't flip flops commonly used to debounce switches > anyway? > Hi The simplest method would be to use the cross coupled nands as another described. For 8 inputs, you'll need 4 ea 7400's to make the nand latches. You'l need 8 ea 8 input nands ( forget the 74 number ) and 3 of the hex inverters, 7404s. For each switch wire one lead to ground. Wire one lead to a 4.7K pullup resistor and one of the free inputs to the cross coupled nand pair. Also wire that switch lead to 7 of the 8 input nands ( not the one on this switch circuit. ). On the remaining free inputs to the cross coupled nands pair, wire an inverters output. The input of the inverter goes to the output of the 8 input nand that wasn't one of the 7 connected to this switch. Repeat this for each of the 8 switches. If the active level is to be 0 when selected, you can save one inverter IC. If it needs to be active high, you need the inverter. in either case, you need to connect to the nand that has the inverter to the 8 input nand. This will ensure that multiple switches won't select anything until only one is selected. On the 8 input nand, you'll notice that one input isn't connected. This can be used to reset. Tie all together with a 1K resistor to +5. Place a diode across this such that the band is on the +5 ended. Add a 10uf tantalum to this net with th plus on the same net and the negative to ground. This will reset all on powering up. If you want to one of the outputs to come on when powering up, you can add a similar capacitor, resistor and diode circuit to the desired input switch lead. You'd need to remove the common input to the 8 input nand and tie it to +5 as well. I like this better than using some other clocked method because if multiple switches are selected at the same time, non will select but when the last switch is still selected, that output will go active. There are no ambiguous states and no oscillations. The switches are debounced as well. Dwight _________________________________________________________________ Connect and share in new ways with Windows Live. http://www.windowslive.com/connect.html?ocid=TXT_TAGLM_Wave2_newways_112007

18 years, 4 months

Tandy with expansion for jay

by g-wright＠att.net

-------------- Original message from "Jay West" jwest at classiccmp.org>: --------- Jay I have walked over this tandy long enough. send me your address Before is heads out the door. - Jerry Jerry Wright JLC inc g-wright at att.net

18 years, 4 months

Almost OT: Pushbutton switch latching

by dm561＠torfree.net

Date: Wed, 05 Dec 2007 17:55:51 -0800 From: "Chuck Guzis" <cclist at sydex.com> Subject: Re: Almost OT: Pushbutton switch latching (No "almost" about it any more...) >On 5 Dec 2007 at 17:35, Fred Cisin wrote: >> . . . then I guess that a rotary telephone dial is out of the question >Oooh, cool--Strowger switches! ------------- Pshaw; a mere 10 positions? I've got a 25-step 12-pole stepper here, just the ticket. Expandable? I'll say; add one of your 10-steps and you've got 250 positions. mike

18 years, 4 months

Hazeltine 1200

by ajp166＠bellatlantic.net

> >Subject: Hazeltine 1200 > From: Les Hildenbrandt <les at hildenbrandt.com> > Date: Thu, 06 Dec 2007 07:40:14 -0700 > To: cctech at classiccmp.org > >My first computer came with a Hazeltine 1000, this was older than the >1200. It had 80 characters wide, but I think it only was 12 lines tall, I remember it as 72 (tty width). >I cant remember that part for sure. What I remeber for sure was that it >was upper case only. There was a place of the PCB for a second >character generator rom for lower case which was not loaded. There was >also a switch on the front which enabled lower case for the keyboard. >That was very confusing because sometimes I was typing in lower case, >then when I did a search or search / replace in ed it couldn't find what >I was searching for because it was upper case. I didn't figure that out >until later when I got an intertube terminal to replace the Hazeltine 1000. ;) Allison >Les

18 years, 4 months

Hazeltine 1200

by ajp166＠bellatlantic.net

> >Subject: Re: Hazeltine 1200 > From: Sridhar Ayengar <ploopster at gmail.com> > Date: Thu, 06 Dec 2007 10:09:00 -0500 > To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> > >Allison wrote: >>>> My father just rescued a Hazeltine 1200 from a >>>> scrapheap for me. I know >>>> nothing about these. Could someone give me some >>>> pointers to >>>> information? Thanks. >>>> >>> Nice! I don't know anything about the 1200, but I have >>> a 1500 and a 1421. They are both just simple >>> terminals, with some fairly basic control functions >>> What does it look like? Is the keyboard integral or >>> detatched? Does it look like the 1500/1400 series? - >> >> The 14xx and 15xx are late 70s (after 1976) as 1500 used >> 8080 and the 1400 used 8048 cpus. > >Interesting. 8048 is an integrated microcontroller, no? Yes but it has an external databas and addressing for extended configurations. Basically a subset of 8051. Allison >>> http://vt100.net/manx/covers/14/hi-1056a.png. >>> >>> Now, if it looks like the 2000, you've got a great >>> score. Those are some interesting beasts. I've never >>> seen one, but they look like this. >>> http://www.columbia.edu/acis/history/h2000s.gif >>> >>> The Hazeltine 2000 was a very early video terminal >>> (circa 1972). >> >> The 1200 was a basically glass tty, all uppercase >> (may have had a back pannel option for all upper >> tty mode or mixed) it was capable of slow baud rates >> (I think to 1200 or 4800) and both RS232 or current >> loop. I used on on the DEC PDP10 so that means it >> was in house there by spring 1972. It was all logic >> no cpu used and I belive it used serial PMOS shift >> registers for storage. > >Wow. Neato! > >Peace... Sridhar

18 years, 4 months

Hazeltine 1200

by ajp166＠bellatlantic.net

> >Subject: Re: Hazeltine 1200 > From: Dave McGuire <mcguire at neurotica.com> > Date: Thu, 06 Dec 2007 09:24:29 -0500 > To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org> > >On Dec 5, 2007, at 10:02 PM, Sridhar Ayengar wrote: >>>> My father just rescued a Hazeltine 1200 from a scrapheap for me. >>>> I know nothing about these. Could someone give me some pointers >>>> to information? Thanks. >>> Nice! Let us know the date codes on the chips when you get a chance >>> to peek inside. >> >> Will do. > > I'm also curious about what processor it's built around, if you >don't mind checking. Best of my knowledge only the 15xx and 24xx serius used a processor and the earlier ones wer random logic and simple state machines. Allison > > -Dave > >-- >Dave McGuire >Port Charlotte, FL >Farewell Ophelia, 9/22/1991 - 7/25/2007 > >

18 years, 4 months

Hazeltine 1200

by ajp166＠bellatlantic.net

> >Subject: Re: Hazeltine 1200 > From: Dave McGuire <mcguire at neurotica.com> > Date: Thu, 06 Dec 2007 10:33:17 -0500 > To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org> > >On Dec 6, 2007, at 10:09 AM, Sridhar Ayengar wrote: >>>>> My father just rescued a Hazeltine 1200 from a >>>>> scrapheap for me. I know nothing about these. Could someone >>>>> give me some >>>>> pointers to information? Thanks. >>>>> >>>> Nice! I don't know anything about the 1200, but I have >>>> a 1500 and a 1421. They are both just simple >>>> terminals, with some fairly basic control functions >>>> What does it look like? Is the keyboard integral or >>>> detatched? Does it look like the 1500/1400 series? - >>> The 14xx and 15xx are late 70s (after 1976) as 1500 used >>> 8080 and the 1400 used 8048 cpus. >> >> Interesting. 8048 is an integrated microcontroller, no? > > Yes it is; sorta a predecessor to the 8051 family. Yes, and it can also address up to 4k of program either internal (up to 2K for the 8049) and axternal. It's possible to hand external ram on it as well but the pointer is only 8bits so larger ram has to be paged using IO pins. Allison > -Dave > >-- >Dave McGuire >Port Charlotte, FL >Farewell Ophelia, 9/22/1991 - 7/25/2007 > >

18 years, 4 months

Almost OT: Pushbutton switch latching

by ian_primus＠yahoo.com

This should be a much simpler problem than I'm making it, but at the moment my brain doesn't want to come up with a solution. Picture this - a number of switches, say, eight. Momentary contact, normally open switches. And then eight outputs, one for each switch, TTL level. I want to be able to push one switch and bring it's corresponding output high, and have it stay high even when the switch is released. But, making this more complicated, I only want to be able to allow one switch to be active at a time. So, say switch four is pressed, output four is high. Then, switch one is pressed, and output four goes low, and output 1 goes high. Timing is not critical. I know this should be a simple array of flip flops, in some fashion, but at the moment, the solution eludes me. I feel like there is probably even a single/two chip solution to this. Now, I know that this is probably off-topic, but I'd be using this in on-topic hardware... -Ian

18 years, 4 months

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