test-drb December 1999

test-drb@ccmp.vtda.org

186 participants
742 discussions

by pete＠dunnington.u-net.com

On Dec 6, 18:21, Jean-Pierre Hofer wrote: > I am looking for specifications of the old V.23 protocol, or general > informations about this. It's a CCITT modem standard for half-duplex asynchronous communication at 600 or 1200 baud (one direction, on the forward channel) with a 75 baud back channel. Because the back channel is not just used for signalling, it somtimes used to be called "asymmetric duplex". It's an FSK system, the forward channel uses 1300Hz/1700Hz tones for 600 baud, or 1300Hz/2100Hz tones for 1200 baud; the back channel uses 390Hz/450Hz. The lower frequency is used for MARK and the higher for SPACE. The standard also specifies the answer tone frequency (2100Hz) and some timing but I can't remember the details. -- Pete Peter Turnbull Dept. of Computer Science University of York

25 years

DEC LA-180 and PDP8e/LC8-E

by ethan_dicks＠yahoo.com

--- Eric Smith <eric(a)brouhaha.com> wrote: > > I recently got my hands on a classic DEC LA-180 RO... I didn't know the LA180 ever came with a keyboard. My knowledge of the LA180 is that it was badged "DECprinter I" and came with a 40-pin parallel interface. > You need a KL8-E or the like, not an LC8-E. The LC8-E is a parallel > interface, and the LA180 is a serial device. I have the OMNIBUS card for the LA180; I'd check the handle number, but I'm not where it is. It is most assuredly a parallel device. Perhaps you are thinking of the LA120? It was badged "DECwriter III". It _was_ serial, with a four-digit LED display by the keyboard for set-up and status info. I got my first LA180 because Newman Computer Exchange sent me a ticket for free shipping on my next order. I figured that an LA180 was the heaviest thing I would ever want from them. The printer came in handy a couple of years later when I was doing PDP-11 contract work in my basement - PDP-11/23, RLV11, LPV11 and a bunch of my old PDP-8 peripherals. Made my living for nearly two years off that stuff. Out-of-pocket expense in 1988: $300 for the PDP-11 (salvage from my day job), $100 for the RLV11 (used from a reseller). Very cost effective to me. -ethan ===== Infinet has been sold. The domain is going away in February. Please send all replies to erd(a)iname.com __________________________________________________ Do You Yahoo!? Thousands of Stores. Millions of Products. All in one place. Yahoo! Shopping: http://shopping.yahoo.com

25 years

Nostalgic note [Was: Re: Amiga 500, 2000 serial ports: The same?]

by yoda＠isr.ist.utl.pt

I can't help commenting on this: I was a big Amiga computers fan, I used them for a long time, they felt like an interersing alternative to the PC/DOS/Windows hegemony. I believed they had a superior technological background. But as the years went by, I had to recognize that it was no longer a fact, and that the PC/Linux combination advanced at a much higher rate, than the Amiga, that basically remained still, both in hardware and software terms. I can't help feeling nostalgic for reading posts about Amiga computers in this Classical Computers mailing list... Cheers, -- *** Rodrigo Martins de Matos Ventura <yoda(a)isr.ist.utl.pt> *** Web page: http://www.isr.ist.utl.pt/~yoda *** Teaching Assistant and MSc Student at ISR: *** Instituto de Sistemas e Robotica, Polo de Lisboa *** Instituto Superior Tecnico, Lisboa, PORTUGAL *** PGP fingerprint = 0119 AD13 9EEE 264A 3F10 31D3 89B3 C6C4 60C6 4585

25 years

Looking for...

by netsurfer_x1＠hotmail.com

I am looking for the following items. (Get ready, this is going to be a pretty varied list!) ----Pictures of Computers---- Commodore Hyperion (looks like a Dynalogic Hyperion, & could be the same thing?) TI-99/7 (Proposed, but never released. May never have entered the prototype stage.) TI-99/4B (not a typo! See above comment.) Commodore PC-5 (Predecessor of the [in]famous PC-10 series, no other information known.) Commodore TOI (also known to be called the Commodore 8033 or the Color PET.) ----Software---- If somebody could provide me with cpoies of the following software, , e-mail me ASAP! SmoothTalker, from First Byte, for Macintosh (on an 800K disk only!) Elite for Commodore 64. ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

25 years

Everyone here should read this.. I thought I'd seen everything.

by dylanb＠sympatico.ca

-----Original Message----- From: Ethan Dicks <ethan_dicks(a)yahoo.com> To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Date: Monday, December 06, 1999 7:48 PM Subject: Re: Everyone here should read this.. I thought I'd seen everything. > > >--- John B <dylanb(a)sympatico.ca> wrote: >> BTW: Has anyone heard of a PDP-8/A500 ??? what is that? > >It happens to be the first model I ever laid hands on... KK8A, KM8A, DKC8AA >(the standard -8/a stuff), 12-slot box (the 20-slot box was for stuff like >the PDP-8/a 620). I am pretty sure (it's been a while) that the -8/a 500 >has a core-capable power supply. Lower stuff, like the -8/a 320, could only >take MOS memory (MS8C, et al.) > >I've only ever seen the 12-slot PDP-8/a boxes myself, but a couple of >flavors of them. I was told this mini was filled with core memory, has a bunch of RK05 packs, an rx01 and another thing they called a "panel box"- expander? > >-ethan > > >===== >Infinet has been sold. The domain is going away in February. >Please send all replies to > > erd(a)iname.com >__________________________________________________ >Do You Yahoo!? >Thousands of Stores. Millions of Products. All in one place. >Yahoo! Shopping: http://shopping.yahoo.com >

25 years

Scrap value of machines (was Re: ebay feedback)

by dylanb＠sympatico.ca

-----Original Message----- From: Richard Erlacher <edick(a)idcomm.com> To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Date: Monday, December 06, 1999 7:16 PM Subject: Re: Scrap value of machines (was Re: ebay feedback) >It's pretty obvious, then, isn't it, that the place to be is on their side >rather than bidding against them? Even if you have to pay a little more or I wish that would work but *most* of them don't care if you are going to put down a few thousand on a mini. (notice the few thousand now)... They deal in volume and don't care what you are looking for.. well, at least the big guys. >work a little more, it's better to be in a position to call the guy up on a >free morning and ask whether he's got anything new that you'd like to look >at, isn't it? > This works with smaller scrappers but they rare;y get the juicy stuff. I like a scrapper that goes into an old factory and levels it. The big scrappers get cool toys all the time. >Dick >-----Original Message----- >From: Christian Fandt <cfandt(a)netsync.net> >To: Discussion re-collecting of classic computers ><classiccmp(a)u.washington.edu> >Date: Monday, December 06, 1999 9:07 AM >Subject: Re: Scrap value of machines (was Re: ebay feedback) > > >>Upon the date 12:58 AM 12/6/99 -0800, Mike Ford said something like: >>>>Where can you find out what the gold/aluminum/steel value of a >>>>computer at? The obvious solution is to know what a scrapper is >>>>willing to pay, and add $10 to your bid. A scrapper will never >>>>spend more to buy something than it is worth, a collector will. >>> >>>Not a good assumption. A scrapper might be willing to spend whatever it >>>took to make you never get a winning bid and just go away. >> >>Yes, an appropriate correlation is that if they can crush computers (before >>shredding the carcass) then they can cru$h you. >> >>Their profits drop corresponding with losses of bids so they're going to >>spend extra in the short term to protect their profits in the long term. >> >>Regards, Chris >>-- -- >>Christian Fandt, Electronic/Electrical Historian >>Jamestown, NY USA cfandt(a)netsync.net >> Member of Antique Wireless Association >> URL: http://www.antiquewireless.org/ > >

25 years

Everyone here should read this.. I thought I'd seen everything.

by ethan_dicks＠yahoo.com

--- John B <dylanb(a)sympatico.ca> wrote: > BTW: Has anyone heard of a PDP-8/A500 ??? what is that? It happens to be the first model I ever laid hands on... KK8A, KM8A, DKC8AA (the standard -8/a stuff), 12-slot box (the 20-slot box was for stuff like the PDP-8/a 620). I am pretty sure (it's been a while) that the -8/a 500 has a core-capable power supply. Lower stuff, like the -8/a 320, could only take MOS memory (MS8C, et al.) I've only ever seen the 12-slot PDP-8/a boxes myself, but a couple of flavors of them. -ethan ===== Infinet has been sold. The domain is going away in February. Please send all replies to erd(a)iname.com __________________________________________________ Do You Yahoo!? Thousands of Stores. Millions of Products. All in one place. Yahoo! Shopping: http://shopping.yahoo.com

25 years

Any GRID experts out there?

by edick＠idcomm.com

I went through the same exercise after finding that their connector was different from the "standard" dot martix displays they listed, or some other obvious deviation from the norm. I got nowhere. I checked with GRID, since they were still alive then, and, likewise, got nowhere. Dick -----Original Message----- From: Arfon Gryffydd <arfonrg(a)texas.net> To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Date: Monday, December 06, 1999 2:44 PM Subject: Re: Any GRID experts out there? >>I bought this thing to use as a display for a test intstrument I was >>developing as a mental masturbation exercise, but quickly went back to a CRT >>after running into trouble getting any kind of definitive interface spec. I >>might still use it for something some day if the data comes my way, but I'm >>really not looking for more projects. >> >>Have you got any interface specifications for this beastie, or do you know >>where they might be available? > > >I contacted several offices of Hitachi because at the time, I thought my >GRiD was irrepairable. I can tell you that after spending many corporate >dollars (for my personal project (Thanks, LiteOn!)), if Hitachi has specs >on that beastie, they are not releasing them. I contacted the division >that handles those displays and though I called them repeatedly, they never >returned any of my calls. > >If you can ever find the spec.s, I would sure like a copy! > >A >---------------------------------------- > Tired of Micro$oft??? > > Move up to a REAL OS... >######__ __ ____ __ __ _ __ # >#####/ / / / / __ | / / / / | |/ /## >####/ / / / / / / / / / / / | /### >###/ /__ / / / / / / / /_/ / / |#### >##/____/ /_/ /_/ /_/ /_____/ /_/|_|#### ># ###### > ("LINUX" for those of you > without fixed-width fonts) >---------------------------------------- >Be a Slacker! http://www.slackware.com > >Slackware Mailing List: >http://www.digitalslackers.net/linux/list.html

25 years

DEC LA-180 and PDP8e/LC8-E

by ethan_dicks＠yahoo.com

--- Rick Bensene <rickb(a)bensene.com> wrote: > Hello, all, > > I recently got my hands on a classic DEC LA-180 RO (receive > only) printer. > There's a second board, that connects to the main electronics > board via a ribbon cable. This board has an old AY5-1013 UART > chip, and a bunch more TTL on it, and appears to be a serial > interface. Ah. This paragraph wasn't copied in the other message I just replied to... I've never seen this option, but, with something like this in place, that explains the questions about serial. > I want to try to connect this up to my PDP8/e system as print device. > The LC8-E card has a Berg connector that is identical to the Berg > connector on the printer electronics board of the LA-180. Check which pins are in use. DEC used the 40-pin Berg connector in just about everything. > I'm wondering if the 'parallel' interface of the LA-180 is compatible > with the LC8-E card... It's a pretty simple interface. According to the 1978 Microcomputer Handbook, the parallel out on the DKC8AA can be used to drive an LA180 with two caveats: the data is inverted, and the IOP instructions are different. Electrically, though, they are compatible. It's little more than 8-bits, a couple of handshake lines and a couple of status lines. > ...I don't have printsets for the > LC8-E card, so I don't know the pinout of the connector for the > printer, nor do I have any information at all on the LA-180 in > terms of the 'parallel' port interface of the printer. I don't have any prints on my ONMIBUS LA180 parallel card, but I do have prints for the LA180 (and the DKC8AA) > Obviously, I'm not going to just plug it in and see what happens :-) If all is TTL, nothing *bad* should happen, but your caution is reasonable. > Anyone out there know if this will work? If so, is a special > cable needed, or will a 'straight through' cable work? *If* the LC8-E is the LA180 parallel interface, a straight cable is what you want. I'd check the handle number of my own card, but I can't do that until tomorrow night. -ethan ===== Infinet has been sold. The domain is going away in February. Please send all replies to erd(a)iname.com __________________________________________________ Do You Yahoo!? Thousands of Stores. Millions of Products. All in one place. Yahoo! Shopping: http://shopping.yahoo.com

25 years

Any GRID experts out there?

by edick＠idcomm.com

Yes, it's about that size. (One can interpret the "size" in quite a number of ways.) I bought this thing to use as a display for a test intstrument I was developing as a mental masturbation exercise, but quickly went back to a CRT after running into trouble getting any kind of definitive interface spec. I might still use it for something some day if the data comes my way, but I'm really not looking for more projects. Have you got any interface specifications for this beastie, or do you know where they might be available? Dick -----Original Message----- From: Arfon Gryffydd <arfonrg(a)texas.net> To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Date: Monday, December 06, 1999 12:42 PM Subject: Re: Any GRID experts out there? >It sounds like my GRiD 1530 display... Made by hitachi... two slider pots >(on the sides)... Monochrome... Dose it have about a 10.5" (diagonal) >display area??? > >At 09:08 AM 12/4/1999 -0700, you wrote: >>This thing has got to be at least 10 years old, but, here goes . . . I was >>scrounging through some boxes in my basement this morning . . . and found a >>flat-panel display module, probably monochrome, with the label LM758CXAGNR >>and the HITACHI brand name emblazoned on it. It has a couple of slide pots >>hanging from it, each bearing the name GRID in its silkscreen. >> >>Is any of you folks familiar enough with devices of this type or familar >>enough with GRID to steer me onto some information about how one might use >>this display panel for something useful? >> >>thanx >> >>Dick >> >> >> >---------------------------------------- > Tired of Micro$oft??? > > Move up to a REAL OS... >######__ __ ____ __ __ _ __ # >#####/ / / / / __ | / / / / | |/ /## >####/ / / / / / / / / / / / | /### >###/ /__ / / / / / / / /_/ / / |#### >##/____/ /_/ /_/ /_/ /_____/ /_/|_|#### ># ###### > ("LINUX" for those of you > without fixed-width fonts) >---------------------------------------- >Be a Slacker! http://www.slackware.com > >Slackware Mailing List: >http://www.digitalslackers.net/linux/list.html

25 years

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test-drb December 1999