Re: Quantum 2080 and 540 service manuals

2019-11-15 Thread Chuck Guzis via cctalk
On 11/15/19 2:21 PM, dwight via cctalk wrote: > Heads getting stuck on the ramp? > Maybe it has warn a groove in the plastic. It could be the bearings on the > head assembly as well. > Dwight Dunno--I only fire the thing up about once every 5 years or so... --Chuck

Re: Quantum 2080 and 540 service manuals

2019-11-15 Thread Chuck Guzis via cctalk
On 11/15/19 10:51 AM, allison via cctalk wrote: > I must have about 15 maybe more of the D540s and have found them > to be the fastest seeking of the MFM drives and also near unbreakable. > The oldest is about 36 years old. Use them in CP/M crates, DOS boxen, > PDP-11s (with RQDX2/3 controllers)

Re: Quantum 2080 and 540 service manuals

2019-11-15 Thread Chuck Guzis via cctalk
On 11/14/19 1:38 PM, Al Kossow via cctalk wrote: > These showed up on eBay, I'd been looking for them for over twenty years > > http://bitsavers.org/pdf/quantum/Q500/81-50466A_Q500_Technical_Reference_Manual_Sep1984.pdf >

Re: ge first transistors

2019-11-14 Thread Chuck Guzis via cctalk
On 11/14/19 11:53 AM, ben via cctalk wrote: > But then it takes a third party to take out of the lab make it public > like the transitor radio,or a transtorized computer or even hearing > aids. I like this place for transistor history. > http://www.semiconductormuseum.com/Museum_Index.htm > Ben.

Re: ge first transistors

2019-11-14 Thread Chuck Guzis via cctalk
On 11/14/19 10:26 AM, dwight via cctalk wrote: > My point was that lumping them all together is like lumping propeller plane, > jet planes and rockets as all the same. They all use the principles of > throwing mass in the opposite direction of desired motion. They are still > quite different

Re: ge first transistors

2019-11-14 Thread Chuck Guzis via cctalk
On 11/14/19 8:05 AM, dwight via cctalk wrote: > FETs come in to basic types, junction and MOS. Junction FETs can only be > depletion types but MOS can be both, depletion or enhancement. CMOS uses > enhancement types. The CuO was a depletion type junction FET. MOS is about as > different from a

Re: ge first transistors

2019-11-14 Thread Chuck Guzis via cctalk
On 11/14/19 6:22 AM, Paul Koning via cctalk wrote: > Neat. Speaking of old semiconductor history, I'd love to see again the > description (data sheet or magazine article, I'm no longer sure) that my > father had, about FETs made from copper oxide. Possibly before the 1940s, I > don't

Re: Question about modems

2019-11-13 Thread Chuck Guzis via cctalk
On 11/13/19 10:41 AM, Nigel Johnson via cctalk wrote: > > On 13/11/2019 13:36, Chuck Guzis via cctalk wrote: >> There are other "oddball" combinations, such as 8E1 and 8O1, which sends >> a 9-bit data frame.  You can see datasheets on some UARTs as well as MCU >

Re: Question about modems

2019-11-13 Thread Chuck Guzis via cctalk
There are other "oddball" combinations, such as 8E1 and 8O1, which sends a 9-bit data frame. You can see datasheets on some UARTs as well as MCU UARTs that support the 9 bit packet. Also, don't/doesn't TDD (5 level code) use 5E2 or some such. Same for Telex/TWX. --Chuck

Re: Anyone have docs/jumper settings for Tecmar "PC 500K/1MEG FLOPPY CONTROLLER" ISA card ?

2019-11-09 Thread Chuck Guzis via cctalk
On 11/7/19 4:04 PM, rescue via cctalk wrote: > > I have one of these, it has 2 jumper blocks, JPR2 (4 3 pin jumper > 'settings'... looks to probably latch each of the 4 high or low) and > JPR3 (12 on/off jumper positions). > It also has a JPR1 which would be a 3 pin header and it is strapped by

Re: Paleontological data fossilized on IBM 8" floppies

2019-11-03 Thread Chuck Guzis via cctalk
On 11/3/19 1:47 PM, Lyle Bickley wrote: > Antoine, > > It's not too difficult to read most "standard" 8" floppies (DEC RX02's being > the exception). The board below deals with both signal routing between 8" and > standard PC floppy interfaces and the "TG43" signal required by most 8" > drives:

Re: Estate sale

2019-10-30 Thread Chuck Guzis via cctalk
On 10/30/19 6:34 AM, Paul Koning via cctalk wrote: > > The Univac keyboard appears to be for a keypunch. I've seen keyboards that > look just like that (same distinct keycap shape) in a Burroughs mainframe > shop, circa 1974. I've used one of the Univac keypunches when the 029 was still the

Re: 50 yrs. ago today

2019-10-29 Thread Chuck Guzis via cctalk
On 10/29/19 5:50 PM, Jecel Assumpcao Jr. via cctalk wrote: > The ARPAnet was a WAN (wide area network) and not an Internet, but it > was one of the three networks involved in that first test on November > 22, 1977 (after a two network test the previous year). The option to use > TCP/IP in

Re: 50 yrs. ago today

2019-10-29 Thread Chuck Guzis via cctalk
On 10/29/19 4:19 PM, Fred Cisin via cctalk wrote: > None of the objections to "first inter computer communication" should > diminish the importance of the "first packet of the internet".  It was > surely a moment of rejoicing when it finally worked. I suspect that the first inter-computer

Re: 50 yrs. ago today

2019-10-29 Thread Chuck Guzis via cctalk
On 10/29/19 12:11 PM, ED SHARPE via cctalk wrote: > The historic event was comms between heterogenous computers over a > standardised protocol (IP, I think So, more properly--50 years of IP? --Chuck

Re: 50 yrs. ago today

2019-10-29 Thread Chuck Guzis via cctalk
On 10/29/19 11:39 AM, Rich Alderson via cctalk wrote: > > New to this list, are you? > EVERYONE knows that Steve Jobs invented the microcomputer and Nikola Tesla invented alternating current. --Chuck

Re: 50 yrs. ago today

2019-10-29 Thread Chuck Guzis via cctalk
On 10/29/19 11:53 AM, William Sudbrink via cctalk wrote: > Chuck Guzis wrote >> 50 years ago, inter-computer communication was common enough that it was >> a standard option in most vendors' catalogs. >> >> Maybe you've got a digit wrong? > > 500 years ago? A pair of abaci (or abacuses?) linked

Re: IBM 1500 [was RE: Vintage Computer Warehouse Liquidation]

2019-10-29 Thread Chuck Guzis via cctalk
On 10/28/19 12:14 PM, Rich Alderson via cctalk wrote: > The 1500 I worked with at the University of Texas School of Education was > based > on an 1800 (which is of course the same architecture as the 1130, but in > highboy > industrial cabinetry rather than a desk. Coursewriter II and APL\1500

Re: 50 yrs. ago today

2019-10-29 Thread Chuck Guzis via cctalk
On 10/29/19 6:15 AM, Murray McCullough via cctalk wrote: > The first inter-computer communication happened 50 years ago today. L. > Kleinrock part of that historic moment, said, and I paraphrase here, > ARPANET was the instrument that was to enable computers to talk to each > other remotely. He

Re: plated wire memory

2019-10-20 Thread Chuck Guzis via cctalk
On 10/20/19 1:50 PM, dwight via cctalk wrote: > It is funny that the most common memory used today is a DRO type memory. The > read destroys much of the charge on a DRAM cell, requiring a write back of > the data. > Dwight That's true today, but probably not in the near future. Persistent

Re: plated wire memory

2019-10-20 Thread Chuck Guzis via cctalk
On 10/20/19 7:43 AM, Al Kossow via cctalk wrote: > search for NDRO and thin film memory > Univac used it in their commercial and military computers > Apparently not for long. The 1107 was a thin-film memory machine, but the 1108 et seq. was not, IIRC. At least I don't recall any mention in the

Re: Unix v2 in PDP-7 assembly language

2019-10-19 Thread Chuck Guzis via cctalk
On 10/19/19 8:25 AM, Al Kossow via cctalk wrote: > > > On 10/19/19 4:14 AM, Toby Thain via cctalk wrote: > >> This is why I love hearing, so often, on these lists, "I have that >> stored in the basement somewhere". > > The rest of the story: > > - basement floods > - paper turns into a

Re: cctalk Digest, Vol 61, Issue 17

2019-10-18 Thread Chuck Guzis via cctalk
On 10/18/19 12:06 PM, Dr Iain Maoileoin via cctalk wrote: > > Chuck, I am Scottish, I have never been to Berkeley! I just cant remember > the history. I remember playing the game with a bunch of post-graduates. > I was either a post-grad or perhaps an early lecturer in the Uni. That > places

Re: looking for a program - last gasp questions

2019-10-17 Thread Chuck Guzis via cctalk
Was it in use at Berkeley? I might have it stashed away in some of my BSD-related tapes. --Chuck

Re: DIBOL manual

2019-10-15 Thread Chuck Guzis via cctalk
On 10/15/19 8:07 AM, Noel Chiappa via cctalk wrote: > I seem to recall that COBOL was the first language with support for > structures? If DIBOL has support for them too, which would be > another similarity between the two. Both FLOW-MATIC (1953) and COMTRAN (1957) had support for data

Re: Restoring dull BOT markers?

2019-10-14 Thread Chuck Guzis via cctalk
Oh, there are still a couple of the real (reel?) things available on eBay: https://www.ebay.ie/itm/650-SENSING-MARKERS-3M-FOR-OLD-COMPUTERS-IBM-APPLE-AND-OTHER-VERY-RARE-/151593837933

Re: Restoring dull BOT markers?

2019-10-14 Thread Chuck Guzis via cctalk
On 10/14/19 1:05 PM, Nigel Johnson via cctalk wrote: > I have a very old roll of this that I used to put on to 9 track mag tape > in the DEC world: > > https://www.ebay.com/itm/SCOTCH-65-7-32-X-100-NOS-ALUMINUM-FOIL-SPLICING-SENSING-TAPE-4-OPEN-REEL-DECKS-/192282792454 > > > It is not the

Re: Restoring dull BOT markers?

2019-10-14 Thread Chuck Guzis via cctalk
On 10/14/19 12:26 PM, Al Kossow via cctalk wrote: > > > On 10/14/19 9:32 AM, Daniel Seagraves via cctalk wrote: >> What’s the best way to restore a dull BOT marker > > replace it > > there were rolls of brady BOT tape on ebay but I don't see them now There are still people selling sensing

Re: DIBOL manual

2019-10-13 Thread Chuck Guzis via cctalk
On 10/13/19 2:46 PM, Noel Chiappa via cctalk wrote: > > From: Chuck Guzis > > > Calling DIBOL "COBOL-like" is stretching things quite a bit. > > OK, so I'll change it to "vaguely COBOL-like"... :-) > > Seriously, though, there some high-level similarities, and not just > the purpose...

Re: DIBOL manual

2019-10-13 Thread Chuck Guzis via cctalk
On 10/13/19 1:29 PM, Jason T via cctalk wrote: > On Sun, Oct 13, 2019 at 1:47 PM Chuck Guzis via cctalk > wrote: >> There's a DIBOL self-instruction book on bitsavers: >> >> http://bitsavers.org/pdf/dec/pdp8/dibol/DEC-08-WDRA-D_DIBOL_Programming_A_Self-Instruction_Manua

Re: DIBOL manual

2019-10-13 Thread Chuck Guzis via cctalk
On 10/13/19 10:35 AM, Noel Chiappa via cctalk wrote: > I recently picked up a copy of "CTS-300 - DIBOL Language Reference Manual" > (because when I went to do a CHWiki page for the language: > > http://gunkies.org/wiki/DIBOL > > I could find almost nothing about it online); does anyone have

Re: Nuke Redmond!

2019-10-07 Thread Chuck Guzis via cctalk
On 10/7/19 8:28 AM, allison via cctalk wrote: > Its been a while but same game and I'm not a player. > > I just don't run windows. I jumped that ship back in 06 when > burned on NT. Since then its Linux. If you play in the swamp > of M$ then your run all the risks and costs. Its just not good

Re: Looking for front panel switch

2019-10-05 Thread Chuck Guzis via cctalk
Looks like a C model with a J60 type actuator and a PCB mount. Something like this? https://www.tedss.com/MT-SPDT-7101 C has a bewildering selection of actuators and mounting options, so I'm just venturing a wild guess. --Chuck

Re: LISP implementations on small machines

2019-10-03 Thread Chuck Guzis via cctalk
On 10/3/19 9:01 AM, Noel Chiappa via cctalk wrote: > The PDP-6 and KA10 (basically a re-implementation of the PDP-6 architecture) > both had cheapo versions where addresses 0-15 were in main memory, but also > had an option for real registers, e.g. in the PDP-6: "The Type 162 Fast > Memory Module

Re: Detecting inserted floppy drive WAS: Raymond Check discusses MS DOS Floppy Disk Cache

2019-10-02 Thread Chuck Guzis via cctalk
On 10/2/19 3:15 PM, Fred Cisin via cctalk wrote: > Sorry, I was assuming the previous discussion! > > This implies that some newer drives actually had a "disk present" > signal, or wouldn't let you close the door without a disk, but had a > door signal. > > Rather than an "unnecessary" training

Re: Detecting inserted floppy drive WAS: Raymond Check discusses MS DOS Floppy Disk Cache

2019-10-02 Thread Chuck Guzis via cctalk
On 10/2/19 2:07 PM, Ali via cctalk wrote: > Just wondering if anyone (Chuck, Fred?) knows what is the exact technique > referred to in this other post by Raymond? > > devblogs.microsoft.com/oldnewthing/20090402-00/?p=18643 > Not enough information to know. It should be noted that one needn't

Re: Course materials for MIT 6.031 (c. 1974) scanned

2019-10-01 Thread Chuck Guzis via cctalk
On 10/1/19 5:22 PM, Paul Koning via cctalk wrote: >> Both better have backups. Paper tape doesn't do well in fires and floods. > > I remember Mylar punched tape. That stuff is amazingly strong and > waterproof. I've seen it for paper tapes that were intended to be read > thousands of times

Re: Tandem Minicomputers

2019-09-30 Thread Chuck Guzis via cctalk
On 9/30/19 10:44 AM, Wayne S wrote: > SII ( system integrators inc, not System Industries Inc) produced a big > system for Newspaper editing. Could be over 3000 seats. It used Coyote > terminals. IIRC, i think it ran the Guardian operating system. > At the time, I wondered if the name had been

Re: Tandem Minicomputers

2019-09-30 Thread Chuck Guzis via cctalk
On 9/30/19 8:57 AM, Jon Elson via cctalk wrote: > On 09/29/2019 11:46 PM, Jason T via cctalk wrote: >> Well I said no more computers I can't lift, but exotic systems keep >> finding me.  So today we pulled a Tandem CLX out of a basement, along >> with a few boxes of docs, 9-track tapes and random

Re: fix? Repair? or leave alone? http://rcade.camden.rutgers.edu/2020symposium.html

2019-09-27 Thread Chuck Guzis via cctalk
On 9/27/19 9:22 AM, Brent Hilpert via cctalk wrote: > On 2019-Sep-27, at 6:47 AM, Paul Koning via cctalk wrote: >> I make it a habit to assume that every email which contains just a >> link but no explanation is a scam with a forged sender address. >> >> Ed, if this is actually from you and

Re: Raymond Check discusses MS DOS Floppy Disk Cache

2019-09-24 Thread Chuck Guzis via cctalk
On 9/24/19 4:13 PM, Fred Cisin via cctalk wrote: > COULD somebody go from write protected 8" or non-write-protected 5.25" > (did you sense door open?) to disk out of drive in under 250ms, and then > lso go from door open, no disk to non-write protected disk in drive > (door still open?) in under

Re: Raymond Check discusses MS DOS Floppy Disk Cache

2019-09-24 Thread Chuck Guzis via cctalk
On 9/24/19 12:53 PM, ben via cctalk wrote: > Well I am guessing, the time the flopppy motor was kept on after > a block read/write. Ben. No, the spin-down delay is much longer than that--take a look at the 5150 BIOS. --Chuck

Re: Raymond Check discusses MS DOS Floppy Disk Cache

2019-09-24 Thread Chuck Guzis via cctalk
On 9/24/19 12:40 PM, Christian Liendo via cctalk wrote: > I meant to say Raymond Chen and it didn't notice the spell check change > > Sometimes modern technology sucks. > > On Tue, Sep 24, 2019 at 3:18 PM Christian Liendo wrote: >> >> How did MS-DOS decide that two seconds was the amount of

Re: flux to imd

2019-09-21 Thread Chuck Guzis via cctalk
On 9/21/19 10:26 AM, Al Kossow wrote: > > > On 9/21/19 10:12 AM, Mark J. Blair wrote: > >> Is it effective to bake cookies in their jackets? > I don't know, since i've never baked floppies. Chuck would know. Yes, I do. Usual 58C temps that I use for tapes. Doesn't seem to affect the jacket.

Re: Early Univac Commercial

2019-09-20 Thread Chuck Guzis via cctalk
On 9/20/19 8:16 AM, William Sudbrink via cctalk wrote: > Isn't there also one that's a "help wanted" for programming positions? > I seem to recall that they didn't say anything about professional training > or experience, just things like "do you have a logical, ordered way of > thinking?" I

Re: PBXes at home

2019-09-19 Thread Chuck Guzis via cctalk
On 9/19/19 7:27 PM, Ethan O'Toole via cctalk wrote: > > Where does one find a working 5ESS for home? How about a 5XB? :)

Re: Early Univac Commercial

2019-09-19 Thread Chuck Guzis via cctalk
There are several Univac commercials in the archive.org video library. I like the one that talks about he Univac "memory tank", which, it really was. The curious thing was that Remington Rand ran commercials not only for UNIVAC computers, but also for shavers and typewriters. --Chuck

Re: phone systems, old and less-old

2019-09-19 Thread Chuck Guzis via cctalk
On 9/19/19 6:37 PM, Kevin Monceaux via cctalk wrote: > On Thu, Sep 19, 2019 at 11:23:38AM -0700, Chuck Guzis via cctalk wrote: > >> What's in a name? > > Accuracy. > >> It looked gray to me. > > Me too. But enough videos that I watched featured individuals

Re: phone systems, old and less-old

2019-09-19 Thread Chuck Guzis via cctalk
On 9/19/19 9:56 AM, Kevin Monceaux via cctalk wrote: > On Wed, Sep 18, 2019 at 09:05:07PM -0700, Chuck Guzis via cctalk wrote: > >> 25 pairs, where >> >> White Red Black Yellow Violet for each "bank" and within each bank >> Blue Orange Green Brown Gray &

Re: phone systems, old and less-old

2019-09-19 Thread Chuck Guzis via cctalk
On 9/19/19 9:56 AM, Kevin Monceaux via cctalk wrote: > On Wed, Sep 18, 2019 at 09:05:07PM -0700, Chuck Guzis via cctalk wrote: > >> 25 pairs, where >> >> White Red Black Yellow Violet for each "bank" and within each bank >> Blue Orange Green Brown Gray &

Re: phone systems, old and less-old

2019-09-18 Thread Chuck Guzis via cctalk
One aspect of the RJ21 coding that's always puzzled me was the ordering of the colors. 25 pairs, where White Red Black Yellow Violet for each "bank" and within each bank Blue Orange Green Brown Gray So the first pair would be White-Blue and the last (25th) would be Violet-Gray Does anyone know

Re: phone systems, old and less-old

2019-09-18 Thread Chuck Guzis via cctalk
On 9/18/19 6:27 PM, Fred Cisin via cctalk wrote: > Please don't let anybody call the 25 pair 50-pin miniature ribbon > connector (RJ21),  "Centronics"! We used to call them "blue ribbon" connectors. I'm sure that that's also a misnomer. --Chuck

Re: phone systems, old and less-old

2019-09-18 Thread Chuck Guzis via cctalk
On 9/18/19 6:16 PM, Jon Elson via cctalk wrote:   > Oh, my Gosh!  the first 3 pics are of a KTU phone system.  If you are > OLD enough, remember the phones with 5 line select buttons and a red > hold button below the rotary dial?  That is what that unit supports, the > 565 phone. You have to be

Re: Ferroresonant transformer supply repair

2019-09-09 Thread Chuck Guzis via cctalk
I don't know your location, but the surplus electronics/electricals vendors here in the US tend to have lots of the the older oil caps (no PCBs). e.g. https://www.electronicsurplus.com/capacitors/oil-filled-capacitor/page/2

Re: Ferroresonant transformer supply repair

2019-09-08 Thread Chuck Guzis via cctalk
On 9/8/19 7:41 PM, Kyle Owen via cctalk wrote: > I can't seem to find motor caps that meet the voltage spec of 660V. 8uF > doesn't seem like a problem, but the combination together isn't looking > good. Are there any specific vendors I should be looking at? My usual > suspect of DigiKey isn't

Re: Toshiba "laptop"

2019-09-04 Thread Chuck Guzis via cctalk
On 9/4/19 8:50 AM, Diane Bruce via cctalk wrote: > Toshiba T6400DX That's the orange plasma-display one, right? I suspect there will be several interested collectors over at vcfed.org. --Chuck

Re: Searching cctalk/cctech

2019-09-02 Thread Chuck Guzis via cctalk
On 9/2/19 7:37 PM, Fred Cisin via cctalk wrote: > On Mon, 2 Sep 2019, Chuck Guzis via cctalk wrote: >> Anent that--Google does have a search language of sorts: >> https://ahrefs.com/blog/google-advanced-search-operators/ >> These elements can reduce the eyestrain from lookin

Re: Searching cctalk/cctech

2019-09-02 Thread Chuck Guzis via cctalk
On 9/2/19 11:09 AM, Alan Perry via cctalk wrote: > > > On 9/2/19 11:01 AM, Guy N. via cctalk wrote: >> On Mon, 2019-09-02 at 09:27 -0700, Alan Perry via cctalk wrote: >>> Is there a way to search all of cctalk and cctech? I found the archives, >>> but that is split all of the postings in a given

Re: So what the heck did I just pick up?

2019-08-31 Thread Chuck Guzis via cctalk
On 8/30/19 7:24 PM, John Ames via cctech wrote: > Ran into this at the electronics-surplus store just down the way from > my workplace and grabbed it on the cheap. I don't actually know what > it *is,* but the labels on the switches make it look a *hell* of a lot > like a 16-bit general-purpose

Re: Decaying foam on PCBs

2019-08-27 Thread Chuck Guzis via cctalk
On 8/27/19 8:18 PM, David Collins via cctalk wrote: > In Australia there’s this product ; > > https://awareenvironmental.com.au/product/sticky-spot-goo-dissolver/ > > It’s citrus based but I haven’t had any bad effects on PCBs. It does affect > some styrene plastics but in general it’s safe and

Re: multi-section cap for Tek 4006

2019-08-18 Thread Chuck Guzis via cctalk
There are the old radio guys who seem to hoard NOS caps. You may want to check these guys to see if they have something that might fit: https://www.vivatubes.com/ https://www.justradios.com/ Personally, rather than depend on the condition of a very old electrolytic, I'd probably rebuild "in the

Re: Raspberry Pi write cycles

2019-08-14 Thread Chuck Guzis via cctalk
On 8/14/19 8:04 PM, dwight via cctalk wrote: > Some of the newer larger SD cards use a different write voltage than 3.3V. > There is a ways of asking the card what voltage it likes during the init. > Using the full 3.3V on these parts can damage them. > They are all required to init with 3.3V but

Re: Pertec Interface Cable Length

2019-08-13 Thread Chuck Guzis via cctalk
On 8/12/19 8:16 AM, Nigel Johnson via cctalk wrote: > Another consideration with the TC02 is the small buffer. I don't know > what tape speed your drive runs at, but we lost a lot of sales to Dilog > because of buffer overflow on some of the faster CDC dirves.  When we > came out with the TC03, it

Re: Pertec Interface Cable Length

2019-08-13 Thread Chuck Guzis via cctalk
On 8/12/19 8:11 AM, Douglas Taylor via cctech wrote: > The bad news is that the cable lengths must be short to use the Qualstar > 1260 with a PDP11, the good news is that I can lift and carry the tape > drive!  For many of us in this hobby that it is extremely important. > > After looking at

Re: Control Data 9766 drive on epay

2019-08-12 Thread Chuck Guzis via cctalk
On 8/12/19 12:31 PM, William Donzelli via cctalk wrote: > It was an uncommon option for lower end Cyber 180s. > Don't know the date of the unit shown, but in the early-mid 1970s, we used acres of 844-21(IIRC ~100MB) and 844-41 drives (IIRC ~200MB). Don't know what the OEM model would have been.

Re: Pertec Interface Cable Length

2019-08-12 Thread Chuck Guzis via cctalk
On 8/11/19 8:51 PM, Douglas Taylor via cctech wrote: > > The TC02 is an Emulex TS11 emulation for pertec interface tape drives.  > The J1 and J2 are sort of standard terminology, don't know why. Ah, the *Emulex* TC02. You had me going there--DEC also has a DECtape controller called the TC02.

Re: Pertec Interface Cable Length

2019-08-12 Thread Chuck Guzis via cctalk
On 8/11/19 9:11 AM, W2HX via cctech wrote: >> All of my Pertec tape drives (in the past) were located in > a differentrack from the actual computer so the cables were > always over 10' long and usually close to if not 20'. Never > had a problem. I stand by my commentary re Qualstar 1xxx drives.

Re: Pertec Interface Cable Length

2019-08-12 Thread Chuck Guzis via cctalk
On 8/11/19 6:00 PM, Douglas Taylor via cctech wrote: > I just looked at the TC02 and the Qualstar, there are termination > resistor packs on each.  The Qualstar has a bunch of 74LS240 IC's near > the J1 and J2 pertec interface cables.  The TC02 has a bunch of 74LS374 > chips near the J1 and J2

Re: Pertec Interface Cable Length

2019-08-11 Thread Chuck Guzis via cctalk
On 8/10/19 9:45 AM, Douglas Taylor via cctech wrote: > I bought the long cables off ebay, so they have to be good? Right? I > think the short cables came from a hamfest. > > The cables can be fairly long, I remember interfacing a TU80 to an > Emulex QT14 (maybe) and the DEC cables were round and

Re: Pertec Interface Cable Length

2019-08-10 Thread Chuck Guzis via cctalk
On 8/9/19 9:05 PM, Douglas Taylor via cctech wrote: > I have a question about cable length - any electrical engineers in the > house? > > Connected a Qualstar 1260 tape drive to an Emulex TC02 qbus tape > controller in a pdp-11/53.  The interface is pertec with 2 50 pin cables. > > When I use a

Re: looking for a 7-track reel tape controller

2019-08-08 Thread Chuck Guzis via cctalk
On 8/8/19 12:25 AM, Christian Corti via cctalk wrote: > On Wed, 7 Aug 2019, Michael Thompson wrote: >> can be connected to both 7-track and 9-track drives. The TU20 drive on >> the >> PDP-9 at the RICM is a 7-track drive. The only difference between the >> 7-track and 9-track versions of the TU20

Re: Scotch 777 "blue label" tape blues confirmed

2019-08-06 Thread Chuck Guzis via cctalk
On 7/20/19 10:18 AM, Mark J. Blair via cctalk wrote: > >> On Jul 20, 2019, at 9:38 AM, Chuck Guzis via cctalk >> wrote: >> >> your cleaning machine > > I do not have a cleaning machine. Do you suppose a cyclomethicone > applicator fabricobbled into the ta

Re: Resurrecting integrated circuits by cooking them.

2019-07-28 Thread Chuck Guzis via cctalk
On 7/28/19 1:02 PM, Jerry Weiss via cctalk wrote: > This method is not limited to "vintage" components. > > My MacBook Pro 2011 fails dues to its (famous) problem with the discrete > AMD GPU connections.   A reflow restores the laptop, but inevitably I > have repeat the process every few months.

Re: UNIVAC IBM AND APOLLO - -History --Background

2019-07-21 Thread Chuck Guzis via cctalk
On 7/21/19 11:41 AM, ED SHARPE via cctalk wrote: > Great > info!https://www.zdnet.com/article/to-the-moon-ibm-and-univac-appollo-11s-integrators/?ftag=TREc64629f=46856739 Since I'm just winding up (I hope!) archiving a batch of tapes from JPL from the 60s and 70s, I might toss in a word or two.

Re: Scotch 777 "blue label" tape blues confirmed

2019-07-20 Thread Chuck Guzis via cctalk
On 7/20/19 10:18 AM, Mark J. Blair via cctalk wrote: > >> On Jul 20, 2019, at 9:38 AM, Chuck Guzis via cctalk >> wrote: >> >> your cleaning machine > > I do not have a cleaning machine. Do you suppose a cyclomethicone applicator > fabricobbled into the

Re: Scotch 777 "blue label" tape blues confirmed

2019-07-20 Thread Chuck Guzis via cctalk
On 7/20/19 9:24 AM, Dennis Boone via cctalk wrote: > > Coating the tape with a film of cyclomethicone allowed it to be > > successfully read. > > I'm curious what mechanism you use for the coating? A thick (1/4") felt strip glued to a large PVC pipe cap with a few small (#60) holes drilled in

Re: Scotch 777 "blue label" tape blues confirmed

2019-07-20 Thread Chuck Guzis via cctalk
On 7/19/19 8:59 PM, Adrian Stoness wrote: > same as sticky shed syndrome? No, not exactly--it's more like binder bleed-through. The oxide remains firmly attached to the base, but there is a film of either gummified lubricant or binder that fouls up things. Normally, if it's sticky-shed, the

Scotch 777 "blue label" tape blues confirmed

2019-07-19 Thread Chuck Guzis via cctalk
This is in reference to my earlier post about Scotch 777 half-inch open-reel tapes. I'd reported that I encountered a tape that displayed binder bleed, such that the tape would stick to the heads and guides. This was a tape that had been both baked and cleaned. Coating the tape with a film of

Re: Scanning question

2019-07-18 Thread Chuck Guzis via cctalk
On 7/18/19 10:01 PM, Guy Dunphy via cctalk wrote: > I have a lot more to say about the wisdom of destroying original publications > to scan them, especially when you are not already an expert at scanning and > the many tradeoffs. > But have to go afk just now. It would seem to be possible today.

Re: WordPerfect 5.1+ for VMS

2019-07-18 Thread Chuck Guzis via cctalk
On 7/18/19 11:38 AM, Mark J. Blair via cctalk wrote: > > >> On Jul 17, 2019, at 10:43 PM, Dave Wade via cctalk >> wrote: >> I think even if you have the key it fails today. There was a thread recently >> on comp.os.vms >> >> Saying it expires after days and theirs had just expired... >

Re: 16-bit ISA tape controllers

2019-07-12 Thread Chuck Guzis via cctalk
On 7/12/19 4:25 AM, Electronics Plus via cctalk wrote: > These do not come available very often. Not affiliated with seller, etc. > > > > WTS EVEREX SYSTEMS PCT04, REF, qty 5, CALL, TAPE CONTROLLER 16 BIT ISA > > > Sajjad Mukhi > Sales/purchasing > FML Computers Inc > Phone: 407-637-2922

Re: 5 1/4 diskettes available

2019-07-10 Thread Chuck Guzis via cctalk
On 7/10/19 7:14 PM, Fred Cisin via cctalk wrote: >>> They have hub rings, so they are probably 360K To add a bit to Fred's excellent explanation, I can offer the following: While the hub ring is *generally* a good indicator of "2D" versus "HD" disks, I've seen exceptions. Early 2D floppies did

Re: Lots of Apple 1 computers @ VCF West

2019-07-08 Thread Chuck Guzis via cctalk
On 7/8/19 8:25 AM, Liam Proven via cctalk wrote: > > Spoken like a non-collector. :-) I suppose that's the root of it. I'm basically a pragmatist. I give away old hardware that no longer has any use to me. When I am eventually forced to downsize, (or my widow is) most of the stuff will go

Re: Lots of Apple 1 computers @ VCF West

2019-07-08 Thread Chuck Guzis via cctalk
On 7/8/19 7:43 AM, Ethan O'Toole via cctalk wrote: >> Actually the cheapest Apple-1 reproduction is just over 4 figures.  A >> reproduction with date correct components cost as much as 5 figures. >> A work-alike like a replica-1 is cheap, maybe $150 > > No idea why people would go 5 figures on a

Re: Email delivery protocols / methods.

2019-07-06 Thread Chuck Guzis via cctalk
Those who quibble about the ftp being a separate entity from mail protocol would do well to look at RFC 524 from 1973. There, the MAIL command is implemented within the ftp structure (that is, it is an ftp command). I've found it interesting that 524 never addresses the matter of data

Re: NASA Ames (Moffet Field) Computation Division?

2019-07-02 Thread Chuck Guzis via cctalk
On 7/2/19 4:55 AM, Nigel Williams wrote: > On 2 Jul 2019, at 1:34 pm, Chuck Guzis via cctalk > wrote: >> Anyone know what hardware was at NASA Ames in the late 70s? I've >> got some tapes from there and would like to avoid guessing. > Well excitingly it was home to the Il

NASA Ames (Moffet Field) Computation Division?

2019-07-01 Thread Chuck Guzis via cctalk
Anyone know what hardware was at NASA Ames in the late 70s? I've got some tapes from there and would like to avoid guessing. --Chuck

Re: "half-dollar"/"50 cent piece" Was: Recovering the ROM of an IBM 5100 using OCR

2019-06-29 Thread Chuck Guzis via cctalk
On 6/29/19 3:39 AM, Liam Proven via cctalk wrote: > You use nicknames for 2 denominations which most of us foreigners > don't know -- I still don't know which is a "nickel" (which is a metal > to me) and which is a "dime" (which is a Swedish chocolate-covered > sweet bar, of which I'm very fond

Re: OT: "half-dollar"/"50 cent piece" Was: Recovering the ROM of an IBM 5100 using OCR

2019-06-28 Thread Chuck Guzis via cctalk
On 6/28/19 12:18 PM, Chuck Guzis via cctalk wrote: > > FWIW, I just checked my "loose change" container that sits atop my > bedroom dresser. There were two Kennedy half-dollars--one from 1968 and > the other from 1983. I suspect that a great many are still in > circula

Re: OT: "half-dollar"/"50 cent piece" Was: Recovering the ROM of an IBM 5100 using OCR

2019-06-28 Thread Chuck Guzis via cctalk
On 6/28/19 9:57 AM, Fred Cisin via cctalk wrote: >>> I saw this half-dollar sized plastic fob on the desk and asked what >>> it was for. The big failure of the Susan B. Anthony coin was that it was about the same size (slightly different shape) as a quarter-dollar coin, causing people to mistake

Re: Recovering the ROM of an IBM 5100 using OCR (among other things)

2019-06-27 Thread Chuck Guzis via cctalk
On 6/27/19 10:03 AM, John Foust via cctalk wrote: > At 11:32 AM 6/27/2019, Jon Elson via cctalk wrote: >> If you google "magnetic tape viewer" they have pictures of what I think the >> earlier poster described. > > I see quite a few on eBay and Amazon. Looks like you just need to > pick a

Re: Recovering the ROM of an IBM 5100 using OCR (among other things)

2019-06-27 Thread Chuck Guzis via cctalk
I still use KyRead (older 70s era versions were Magnasee and Visomag), which are applied directly to the magnetic medium. Basically a mixture of micron-sized pyrolytic iron powder and an inert, rapidly-evaporating carrier. Shake the bottle up and drop some on the medium. As the carrier

Re: Recovering the ROM of an IBM 5100 using OCR (among other things)

2019-06-27 Thread Chuck Guzis via cctalk
On 6/27/19 7:30 AM, Noel Chiappa via cctalk wrote: > > From: Liam Proven > > > This is *epic*. > > Indeed. I was blown away by the complexity of his technique for reading > the digits. > > I can't believe there wasn't a much easier technique, though, e.g. using a > logic analyzer and a

Re: One of the deeper dives into RISC vs CISC I've seen

2019-06-16 Thread Chuck Guzis via cctalk
On 6/16/19 8:17 AM, Noel Chiappa via cctalk wrote: > Still, the basic idea of RISC still applies; make the CPU clock rate as fast > as > possible by making the instructions simple, and let software deal with the > resulting > issues. I'll mention in passing here that the goal of executing the

Re: One of the deeper dives into RISC vs CISC I've seen

2019-06-15 Thread Chuck Guzis via cctalk
On 6/15/19 3:40 PM, ben via cctalk wrote: > On 6/15/2019 8:47 AM, Stefan Skoglund via cctalk wrote: > >> With VAX 11/780 and S/360 involved ? I don't think so soo >> the Cyber series and 709(4) could be interesting. > > Well the early 1960's was the rise of BIG IRON that had REAL POWER > and

Re: One of the deeper dives into RISC vs CISC I've seen

2019-06-15 Thread Chuck Guzis via cctalk
On 6/15/19 7:47 AM, Stefan Skoglund wrote: > > With VAX 11/780 and S/360 involved ? I don't think so soo > the Cyber series and 709(4) could be interesting. It's difficult to say exactly, because of the constraints on the definition. Or does something have to be RISC only if it came after the

Scotch 770 tape types

2019-06-13 Thread Chuck Guzis via cctalk
I'm handling some tapes from the late 60s-early 70s and came across a curious situation. There are many Scotch 701 and 777 tapes in the lot with "yellow" labels, but on the single 777 "blue label" tape, I've encountered binder bleed something fierce. Running a reel through the tape cleaner at

Re: One of the deeper dives into RISC vs CISC I've seen

2019-06-12 Thread Chuck Guzis via cctalk
On 6/12/19 1:47 PM, alan--- via cctalk wrote: > > I especially appreciated he not only offered an opinion - his specific > ideas on where the boarder between RISC and CISC was - but then provided > an analysis of a bunch of processors based on those criteria and an > analysis of the outliers that

Re: One of the deeper dives into RISC vs CISC I've seen

2019-06-12 Thread Chuck Guzis via cctalk
On 6/12/19 10:14 AM, Paul Koning via cctalk wrote: > > >> On Jun 12, 2019, at 11:59 AM, Liam Proven via cctalk >> wrote: >> >> Goes a bit over my head but may be of interest: >> >> https://userpages.umbc.edu/~vijay/mashey.on.risc.html > > Nice. Still reading through it. > > I like his

Re: HP9816 PAL16L8

2019-06-11 Thread Chuck Guzis via cctalk
On 6/11/19 11:40 AM, Paul Berger via cctalk wrote: > > Well in this case I have Mr Duell's schematic to go by to determine what > is input an what is output.  For the 16L8 tristate is an available > output option that you would need to specify in PLD design and I believe > can be selected

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