On 03/16/2017 06:28 PM, ben via cctalk wrote:
> But was FORTRAN that portable? Other than the IBM 1130 I cannot think
> of a small computer that had ample I/O and memory to run and compile
> FORTRAN. All the other 16 bitters seem to more paper tape I/O. I
> suspect 90% of all university computers
On 03/16/2017 08:19 PM, Fred Cisin via cctalk wrote:
> In response to a question of who provided the Lisa FORTRAN, guy who
> insisted that Valtrep was the predecessor of FORTRAN 'course he also
> had OS/2 for the PDP-11, and a PROGRAM that could duplicate alignment
> disks, . . .
Oh jeez, not tha
On 03/17/2017 06:46 AM, Torfinn Ingolfsen via cctalk wrote:
> On Fri, Mar 17, 2017 at 4:31 AM, Chuck Guzis via cctalk
> wrote:
>> On 03/16/2017 08:19 PM, Fred Cisin via cctalk wrote:
>>
>>
>> Isn't "Valdtrep" a Norwegian march by Johannes Hansse
On 03/17/2017 10:06 AM, Chuck Guzis via cctalk wrote:
> Oh, I know--I was making a joke. It's a fine march and I've
> performed it in convert bands many times.
Er, make that "concert bands"
--Chuck
On 03/17/2017 11:09 AM, Fred Cisin via cctalk wrote:
> and, although we don't know when YOU were playing it, the march had
> been around half a century, so was probably playing on the radio to
> inspire Backus. Does that mean that Dan. might be right about it
> being the predecessor to FORTRAN?
On 03/17/2017 11:41 AM, Paul Koning wrote:
> Not quite true. ALGOL was the first choice for a couple of
> architectures: Electrologica X8, and the Burroughs 48-bit mainframes.
> And I supposed you could claim that status for Bliss in the case of
> VAXen, though in a different sense there was a wh
On 03/17/2017 11:41 AM, Paul Koning wrote:
> Not quite true. ALGOL was the first choice for a couple of
> architectures: Electrologica X8, and the Burroughs 48-bit mainframes.
> And I supposed you could claim that status for Bliss in the case of
> VAXen, though in a different sense there was a wh
On 03/19/2017 08:04 AM, Bill Gunshannon via cctalk wrote:
> FORTRAN. FORTRAN D (DOS/360), F and G (OS/360), which were FORTRAN
> IV compilers (retronamed "Fortran 66"). VAX/VMS Fortran 77, except
> most VAXen of the day you seem to be talking about ran BSD Unix and
> Fortran was handled by f2c.
On 03/19/2017 11:20 AM, Warner Losh via cctalk wrote:
> Just about ANY CF card you buy today new will have wear leveling.
> It's almost impossible without trying to be an ass to the card to
> have it fail in a few weeks. I've run 64MB cards in Soekris boxes for
> a decade w/o any problems. The key
On 03/19/2017 02:14 PM, Toby Thain via cctalk wrote:
> "The Fortran codes implementing the most effective methods are
> provided in the included diskette. The codes are portable on virtually
> any computer, extensively commented and---hopefully---easy to use."
Take a look at early ACM CALGO (co
On 03/21/2017 02:44 PM, Seth Morabito via cctalk wrote:
> I would very much like to get one of my 3B2s up and running on this
> new UUCP network. I still have a mostly fallow land line that I can
> use. When I have some time in the next week or two, I'll try to get
> things ready under SVR3 UNIX.
On 03/22/2017 03:49 PM, Terry Stewart via cctalk wrote:
> Anyway, has anyone else faced this kind of challenge and what are
> your thoughts? I don’t want to start unless I at least have some
> chance of success. I’m not hopeful. The more I read the more you
> seem to need real forensic skills a
On 03/22/2017 04:42 PM, Fred Cisin via cctalk wrote:
> Once you've got sectors, speak up, and we'll give you more things to
> look at.
Fred, how about the image of a Compugraphic typesetter floppy I have?
It uses Hebrew for its code set.
Feel up to it?
--Chuck
On 03/22/2017 08:39 PM, Terry Stewart via cctalk wrote:
> Chuck, in the highly likely event of the formats NOT being common
> CP/M or DOS ones (i.e. ones I could probably manage), I'll give these
> guys your email (-:
Tez,
Here's what I would do in your situation.
If the disks are hard-sectored
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
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 com
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
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
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
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 look
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
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 OL
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
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
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
>
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
>
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 individ
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
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? :)
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 don't
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.
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 time
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
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 a
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 actual
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 o
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
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 --
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 sp
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 i
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
Looks like a C&K model with a J60 type actuator and a PCB mount.
Something like this?
https://www.tedss.com/MT-SPDT-7101
C&K has a bewildering selection of actuators and mounting options, so
I'm just venturing a wild guess.
--Chuck
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
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 eno
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_
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...
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 foil
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 adhesi
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
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
structure
Was it in use at Berkeley? I might have it stashed away in some of my
BSD-related tapes.
--Chuck
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 i
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 mushroo
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 d
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
memor
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 se
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
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 w
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
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
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 communi
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 addition
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
w
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:
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
G
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
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
>
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 remember
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 j
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 whe
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.
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
> http://bitsavers.org/pdf/qunatum/Q2000/81-49218A_Q2080_Technical_Reference_M
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)
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
On 11/18/19 12:37 PM, Dave Wade via cctalk wrote:
> One thing which complicates things is that we have (roughly) layered
> protocols in place between the 3174 and the host.
> So at the physical level we have channel attached, SDLC, Token Ring and
> bi-sync.
> Above that we have the channel prot
On 11/18/19 1:36 PM, Grant Taylor via cctalk wrote:
> On 11/18/19 2:22 PM, Chuck Guzis via cctalk wrote:
>> You can say that again. We never could get HASP running on out 11-750
>> on BSD. This was about 1984. The Berkeley Systems Group even tried
>> and no soap. T
On 11/18/19 5:36 PM, Will Cooke via cctalk wrote:
> I find it interesting that one of the few remaining mainframe third parties
> is called Micro Focus
Is that the same Micro Focus with the x86 COBOL?
--Chuck
On 11/19/19 1:36 AM, Dave Wade via cctalk wrote:
> I don't think its really "the same" anymore since it took on much of HPEs
> software. But essentially the great grandchild of the business which I
> believe started Don Higgins 370 emulator.
>
> https://www.mail-archive.com/ibm-main@listserv.u
On 11/19/19 11:05 AM, Adam Thornton via cctalk wrote:
> I might have had something to do with
>
> https://www.sinenomine.net/products/vm/njeip
>
> And as far as I remember, at least some of it was BSD licensed, so if
> that's what floats your boat...knock yerself out.
So where were you guys 35 y
On 11/25/19 11:15 AM, alan--- via cctalk wrote:
>
> Taking the risk of opening another can of worms...
>
> ARPANET wasn't the first large scale data network. I believe SITA HLN
> was world-wide by 1969. However it was a mix of switching technologies
> from fully automated to manual depending on
On 11/25/19 11:38 AM, William Donzelli wrote:
>> Does nobody remember AUTODIN?
>
> Basically, no.
Yeah. That's what I thought--or even WWMCCS.
--Chuck
On 11/25/19 8:33 PM, Fred Cisin via cctalk wrote:
> I don't know what I'll do now. I can't do the amount of stuff that I
> did decades ago.
What I've found with age is that nobody begrudges you for taking long
naps...
Zz,
--Chuck
I figure the record will finally be set straight after all of the people
involved at time cited are dead.
Such is history.
--Chuck
On 11/26/19 12:48 PM, Bill Gunshannon via cctalk wrote:
> On 11/26/19 1:32 PM, Chuck Guzis via cctalk wrote:
>> I figure the record will finally be set straight after all of the people
>> involved at time cited are dead.
>>
>> Such is history.
>>
>
>
On 11/26/19 6:43 PM, ben via cctalk wrote:
> But the stange thing now, all the 8 bitters are making a come back
> like the z80 with CP/M (USA) and the 6502 with BBC Micro (UK).
> What ever happened to all the wierd early transitor computers that were
> like 48+ bits and 4K of core memory hit the s
On 11/26/19 6:49 PM, Richard Pope via cctalk wrote:
> Fred,
> You are correct in your assessment. Which was first? The Altair and
> IMSAI had been available for years but you almost had to be an engineer
> to build them and use them. So were they first?
So how do you class the 1973 MCM/70? N
On 11/26/19 6:52 PM, Alan Perry via cctalk wrote:
>
> I am going through stuff in my office and found that I have some SCSI
> device docs that aren't on bitsavers. As far as multi-page documents, it
> seems as if my scanner (or its software) only does uncompressed TIFF. At
> bitsaver's recommended
On 11/26/19 7:17 PM, Richard Pope wrote:
> Chuck,
> I don't know anything about this system. I don't consider Minis and
> MainFrames to be Personal Computers. It must fit in a small room, run on
> a 120VAC 5Amp service, and not require 3 tons of AC to keep it cool to
> fit in to the Personal Co
On 11/27/19 3:52 AM, Liam Proven via cctalk wrote:
> On Wed, 27 Nov 2019 at 04:02, Chuck Guzis via cctalk
> wrote:
>>
>> Other than in very low-level MCUs, I don't see 8 bit micros making a
>> comeback. And 32/64 bits seems to be the rule for MCUs today.
>
> Y
On 11/27/19 8:47 AM, Jon Elson wrote:
> CDC may have had many more custom/one-of-a-kind machines, while IBM had
> tons of identical units in the field.
The "scorched earth" policy came right from the top- After it was
discovered that some "customer' had assembled a working system from
scavenged p
On 11/27/19 7:13 AM, Liam Proven via cctalk wrote:
Okay, you're right and I'm wrong. Everyone should play games on their
8 bit computers because they'll grow up to be real computer scientists.
--Chuck
On 11/27/19 8:46 PM, David Kuder via cctalk wrote:
> Hi friends,
>
> In the continuing saga of building a CP/M system with Pro-Log cards housed
> in a Heathkit dual 8” floppy drive cabinet…
If you're talking about ST2, bit 0 being set as an error, this can occur
for several reasons.
A. You're tr
On 11/28/19 7:06 AM, David Kuder via cctalk wrote:
> I've tried using the 8" drives as 8" drives with the clock input to the
> 8272 set correctly, and likewise with the 720KB 3.5" emulator (and even
> 360KB 5.25" emulation). On physical and virtual disks I'm getting the same
> error trying to read
On 11/28/19 9:34 PM, David Kuder via cctalk wrote:
> After digging in the manual for the controller card, it appears they have set
> it up to only support single density FM formatting. Even still, formatting
> the disk 568KB FM with either clock speed 8MHz or 4MHz (and 500KHz / 250KHz
> WCLK re
On 12/1/19 2:40 PM, Fred Cisin via cctalk wrote:
>
> TG43 is absolutely NOT needed for reading.
TG43 is also referred to as "RWC" reduced write current. Mostly
useful for FM recording; MFM uses precompensation, which subtly shifts
the timing of write pulses.
--Chuck
On 12/13/19 2:17 PM, Dave Mabry via cctalk wrote:
> There are three that appear to be Intel MDS diskettes. The ones marked
> ISIS V4.3 is, as I remember, the last version of ISIS-II that Intel
> released. ASM51 and RL51 appear to be assembler and relocater for the
> 8051 series of microcontrolle
On 12/13/19 2:54 PM, Fred Cisin via cctalk wrote:
> On Fri, 13 Dec 2019, Chuck Guzis via cctalk wrote:
>> MDS was my guess also. The MDS boxes ran the standard CP/M distro from
>> DRI--no customization needed. (The same was true for MP/M--a second
>> console was provided
On 12/13/19 4:41 PM, Fred Cisin via cctalk wrote:
> But the variant types don't invalidate your hypothesis of what system,
> any more than finding a few extraneous Macintosh diskettes in the box
> for your Windows disks. I assume that you are right, but there are some
> others thrown in.
> ("How
On 12/13/19 5:11 PM, Bill Gunshannon via cctalk wrote:
> I never saw any flippies commercially made but many
> companies made punches for flippy 5.25" disks. I always
> had to make my own for 8".
>
They were standard products. Let's see if I can find a period ad...
Well, not an ad, but a prec
Believe it or not, the "flippy" was actually patented in 1974.
US3932895A
...and let's not forget the 3" CF2 diskettes--designed to be flippies
right fron the get-go.
BASF certainly marketed 5.25" flippies:
https://cdn.instructables.com/FWP/3D0Z/GXL5XZ3U/FWP3D0ZGXL5XZ3U.LARGE.jpg
--Chuck
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