I could do it, but I'm a little squeezed for time and energy right now.
Spending my mornings under the LINAC.
--Chuck
On 3/2/22 13:35, W2HX via cctalk wrote:
>> then grease them with light, white lithium grease.
> Fully agree!
If you wanted something a bit cleaner and less prone to separation, I'd
suggest Boeshield T9.
Great stuff, but more expensive than lithium soap in oil.
--Chuck
Hitchhiking on Mike's thread, There's a question that I've wondered
about regarding rack slides.
Right now, for a couple of tape drives, I'm using slides rated at 150
lbs., yet they seem pretty flimsy when compared the the old heavy-duty
slides we used to use.
Has anyone tried using the standard
>> On 2022-02-24 9:29 a.m., Clemar Folly via cctalk wrote:
>>> Hi
>>>
>>> I'm looking for information about Texas Instruments TB-759933 IC.
>>>
>>> Does anyone have the datasheet or any other information about this IC?
>>>
>>> Thanks.
>>
>> What is the native habitat of this chip? Mother board, I
On 2/23/22 18:17, Doug Jackson via cctalk wrote:
> Hmm - Depends on where that pesky ground connection is put :-) (Duck)
Well, if you stand on your head whilst soldering it in, it's all good! :)
On 2/23/22 17:25, Chris Zach via cctalk wrote:
> Pretty much. I took apart my VT52 about 2 years ago because it wasn't
> happy. Turned out the +5 and +15 volt supplies were good but the -15 was
> bad.
>
> After fiddling around with capacitors and transistors I took the easy
> way out and just put
On 2/23/22 09:43, Paul Koning via cctalk wrote:
> I don't know PUTR, but my experience with DOS int13 code in RSTSFLX (built
> with DJGPP) is that it worked fine in a DOS window on Win95. And that makes
> sense, because Win95 is basically just a bit of UI veneer over DOS. Win NT
> is an entir
On 2/22/22 19:43, Jay Jaeger via cctalk wrote:
> Writing a 360KB or RX50 diskette with a 1.2MB drive is a path to a lot
> of frustration. Not only do you have to double step the drive (software
> often takes care of that part), but the tracks written will be narrower
> than a real RX50 / 306KB dr
On 2/22/22 16:12, js--- via cctalk wrote:
> As Chuck noted, I'd think you'd want to use 360K media -- not DSHD
> diskettes... and ensure that the 1.2MB drive is slowing down to 300RPM
> with a data rate of 250KHZ.
>
> These features will depend on the 1.2MB drive you have, as well as your
> FDC a
On 2/22/22 15:33, js--- via cctalk wrote:
>
> Rod,
>
> Not sure an RX33 (if 1.2MB equivalent) would write working RX50 800k
> (double density) disks. Very different drives.
I've copied RX50 disks for a customer. 96 tpi 80 cylinder single-sided,
10 x 512 byte sectors. You should be able to
On 2/20/22 10:10, Mark Kahrs via cctalk wrote:
> I heard Butler Lampson once exclaim that ECL design was in some ways easier
> than TTL. If you terminated every line, you get controlled impedances with
> controlled edges. This was the design philosophy for the Dorado.
Indeed--ECL WW prototype bo
On 2/10/22 22:39, Brent Hilpert wrote:
> On 2022-Feb-10, at 9:50 PM, Chuck Guzis via cctalk wrote:
>
>> I've got a piece of gear here with a bad MC858P used as a bus
>> driver--terminated in 220/330 ohms at the far end.
>>
>> Given that old DTL is a hit-or
I've got a piece of gear here with a bad MC858P used as a bus
driver--terminated in 220/330 ohms at the far end.
Given that old DTL is a hit-or-miss proposition, I'm proposing to
substitute a 7438 OC buffer. Pinout's the same, as is Vcc.
Before I get out the soldering iron, any "don't do it" tho
On 2/10/22 09:11, dwight via cctalk wrote:
> I hope you are not thinking it would test an Intel 4004 or a 8008? That would
> be a stretch. For the 4004, there is only a narrow range of frequencies it
> runs under. I'm not that familiar with the 8008 but suspect it has similar
> restrictions. Bot
On 2/9/22 12:44, Gavin Scott via cctalk wrote:
> On Wed, Feb 9, 2022 at 10:11 AM Mike Katz via cctalk
> wrote:
>> I'm still not sure how to clean the front of the head where the tape
>> touches the head. Any ideas?
>
> Back in the day there was "Tape Head Cleaner" Which was a little tin
> of tri
On 2/5/22 17:13, Jerry Wright via cctalk wrote:
> I'm going through a few of my ESDI and MFM hard drives and ran across 2
> Maxtor XT 2190 drives with all of the Drive Id's (1-4) tie together with 1
> long
> jumper and the drives have the write protect jumper is installed. Not sure
> what
On 2/1/22 13:40, Paul Koning via cctalk wrote:
>
> With MSCP, DEC switched to addressing disks by sector offset, as SCSI did
> later, rather than by geometry (cylinder, track, sector) on devices like the
> RK05 and RP06. If the OS sees only an LBA, it doesn't matter whether the
> drive uses z
On 2/1/22 09:16, Mike Katz via cctalk wrote:
> In the rotating drive world there is constant linear velocity (CLV) and
> constant angular velocity (CAV) drives.
>
> On CLV drives the speed of rotation would vary based on the track
> (slower in the inner tracks and faster on the outer tracks). Thi
There's also hardware partitioning. Back in the bad old days of the
5160 PC, some DTC controllers allowed for partitioning a drive (using
witch settings) into two smaller drives. I don't recall the exact BIOS
revision (BXD05?) where this came into play, but I have the manual.
--Chuck
Note also, that tapes can be partitioned per ANSI T10.
---Chuck
The IBM 1620 Monitor IID, partitioned the 1311 into various areas. I
can probably find other old examples.
--Chuck
On 1/25/22 14:06, Gary Oliver via cctalk wrote:
> My search results were dominated (even with 'advanced search') by Amazon
> and Ebay (naturally) but also by a couple of vendors (Cricut as example)
> and I never found anything coming up for .10 inch or equivalent in mm.
> This appears to be .10 i
On 1/25/22 06:18, Paul Koning via cctalk wrote:
>
>
>> On Jan 24, 2022, at 10:27 PM, Gary Oliver via cctech
>> wrote:
>>
>>> ...
>>
>> As to the real reason I was doing this: Most of my tapes are un-boxed and
>> have suffered being in a dusty area (before I got them) with the dust
>> forming
So, can we assume that the words about a "tape sandwich" refer to a
mylar base, oxide coating, and a lubricant/protective coating?
That is not an oxide coating sandwiched between to layers of mylar.
There was such a tape construction, used on the Datamatic 1000. (ca. 1955)
--Chuck
On 1/24/22 11:50, Paul Koning wrote:
>
> I thought Black Watch has coating on the back, as others mentioned. DECtape
> is not black but brown, so graphite doesn't seem to be involved.
I grabbed a reel of BW out of my stash and you're correct--the black is
on the back.
Still, I can see where a
On 1/24/22 11:05, Paul Koning via cctalk wrote:
> Looking at that spec some items pop out.
>
> The coating is quite thin, much thinner than the backing. Not too surprising
> actually, if it were thick it would reduce the max possible bit density.
>
> There is a coating wear spec (as a ratio of
On 1/23/22 10:16, Paul Koning via cctalk wrote:
> Maybe. But OCR programs have had learning features for decades. I've spent
> quite a lot of time in FineReader learning mode. Material produced on a
> moderate-quality typewriter, like the CDC 6600 wire lists on Bitsavers, can
> be handled t
On 1/18/22 22:32, Alan Perry via cctalk wrote:
>
> On 1/18/22 8:22 AM, Chuck Guzis via cctalk wrote:
>> You should be warned that Plastibands
>> do deteriorate after a year or so--I have a package of them that cannot
>> be stretched without breaking.
>>
>
>
On 1/18/22 11:38, Zane Healy via cctalk wrote:
>
>
>> On Jan 18, 2022, at 10:09 AM, Jonathan Chapman via cctalk
>> wrote:
>>
>>> My opinion is that if you're trying to use DC carts for archival
>> storage, you should have your (tape) head examined.
>>
>> Not archival storage, just day-to-day op
On 1/18/22 07:33, Jonathan Chapman via cctalk wrote:
> https://i.imgur.com/48EfOQG.jpg
>
> That's after sitting parked a couple months. I have a Dysan doing it too. The
> Dysan had been re-banded with a boiled 3M band and run for years like that
> with no shedding. I have another Dysan with a gr
On 1/12/22 20:16, Grant Taylor via cctalk wrote:
> That's a mailing list, not a newsgroup.
>
> But it is likely to be more active than the free.typewriters newsgroup.
Picky, picky picky...
The old Golf Ball Typewriter Shop list is long gone, and this was
suggested as an alternative.
--Chuck
On 1/12/22 19:25, Grant Taylor via cctalk wrote:
> On 1/12/22 5:49 PM, Van Snyder via cctalk wrote:
>> I have an old IBM Model C typewriter. I can't bear to throw it away,
>> even though it doesn't work well. The carriage doesn't advance, and the
>> A key doesn't work. Do you know how to tune it up
On 1/12/22 12:23, Noel Chiappa via cctalk wrote:
> Given how arcane the RX02 format is (sector _headers_ are written in single
> density; sector _data_ is written in double) I'd be pretty surprised if
> anything except an RX02 can do it.
True that--however, a flux transition-type controller, such
On 1/6/22 10:17, William Donzelli wrote:
> If you include prototypes, then you need to include ALL the prototypes
> - even things made in single quantities that never worked.
>
> That is a HUGE amount of stuff that makes EBAM look gigantic.
To be fair, EBAM received a not-insignificant amount of
Perhaps even rarer were the EBAM tubes that CDC worked with during the
1970s. I recall seeing a 6' rack of a complete assembly sitting in a
hallway at ADL around 1974. If CDC followed the dictates of management
then, the unit was probably utterly demolsihed before being sold as
scrap metal.
--
On 1/4/22 4:04 PM, Grant Taylor via cctalk wrote:
> I knew about 50 and 60 Hz and DC growing up. I learned about 400 (?) Hz
> being used in military applications about a decade ago. 25 Hz was a
> surprise to me over the last year or so. I read some interesting
> things, much of it related to Ni
On 1/4/22 3:14 PM, Jonathan Chapman wrote:
>> High-leg delta is independent of open- or closed-delta.
>
> That's correct.
>
>> Open delta uses two single-phase transformers primaries connected to
>> phases AB and BC.
>
> A to C is also valid, presumably it's rotated if there's a lot of open delt
On 1/4/22 12:15 PM, Jonathan Chapman via cctalk wrote:
> One of the top Google results:
>
> https://www.engineeringradio.us/blog/2012/02/the-open-delta-three-phase-service/
>
> Really really, there's only two pigs on the pole. And yet, delta power,
> though at a lower rating than transformer nam
On 1/4/22 10:04 AM, Paul Koning via cctalk wrote:
> The other option, typically somewhat more expensive but cheaper than an
> 11/780, is a rotary converter. Those are 3 phase motors, sometimes modified
> a bit, driven from single phase power that construct the missing phase
> somewhat like a d
On 1/4/22 7:40 AM, Grant Taylor via cctalk wrote:
> I guess I thought that since Seymour left CDC to form Cray Research,
> that meant that he was more of an employee at CDC and had less influence
> on how it operated as a company. I would have assumed that someone that
> was a founder would have
On 1/3/22 6:49 PM, Grant Taylor via cctalk wrote:
> On 1/3/22 4:01 PM, Chuck Guzis via cctalk wrote:
>> https://twitter.com/DonaldM38768041/status/1215804561333473280/photo/2
>
> Interesting series of tweets.
>
> I'm surprised by the tweet about Seymour Cray founding
On 1/3/22 1:23 PM, Paul Koning wrote:
> The 6603 is highly unusual because it has 12 bit parallel data flow, rather
> than bit-serial as everyone else did (until Cray went back to parallel with
> the Cray 1, if I remember right). That made the 6603 very much faster, as
> far as data throughput
On 1/3/22 10:58 AM, Paul Koning via cctalk wrote:
> The discussion about 3-phase made me check some documentation.
> I also looked at some CDC 6000 series docs. Those used 400 Hz 3 phase for
> supplying the CPU and peripheral logic. The CPU cabinets also take 3 phase
> mains power for the com
On 1/2/22 11:16 AM, Jonathan Chapman via cctalk wrote:
>> I'd really like 3ɸ at home for a number of different things.
>
> In North America? Good luck! Part of what got me to buy a smallish industrial
> building was needing three phase. It's usually cheaper/easier to either use a
> VFD if it's f
On 12/26/21 9:30 PM, Doug Jackson via cctalk wrote:
> "worked the last time used but no guarantees and are sold as is"
>
> Reminds me of the test and tag rip-off that has been embedded in
> legislation.
>
> It was OK when we tested it at 3pm on Tuesday afternoon Your Honor.
>
> Gone are the days
Hey list,
I received a note today from a fellow in London who has 2 9-track tapes
that he'd like read. Brands are CDC and BASF, so media shedding should
not be a problem. Dates are '92 and '93, so likely 1600 or 6259. The
tape seal on one (the other has no seal) is IBM-style, which may be the
On 11/25/21 12:11 PM, Fred Cisin via cctalk wrote:
> When he founded DDJ ("dr. dobb's journal Of Tiny BASIC Calisthenics And
> Orthodontia : Running Light Without Overbyte"), they considered it to be
> a reference, not a newspaper, and kept reprints of the old issues
> available in bound form.
>
S
On 11/25/21 9:16 AM, Christian Liendo via cctalk wrote:
> https://web.stanford.edu/~allison/JimWarren.html
>
> For those who do not know about Jim Warren
>
> Jim Warren's wiki page
> https://en.m.wikipedia.org/wiki/Jim_Warren_(computer_specialist)
As a longtime subscriber to DDJ and attendee at
On 11/24/21 6:42 AM, John Herron via cctalk wrote:
> I can speak for state government but not fed (this was 20 years ago). It
> was an annoying buzz kill that we had to destroy old equipment, and deface
> documentation and software so it would be unusable from dumpster divers.
> Some pallets of har
On 11/23/21 9:51 AM, Bill Gunshannon via cctalk wrote:
doubt that a single line of that survives.
>
> You would probably be wrong, it likely was archived before
> it stopped being used. But that won't do you any good as
> even if you could submit a FOIA request for it the cost of
> recovering it
On 11/22/21 2:59 PM, Guy Sotomayor via cctalk wrote:
> In my case it's stuff that *I* didn't save and just tossed it because
> "Why would I ever want this anymore?". I *really* regret tossing all of
> the source for stuff I wrote while I was at IBM. It was after all IBM's
> property (since I wrote
On 11/20/21 11:06 AM, Antonio Carlini via cctalk wrote:
> On 20/11/2021 18:46, Paul Koning via cctalk wrote:
>> Is there an archive.org mirror?
>
> How many of us could afford the disk space? 30PB in 2016 apparently. I
> know that 10 years from now we'll all have PB drives, but right now it
> wou
On 11/20/21 11:35 AM, fozztexx--- via cctalk wrote:
>
> samdisk can decode Victor 9000 images. It's hard for me to fully test because
> neither of my Victors will boot from floppy and the hard disk I have seems to
> have been wiped. But the original disks that I've read using scp do seem to
> mo
On 11/19/21 6:33 PM, Steve Malikoff via cctalk wrote:
> Michael asked
>> What are we, as a community, to do to fix this and make sure that our
>> history stays peserved and isn't one bad day away from vanishing.
>
> Whenever some new vintage computing page appears I go to archive.org and
> submit
On 11/19/21 5:25 AM, Richard Cornwell via cctalk wrote:
> Hi Andrew,
>
> As the one who discovered Scope 3.0+ source I still have images.
> Note this is a build from source not a original image.
>
SCOPE 3.0+ covers an enormous range of distributions. SCOPE 3.1.6 (my
goto source for sev
On 11/18/21 7:08 PM, Andrew Warkentin via cctalk wrote:
> On 11/18/21, Michael Kerpan via cctalk wrote:
>> What happened? Looking back at my emails, the list was operating normally
>> until September 3. Then it just stopped. There were normal discussions
>> going on. There was no flood of spam. As
On 11/6/21 10:24 AM, David Gesswein via cctech wrote:
> On Fri, Nov 05, 2021 at 10:13:48PM -0500, David Williams wrote:
>> I have a TI monitor that has a power cord that is becoming sticky and gummy
>> and I'm looking at what to do with it.
>> Any other suggestions on dealing with the cord beside
On 11/2/21 12:13 PM, dwight via cctalk wrote:
> The trickiest protection I've seen is where there is a hole punched
> through the disk on one track. The idea is that the protected program
> writes to that track and expects to see a failure to read that
> track.
There were more floppy protection sc
Just as a follow up, I grabbed one of the Memorex "flippies" out of my
files:
https://i.imgur.com/3VnrazS.jpg
--Chuck
On 11/1/21 8:24 AM, mike wrote:
> I use a few Shugart 8" single sided drives on my cp/m 2.2 machine. How do
> you make 'flippies'?
>
> Mike Zahorik
Simple enough--Get yourself a hand punch like this one:
https://www.swingline.com/c/punches/?rslt=34
Using an old floppy jacket (sans cookie), plac
On 10/31/21 10:07 PM, Ali via cctalk wrote:
> "Computers that used the floppy index hole also required two additional
> openings in the floppy case to allow the drive to access when the disk was
> upside down. However, it was a difficult and risky operation for the
> integrity of the support. To f
On 10/31/21 3:40 PM, geneb via cctalk wrote:
>> On Sun, 31 Oct 2021, Chuck Guzis via cctalk wrote:
>> I've taped over the SS hole, but still have issues with the Applesauce
>> - I suspect I damaged it with all my messing around. I'll try hooking
>> it back u
On 10/31/21 1:06 PM, Douglas Taylor via cctalk wrote:
> I would like to use my tablet, Samsung Tab E model SM-T560NU, to connect
> to my VAX and Linux computers. There seem to be a large number of
> 'Apps' out there. What is a good one to use?
>
> The VAX doesn't have SSH only insecure TELNET.
On 10/31/21 12:14 PM, Fred Cisin via cctalk wrote:
> Put a piece of opaque tape over one of the holes.
> Make sure that it is solidly attached.
> I used to use write protect tabs.
> But aged write protect tabs rarely still stick well.
> And, it is a hassle to dig out ones that have fallen off insid
On 10/31/21 9:57 AM, geneb via cctalk wrote:
>
> I'm working with the developer of the Applesauce disk imaging tool in
> order to iron out some issues with 8" disk support.
>
> I'm using a Qumetrak 842 disk drive that's got support for both double
> and single-sided media. This means that it's e
On 10/30/21 7:38 PM, Jonathan Chapman via cctalk wrote:
> The belts are more or less all failing at this point, even on the newer
> multi-gigabyte QICs. I finally had to stop extracting the good ones from
> newer tapes, boiling, and reusing because that was not reliable anymore.
> Seems everyone
On 10/30/21 7:35 PM, Jonathan Chapman via cctalk wrote:
> It's definitely not Intel, but I pulled the control board and traced it a bit
> this afternoon. It seems to be very similar to the circuit used on the Intel
> MP7-03 1702A programming module for the MCS-4/MCS-8 development systems.
>
The
On 10/18/21 11:52 AM, Diane Bruce via cctalk wrote:
> On Sun, Oct 17, 2021 at 11:09:02PM -0400, Toby Thain via cctalk wrote:
>> Hi,
>>
>> I'd like to find homes for:
>>
>>22 x 11" reels
>>5 x 9"
>>2 x 7"
>>
>> Most rated up to 6250bpi, a handful to 3200bpi. Some CONTROL DATA
>> branded
On 10/1/21 5:04 PM, David Schmidt via cctalk wrote:
> On 10/1/21 1:00 PM, Chuck Guzis wrote:
>> Got a small batch (8) of Victor 9000 floppies, MSDOS ca. 1985. I
>> really don't want to write a decoder for such a small batch--I've got
>> other things on the burner right now. Anyone want to take
Got a small batch (8) of Victor 9000 floppies, MSDOS ca. 1985. I
really don't want to write a decoder for such a small batch--I've got
other things on the burner right now. Anyone want to take a crack at
transferring the data? (Funds available).
--Chuck
On 9/29/21 10:22 PM, Ethan Dicks via cctalk wrote:
>
> I started on 8-bitters. On minis, I first encountered EDT (on VMS),
> then Emacs (on UNIX, AmigaDOS, and even VMS), then years later when I
> was working for Lucent/Bell Labs, vi...
Okay, story time. Back in the early-mid 1970s, I found m
On 9/28/21 8:37 PM, John Herron via cctalk wrote:
> For those of you who wrote your own editors. How did you display special
> ASCII characters? Years ago, In highschool I tried writing a hex editor (in
> qbasic so this may have been the problem) but when display anything that
> had a function like
On 9/28/21 4:46 PM, Mike Katz wrote:
> Control-C, Control-X & Control-P for copy, cut and paste in Windows 11
> dates back to Wordstar on 8-Bit CPM systems in the 80s.
Are you certain about that?
Ctrl-C = Page down
Ctrl-X = Line down
Ctrl-P = not on WS
One way to remember this is to look at the
On 9/28/21 3:49 PM, Guy Sotomayor via cctalk wrote:
> Yes. There is an elisp package called EVIL (Extensible VI Layer) that
> emulates VI in EMACS.
I confess to having Wordstar so thoroughly burned into my reflexes that
I still use joe under linux.
Let's not forget MINCE, either. Ran on 8-bi
On 9/28/21 2:19 PM, Mike Katz via cctalk wrote:
> Editors are like religion once you have a favorite you defend it like
> crazy.
My lovely wife still uses QEdit under a DOS emulator running on Linux.
I occasionally still use an editor that I wrote for CP/M-80, and then
ported to MS-DOS. The adva
On 9/28/21 12:15 PM, ben via cctalk wrote:
> My next computer will be 44 bits, if I ever get the routing timing bugs
> out the FPGA
> prototype card. I can't change the FPGA vender because I can use TTL
> macros like 74181, for TTL bread boarding.
> With the 74181 I can have any width I want, thus
My .02 on this is that the computing world has changed a lot since the
1990s. Back when I was using RH 5, it was useful for server-side stuff
but as a general replacement for Windows desktops, it left a lot to be
desired. On the other hand, it was pretty stable. Eventually I moved
to an OpenBS
On 9/27/21 10:05 AM, dwight via cctalk wrote:
> Most of these older fused PROMs are of comparable speed in newer
> EPROMs or E2PROMs. Open collector is a hassle but not too much. One
> can create the needed circuits using surface mount parts for size
> reduction. A hassle but not out of the questio
On 9/18/21 9:15 AM, Fred Cisin via cctalk wrote:
> Clive Sinclair died at 81 after a long illness (probably not Covid)
>
>
> 'course now he is touted as being "the inventor of the pocket calculator"
> (as with all "FIRST"s, it leaves out a few predecessors,such as Busicom
> (1971, whose contract
As long as you don't need the full blower capacity, you can probably do
the 3-phase-to-single-phase trick by using a capacitor from the third
lead to either (which one will determine rotation direction) of the two
other leads and feeding those leads with single-phase. It's done very
often here wi
On 9/5/21 2:55 PM, Chuck Guzis via cctalk wrote:
> On 9/5/21 1:24 PM, Gabriel Nielson via cctalk wrote:
>> I was digging through the internet and found a post where a 3803 was posted
>> for sale, would there happen to still be one available?Preferably a model 2
>> Thank
On 9/5/21 1:24 PM, Gabriel Nielson via cctalk wrote:
> I was digging through the internet and found a post where a 3803 was posted
> for sale, would there happen to still be one available?Preferably a model 2
> Thanks,gcniel...@yahoo.com
>
Aside from a couple of sales of 3420+3803 drives about 5
On 8/28/21 3:01 PM, Jay Jaeger via cctalk wrote:
>
> Back in 2005 I imaged both my Mod I and Mod II floppies using my Altair
> and a program I wrote way way wayy back when for transferring floppy
> images called "XMT". But I like to image floppies two different ways,
> and the Greaseweazle ca
On 8/28/21 12:27 PM, Al Kossow via cctalk wrote:
> On 8/28/21 12:12 PM, Jay Jaeger via cctalk wrote:
>
>> I have successfully read a couple of Mod I disks (143KB). But some
>> have not read very well.
>
> I played with one when they came out. The software wasn't ready for
> prime time.
>
> I ha
On 8/27/21 10:22 PM, Mike Loewen via cctalk wrote:
>
> What's the recommended method for adjusting the track 0 switch and
> track 0 stop on a Tandon TM100-2, if you don't have an alignment disk? I
> do have a scope.
I'll also add that too many people go into the business of re-alignment
withou
On 8/27/21 10:22 PM, Mike Loewen via cctalk wrote:
>
> What's the recommended method for adjusting the track 0 switch and
> track 0 stop on a Tandon TM100-2, if you don't have an alignment disk? I
> do have a scope.
Just use a known-good disk and adjust for best results. That's about
all you
On 8/27/21 11:23 AM, Lee Courtney via cctalk wrote:
> Video interview I made with John (Maniotes) in preparation for donation of
> the 1620 program library to CHM - https://youtu.be/N12pQBiRd7A
I remember that name--he was at Purdue Calumet Campus. I probably even
met and talked to him 50+ years
On 8/26/21 7:16 PM, jim stephens via cctalk wrote:
/ printer / cpu setup wasn't too hard to run.
>
> Run assembler if you want to study for a while.
Back in the day, you knew that you'd arrived when you could mentally
assemble a one-liner console program and type it in without resorting to
pencil
On 8/26/21 5:14 PM, Ray Jewhurst via cctalk wrote:
> Hello all,
> Long time lurker, extremely rare poster, I was reading the Wikipedia
> article on the IBM 1620 and became quite intrigued. I know that there is a
> simulator for it on SimH but I have never ran or simulated any card-driven
> machine
On 8/25/21 3:58 PM, Mike Loewen via cctalk wrote:
On Wed, 24 Aug 2021, Mike Loewen via cctalk wrote:
>
> Back in the 2007 time frame, Andrew Lynch had written a utility to read
> Vector Graphic hard-sectored diskettes on a Catweasel board. Called
> "CWVG", does anyone have a copy of the program?
On 8/25/21 3:31 PM, Fred Cisin via cctalk wrote:
>> Later drives included both 100 TPI and 96 TPI (e.g. 1115-5 and -6).
>> For a 5.25" drive, a beast of one. No wonder they quit making floppy
>> drives.
The 1115/16 series was Micropolis' last gasp at floppy drives, I think.
Not the steel plate
On 8/25/21 1:57 PM, Fred Cisin via cctalk wrote:
> For 100tpi, there also existed Tandon TM100-4M drives. The M stood for
> "Micropolis". One of the TM100-4M drives that I had did not have the
> 'M' on the label.
The early Micropolis 48 tpi drives (1015 Mod I) were spec-ed at 35 tracks.
The 1
On 8/25/21 9:27 AM, Todd Goodman via cctalk wrote:
>
> Nope, the standard doesn't specify those bit sizes.
>
> Back in the 80s I was using the BBN C Machine with 10-bit bytes and
> happily building from source I picked up on the newsgroups with little
> issue
>
Or, you could simply be bit-addr
As a followup, I did find the following article about the Saxpy Matrix-1:
https://techmonitor.ai/techonology/the_saxpy_affair_and_why_we_all_have_to_worry_about_the_theft_of_its_secrets
--Chuck
On 8/24/21 10:40 AM, Van Snyder via cctalk wrote:
> That's the BLAS SAXPY (or DAXPY) routine, a fundamental step in
> Gaussian elimination.
Speaking of which, do any specimens of the Saxpy Matrix-1 still exist?
Saxpy Computer was a brief flash in the supercomputing universe; fell
onto bad times w
On 8/24/21 3:34 AM, Diane Bruce via cctalk wrote:
> Indeed. Just its addressing modes, with indirection and two separate register
> indexing operations, are hairy enough. Then consider the decimal arithmetic
> instructions that might have up to 6 operands.
>
> And who can ever forget the built
On 8/23/21 5:38 PM, Tom Stepleton via cctalk wrote:
Have a look at the instruction set for the STAR-100:
http://bitsavers.org/pdf/cdc/cyber/cyber_200/60256000_STAR-100hw_Dec75.pdf
I'm not quite sure if I've ever used a system with more
instructions+variations.
--Chuck
On 8/8/21 3:38 PM, Randy Dawson via cctech wrote:
> I found a few of the databooks here:
>
> https://usermanual.wiki/search.php?q=motorola%20semiconductor%20reference
>
Randy, if you're looking for Moto databooks, Al has archived a pile of
them on bitsavers:
http://bitsavers.org/components/moto
On 8/8/21 12:30 AM, Tony Duell via cctalk wrote:
> Note that many of these units contain 'selected' transistors. That's
> one reason for the house numbers. It may well be a 2N but one that
> has been tested for some parameter. Without knowing what it was tested
> for you are going to have 'fun
On 8/7/21 5:50 PM, r.stricklin via cctech wrote:
> Anyone have an early ‘80s Motorola semiconductor reference manual? I am
> attempting to repair a Boschert power supply from ~1983 that is full of
> Motorola parts marked as 1027 (DO-42ish), 1077 (TO-3ish), 1078 (DO-5ish),
> etc. It would be extr
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