On Wed, 27 Apr 2022, Cameron Kaiser via cctalk wrote:
Cameron, do they teach indecipherable handwriting in med school? Seems to be
universal!
It's probably the hand cramping after writing clinic notes all day.
Unexpectedly, electronic medical records have made my handwriting worse, not
better.
On Wed, 27 Apr 2022, Teo Zenios via cctalk wrote:
One of my mothers doctors just talks into a microphone and it does the typing
for him in real time.
YIKES!
I hope that he MANUALLY edits the results!
People that aren't familiar with such OFTEN have excessive confidence that
it is getting it ri
Next step...
Apparently mu original Tandon floppy has bought the farm.
Does anyone know what the jumper setting are for a
TEAC FD-55GFR-149 for the TRS-80 4P?
I tried the usual (like for a DEC RX-33) but that didn't
fly. Every sector fails verify after a format. I am sure
it's a jumper thing.
Double sided drives in 4P shouldn't require anything more than software
patches, to tell the OS (TRS-DOS, CP/M, etc.) that you have and want to
use the other side.
The Model 3 and 4 disk controller (did the 4P use the same one??) supports
double sided and uses pin32 as side select (as deity in
The Teac FD-55GFR is a 96tpi drive.?? It can replace a 55G (1.2M), or a 55F
(720K) depending on controller, but it still has a narrow head for doing 80
tracks. It will have to be jumpered to run at 300RPM, not 360.
On Thu, 5 May 2022, Bill Gunshannon via cctalk wrote:
It has a jumper that
To test the suspect drive, you could connect it to a PC; with DS1 jumpered
(instead of DS0), it should work as a "180K" (single sided "360K").
a PC with a floppy controller? Wow, is that ever retro.
Besides FDC (especially for PCI :-), current Windoze doesn't seem to even
know about single s
On Thu, Apr 21, 2022 at 10:34 PM Chuck Guzis wrote:
You could also bring the floppy cable out to a standard DC-37 connector
on a bracket, then use a ABCD switchbox to select whatever external
DC-37-cabled floppy drive you wanted.
On Thu, 5 May 2022, Charles Dickman via cctalk wrote:
Where woul
On Sat, 7 May 2022, Bill Gunshannon via cctalk wrote:
I had forgotten just how much fun the TRS-80's could be.
At least for the moment I am giving up on trying to get
a TEAC 55GFR to work and just grabbed a par of disks from
one of my COCOs to work with. I think one of the things
I need to do is
You can image them with Dave Dunfield's 765 utilities; GreaseWeazel
hardware isn't necessary.
On Sat, 7 May 2022, Bill Gunshannon via cctalk wrote:
Image them with what hardware? A PC or one of my TRS-80's?
Yes.
Either can do it.
If you can find a PC with a floppy drive, "normal" FDC andBIOS
On Mon, 9 May 2022, Bill Gunshannon via cctalk wrote:
I "duplicated" getting the prompts that I don;t think should be there.
All I have to do is try to boot from a bad disk. ie. Hit reset while
holding the "1" key with a non-bootable disk in drive 0:.
Sorry, to pester with irrelevant details,
Sorry, to pester with irrelevant details, . . .
On Mon, 9 May 2022, Bill Gunshannon via cctalk wrote:
Not pestering. I appreciate you taking the time to answer my questions.
I'm enjoying "going back to those days". But, I got out of TRS80 whenthe
PC was introduced. When the model4 came ou
On Tue, 10 May 2022, Bill Gunshannon via cctalk wrote:
DDensity. I thought there was a single command to make the system
part and then you just added the Utilities you wanted.
Was it SYSGEN?
are you running montezuma CP/M?
On Wed, 11 May 2022, Bill Gunshannon via cctalk wrote:
Among others.
TRS-DOS,, LDOS, LS-DOS, DOSPLUS, NEWDOS.
I could probably do CPM but at the moment the others are the
question.
I, also, thought that you were asking for Montezuma Micro when I mentioned
SYSG
https://m.youtube.com/watch?v=XoxpnZ__w5Q
On Wed, 11 May 2022, Bill Gunshannon via cctalk wrote:
That's a Tandy 2000. Not a TRS-80 at all and it was never called that
by Radio Shack. There are hundreds of YouTube videos on making MSDOS
bootable floppies. Being as all it really took was the f
On Wed, 11 May 2022, Bill Gunshannon via cctalk wrote:
That's the way I have always known it to be. Thus why I said if
I work on a project to build boot floppies from hard disk systems
I will have to have a collection of BOOT Code for the various OSes
and know how they use it. I guess the first
In the meantime (as a proof of concept?), you can manually read and write
sectors with SUPERZAP ?
On Wed, 11 May 2022, Bill Gunshannon via cctalk wrote:
Wow, SuperZAP. Time do build a System with NEWDOS80. :-)
Well, it's a good one to have.
There are lots of alternatives to SUPERZAP, inclu
What ever you do, don't use a Fairchild part. When I worked for Intel in
the 80's, we finally band using Fairchild for any latching device. They
failed on pullup current, even when the parts were sent back and they
claimed they were good. We just gave up on them, we couldn't hold
production whi
On Wed, 25 May 2022, Bill Gunshannon via cctalk wrote:
Another question for the masters here.
I just tried to revive my Model III. More than half the
keys don't work anymore. What is the conventional wisdom
on cleaning these old TRS-80 keyboards? Is compressed air
usually enough? Can I spray
On Thu, 21 Jul 2022, Kelly Leavitt via cctalk wrote:
I could be selling a mint working Apple I and I wouldn't get bids like this.
Well, if it is truly mint, it should bring up to $666.66
Is there going to be one this year?
Is there a reason why it never gets mentioned here?
(are there some personal issues that I shouldn't even ask about?)
I just saw an unknown to me connector listed on an eBay auction and was
wondering if anyone knows more about an "FS/2" connector.
Link - FS/2 to IBM PC-AT P-1940-0042 CABLE 6 FOOT FREE SHIPPING
- https://www.ebay.com/itm/304580270070
. . .
So ... does anyone know what an "FS/2" connector is?
O
https://www.handheldsystems.com/handhelds/ms-dos/fs3/fs3_access.htm
has one of those cables (or at least "P-1940-0042" part number) $125
For connecting an "Itron FS/3 to PC".
and a manual ("Developer's Guide") for an "Itronix Husky FS/2". $75
So, look for "Itronix/Itron Husky FS/2"
https://cybar
Itron/Itronix Husky FS/2 handheld computer
Handheld, using 3 AA batteries
8 x 40 display 240 x 64 pixel
(if you think that text on your phone is too easy to read, or got hooked
on Gavilan 8 line display)
FS/2 had an "4M RAM, 8086, and MS-DOS 3.30" according to first link
(considering the non-I
https://www.handheldsystems.com/handhelds/ms-dos/fs3/fs3_access.htm
has one of those cables (or at least "P-1940-0042" part number) $125
For connecting an "Itron FS/3 to PC".
and a manual ("Developer's Guide") for an "Itronix Husky FS/2". $75
So, look for "Itronix/Itron Husky FS/2"
https://cybarco
I feel like a Raspberry Pi or similar would fit the bill for this
nicely.
IMHO, the Raspberry Pi, et al. qualify here too.
On Sun, 31 Jul 2022, Ali via cctalk wrote:
Well after looking around a bit last night and my Google fu failing to
provide anything worthwhile Grant may be right i.e.
On Mon, 1 Aug 2022, Ryan de Laplante via cctalk wrote:
Has anyone ever seen promotional videos showing Prodigy, Compuserv,
Delphi, GENie, AOL? I've collected disks, but the systems are long gone
so archived video is all we have to remember them by. When I was young,
I remember seeing disks an
The greatest ever video about pre-WWW internet was "Hyperland".
a 1991 BBC documentary by Douglas Adams and Ted Nelson, and also starring Tom
Baker.
A few years BEFORE WWW, it predicted the future of the internet.
https://archive.org/details/DouglasAdams-Hyperland
If you want subtitles/captio
The greatest ever video about pre-WWW internet was "Hyperland".
a 1991 BBC documentary by Douglas Adams and Ted Nelson, and also starring Tom
Baker.
A few years BEFORE WWW, it predicted the future of the internet.
https://archive.org/details/DouglasAdams-Hyperland
If you want subtitles/captions,
On Tue, 2 Aug 2022, Ali via cctalk wrote:
Hello All,
Since the new hosting has taken over I am having a ton of issues posting to
the list. Anyone else experiencing legit posts being blocked as spam?
I generally have no problems at all with the list.
BUT, yesterday, when I posted about "Hyperlan
For fruit flies in kitchen put some apple vinegar in a cup, cover it with
saran wrap, make a few small holes in it with a knife and push the wrap
into the cup (not touching the vinegar) to make a dimple.
Works perfectly.
We use 2 parts molasses to one part apple vinegar. You don't even need th
Boston GB, Boston USA or Boston somewhere else?
On Tue, 9 Aug 2022, Dave Wade G4UGM via cctalk wrote:
There are apparently 16 Bostons in the USA
https://geotargit.com/citiespercountry.php?qcountry_code=US&qcity=Boston
Perhaps you could differentiate by how far it is from Springfield.
Boston GB, Boston USA or Boston somewhere else?
There are apparently 16 Bostons in the USA
https://geotargit.com/citiespercountry.php?qcountry_code=US&qcity=Boston
Perhaps you could differentiate by how far it is from Springfield.
On Tue, 9 Aug 2022, Warner Losh wrote:
Or how far it is fr
When I got my Micropolis I drive to use on TRS80, it came with a yellow?
loose leaf binder with a Micropolis Operating System.
Sadly, and shamefully, I never got around to trying that.
he drive was 48tpi, 35 track, in a nice blue box. It was slow, (helicaal
lead screw), but not any slower than
I think it was Dysan that first showed up with reinforcing ring kits to
be applied to disks to ameliorate the problem, but ultimately the
solution turned out to be making sure that the motor was on during the
seating process. That's why, for example, 5.25" DD media usually has
hub reinforcement,
On Tue, 16 Aug 2022, Bill Degnan via cctalk wrote:
Unrelated factoid. Did you know the Micropolis 1033-II drive is at least
semi-compatible with the Tandy Model 1 Expansion Unit with disk capacity
daugher card / "doubler" setup? Wonder if anyone ever tried this other
than myself.
If you have a
> I have to ask, which is tragic? Needing to lookup SA400, or the fact
> that webpage (from the Smithsonian), indicates it~@~Ys a 3 1/4~@~]
> drive. That wasn~@~Yt typo on my part they say *three*.
On the Smithsonian webpage, to add to the tragedy:
Note: Comment submission is temporarily unav
On Sat, 20 Aug 2022, Chuck Guzis via cctalk wrote:
field use, so it was acceptable to record tracks at various offsets to
get a good idea of how far from the radial ideal the customer's drives
were. I'm a bit surprised with the call for finding alignment disks,
that this hasn't been done in the
1) because they need to keep reinforcing until the very last SA400 is
buried.
On Sat, 20 Aug 2022, geneb via cctalk wrote:
Fred, Don't forget the SA390 in every Disk II. ;)
The first Disk II's were SA400's with the logic board removed.
Once they had volume (not prototypes), Shugart started le
The Dysan Digital Diagnostic Diskette included track(s) where SECTORS
were recorded progressively offset!
I can visualize, and am impressed with, how you offset tracks for
alignment diskettes, but I'm having difficulty imagining the Dysan
mechanism. Large intersector gaps, and a separate pass for
nt: Saturday, August 20, 2022 7:47 AM
To: Liam Proven via cctalk
Cc: geneb
Subject: [cctalk] Re: "Revival" of a dedicated Micropolis webpage on internet
On Wed, 17 Aug 2022, Liam Proven via cctalk wrote:
On Tue, 16 Aug 2022 at 23:51, Fred Cisin via cctalk
wrote:
1) because they nee
On Sun, 21 Aug 2022, Chuck Guzis via cctalk wrote:
Thinking about it a bit more, I wonder if the standard "litany" for
retrying read errors on floppies was due to the disc-and-follower of the
SA400, more so than the leadscrew of the Micropolis. I doubt that
there's much of a difference with the
On Sun, 21 Aug 2022, Tom Gardner via cctalk wrote:
The only person who ever promulgated the "Dr. Wang bar napkin" story was Jim
Porter who was not in any way involved with the decision as to the size of
the 5½ drive or media size and only began telling his tale many years after
the decision.
Both
On Sun, 21 Aug 2022, Ali wrote:
You should just do it and add a teeny tiny disclaimer at the bottom
regarding the veracity of the story. It would make for a great gag gift!
Or if you want to get real fancy have a QR code that can be scanned on
each napkin for a site with more detailed discussio
BTW, I first heard the story in the late 1980s? My recollection was that
it was in a sidebar in a magazine article. I can't currently find that.
Massaro's denial of it
http://archive.computerhistory.org/resources/text/Oral_History/5.25_3.5_Floppy_Drive/5.25_and_3.5_Floppy_Panel.oral_history.20
On Mon, 22 Aug 2022, W2HX wrote:
I always thought it was interesting how 5 1/4 is 3U (rack units). I
thought there might have been some relationship to that. But could have
been just coincidence.
I think that it is related.
I think that the drive (not the diskette) was apparently intended to b
On Sun, 21 Aug 2022, Tom Gardner wrote:
Fred:
Please quote the current version of the oral history,
It says:
Porter: Jimmy said that you guys got together with the guys at Wang in a
dark bar one night and, after a
discussion, you decided on the size of what the smaller diskette should be
and ther
no avail
Tom
-----Original Message-
From: Fred Cisin [mailto:ci...@xenosoft.com]
Sent: Sunday, August 21, 2022 11:32 PM
To: t.gard...@computer.org
Cc: 'General Discussion: On-Topic and Off-Topic Posts'
Subject: RE: [cctalk] Re: Wang bar napkin story [WAS:RE: Re: "Revival" of a
de
On Thu, 25 Aug 2022, Ali via cctalk wrote:
Out of curiosity what is the model number of the Micropolis drives? I
would like to find a picture of them on the net if possible and see this
precision-ground lead screw mechanism. Thanks.
I'm not Chuck, and I don't have a picture handy.
The pictures
for almost everything, you would want either double sided 48tpi with 40
tracks ("360K"),
or double sided 96tpi "high density" (for 1.2M).
or double sided 96tpi 80 track (for most "quad density" systems),
They made such, but I never had any other than the 35 and 77 track single
sided ones.
shou
On Wed, 17 Aug 2022, Liam Proven via cctalk wrote:
I had to look up SA400. I'm too young.
The Smithsonian has one. They say it's a 3¼ inch drive.
https://www.si.edu/object/microcomputer-peripheral-shugart-sa400-disk-drive:nmah_334325
*Sigh*
Tom Gardner has successfully gotten
https://americanhi
On Wed, 31 Aug 2022, Liam Proven via cctalk wrote:
Someone on Fesse Bouc just found a sealed box of SS/SD 8" floppies in
their garage.
Most FB types are too young to know 8" disks existed, of course.
Someone suggested punching a notch in them and using both sides.
Was that even possible on 8" dis
On Wed, 31 Aug 2022, Liam Proven via cctalk wrote:
Someone on Fesse Bouc just found a sealed box of SS/SD 8" floppies in
their garage.
Most FB types are too young to know 8" disks existed, of course.
About 3 decades ago, my assistant (Bob Fink) came up with an advertising
campaign for XenoCopy
Sad day when AOL changed to CDs and you then had to make
coasters or trash them.
On Thu, 1 Sep 2022, Alan Frisbie via cctalk wrote:
My wife and our neighbor use them as reflectors to scare birds away from
her garden. We finally ran out of the AOL CDs and are now working on my
backlog of MSDN C
On Thu, 1 Sep 2022, Sellam Abraham via cctalk wrote:
This is because, like Apple ][ drives, they used GCR encoding and looked
for sync bytes on the disk rather than implementing additional hardware to
look for the index hole.
Sellam
Well, it's not really just the GCR that does that.
On the IBM
On Thu, 1 Sep 2022, Chuck Guzis via cctalk wrote:
I'm sitting here with a customer's 8" floppy in front of me. The
manufacturer's label is simply "Diskette" on both front and back with
the usual "Diskette No." legend and "Side 1" or "Side 2" respectively.
The curious thing is that this disk is n
On 9/1/22 18:43, Mike Katz wrote:
Taking my memory back to the early 1980's and the Western Digital floppy
disk controller chip family (177X single density and 179X double
density). I wrote the 6809 drivers for Gimix Flex. The controller chip
used the index pulse for sector zero position and fo
How do they handle the issue of how the drive knows whether it is SS, DS,
or SS flippy? Or is it assumed that that problem is for the host FDC?
(some DS drives had both SS and DS index sensors, so that they could read
SS in the DS drive, and such a drive is going to see TWO index pulses with
this
On Fri, 2 Sep 2022, geneb via cctalk wrote:
All the discussion around 8" disks reminded me about a question I've not been
able to find an answer to.
I've got a Qumetrak 842 drive that I use for imaging 8" disks with either
ImageDisk or AppleSauce. When I first tried it out with AS, the listed R
On Thu, 1 Sep 2022, David Barto via cctalk wrote:
If you have a SS/SD drive then yes, punching a notch in the sleeve
would allow you to flip the disk over and use the other side. I’ve done
this in the (very) distant past.
Most drives these days are DS and can R/W the SD disks without
issue, so I
On Sat, 3 Sep 2022, Sellam Abraham via cctalk wrote:
I think there's a rather large disparity in value between the two systems.
I'm not sure what an IBM 5100 would go for these days, but a Lisa 1 will
generally sell in the $10K+ range minimum these days.
I had two Lisa's with Twiggy drives: one I
On Sun, 4 Sep 2022, dwight via cctalk wrote:
When punching holes in the envelope I've always had a piece of thin cardboard
between the back of the punch and the disk. I've never had a problem this way.
I damaged a disk once with the punch and the lesson was learned.
You just cut the cardboard t
Well, it ain't in the 5150/5160 range!
The 5100 new was $10K to $20K.
On Sun, 4 Sep 2022, jim stephens wrote:
I had a 5100 that a dentist had bought as soon as it came out and he
added the floppy drives and printer. It was a direct IBM buy for 31000.
On Mon, 5 Sep 2022, Christian Corti via c
I played briefly with a pre-release Lisa (Berkeley Smalltalk). But then
didn't see them again. I almost bought one later as a cheaper substitute
for a Mac!
It is historically significant.
So is the 5100.
But, they are totally different categories. It's like when I traded a
Honda for a Leic
Might I suggest, that in addition to the date, it would be convenient if
the subject of the message mentions city and state?
There are CLUES, and it is not very hard to track it down, but not
everybody happens to know where InfoAge is, so it would be more convenient
if you stated it.
On Sun
Might I suggest, that in addition to the date, it would be convenient if
the subject of the message mentions city and state?
There are CLUES, and it is not very hard to track it down, but not
everybody happens to know where InfoAge is, so it would be more convenient
if you stated it.
On Sun, 1
On Sun, 11 Sep 2022, Nigel Johnson Ham via cctalk wrote:
Be careful to not walk on the wrong side of the street. there is something
military on the side opposite the hall and guards will quickly come and tell
you to stay away!
73,
Nigel ve3id
My mother once got a flat tire on the George Wash
On Wed, 21 Sep 2022, Eric Smith via cctalk wrote:
They didn't deal with it at all. It didn't work. No normal 8-inch
floppy disks have both index holes in the jacket. If you convert a
disk from SS to DS, or vice versa, by punching the other index hole in
the jacket, you have to cover the origina
Cut a hole in the wall.
Mount the front panel on the wall, with the machine, still connected to
it, on the other side of the wall.
(like an ancient New Yorker cartoon, of an elephant head on the wall, with
the rest of the elephant standing on the other side of the wall.)
I had an ex, decade
On Fri, 23 Sep 2022, Paul Koning via cctalk wrote:
There might be some exceptions: a spare RF11 or RC11/RS64 platter merely
needs to be bolted to the spindle hub and formatted, that's a normal
field repair procedure. But, say, a platter out of an RP04 pack is
unlikely ever to be able to serve
On Fri, 23 Sep 2022, Randy Dawson via cctalk wrote:
On the top secret number cruching
The Cray had an instruction called 'population count'
asked for by the NSA.
The number of bits on in a word, not sure what this was used for.
Interesting.
A friend of my ex was asked to code that (in C) a
On Fri, 23 Sep 2022, ben via cctalk wrote:
Just how do the supercomputer do i/o for all that floating numbers.
Weather maps I can see for output, but what about all that Top Secret
number crunching.
Ben.
In one of my first jobs (a gopher for a british physicist, studying Van
Allen belts, in Na
> I was curious if anyone recognizes this punched card reader. Marked:
> AMP Incorporated - SYSCOM Division.
On Fri, 7 Oct 2022, Dennis Boone via cctalk wrote:
Can't help with the identity, but I'm loving the 9 edge hanging out the
front in contravention of the instruction label! :)
Apparently
I was curious if anyone recognizes this punched card reader. Marked:
AMP Incorporated - SYSCOM Division.
Can't help with the identity, but I'm loving the 9 edge hanging out the
front in contravention of the instruction label! :)
Apparently AMP didn't know the "face down nine edge first" song...
On Tue, 11 Oct 2022, Bill Gunshannon via cctalk wrote:
On the other side of the coin... I once tried to sell a couple
Chilton's car manuals. The shipping price I quoted was the cost
of a "If it fits, it ships" USPS envelope. eBay refused to let
me do it claiming the shipping charges were too h
On Tue, 11 Oct 2022, Cory Heisterkamp via cctalk wrote:
If the seller has a few “worthless” diskettes laying around, he can
include one in each case and now the package qualifies under media mail
rates. I won’t speak to the ethics of it, but it is technically
allowed per USPS’ rules.
Accordin
If the seller has a few “worthless” diskettes laying around, he can
include one in each case and now the package qualifies under media mail
rates. I won’t speak to the ethics of it, but it is technically
allowed per USPS’ rules.
According to USPS, that is not acceptable for blank, nor even user-
If the seller has a few “worthless” diskettes laying around, he can
include one in each case and now the package qualifies under media mail
rates. I won’t speak to the ethics of it, but it is technically
allowed per USPS’ rules.
According to USPS, that is not acceptable for blank, nor even user-w
"Media mail" is the only practical option for those.
THAT comment was actuaally in reply to somebody who had a problem with the
cost of shipping Chilton automotive books, where media mail is the ONLY
practical option.
And, blank, or user-written diskettes don't qualify; according to the
pos
From the USPS Domestic Mail Manual, section 170, subsection 4.1(i):
"Computer-readable media containing prerecorded information and guides or
scripts prepared solely for use with such media."
On Wed, 12 Oct 2022, Jonathan Chapman via cctalk wrote:
I've asked and our postmaster has said anything
On Mon, 17 Oct 2022, Bill Degnan via cctalk wrote:
Who presently has the largest predominantly "vintage computing" collections
in 2022? I sometimes wonder what the cutoff definition is for "very large
collection" ... 1000 individual computers? Or do you judge by square feet
filled?
Well "larg
. . . and there is the point where it crosses over
fromyou owning the collection,
to the collection owning you.
On Mon, 17 Oct 2022, Zane Healy via cctalk wrote:
On Oct 17, 2022, at 6:30 PM, Bill Degnan via cctalk
wrote:
However you define it, who has the largest private collections? Is
On Mon, 17 Oct 2022, Sellam Abraham via cctalk wrote:
I used to claim "largest privately held collection on the planet" and no
one ever challenged me.
I like to think of it in terms of atoms, because empty space is just a
vacuum.
On that account, I control a tremendous number of atoms.
Sellam
All you need is a the local government to declare eminent domain and
greater user for the public good.
Arthur Dent's home, and planet, were bulldozed to make way for bypasses.
On Thu, 3 Nov 2022, Grant Taylor via cctalk wrote:
Does anyone have a 101 level boot strap guide for someone wanting to get into
creating better-than-dd disk images?
I'm finding myself back in a position where I want to image / preserve
multiple 5¼ & 3½ inch disks. I think all of them are PC co
Note that some disk types are CLV, not CAV (e.g. some Mac disks), and
reading them without additional hardware support may be problematic.
On Thu, 3 Nov 2022, Grant Taylor via cctalk wrote:
Is Constant Linear vs Angular Velocity (?) anything I need to worry about
when sticking within the IBM PC
But, why do IMAGING on PC-DOS disks?
On Thu, 3 Nov 2022, Grant Taylor via cctalk wrote:
My /personal/ and primary use case is for use in virtual machines where disk
images (a la dd) is best (in my experience).
THAT is a totally valid reason for disk images, rather than file copies.
Another,
On Thu, 3 Nov 2022, Sellam Abraham via cctalk wrote:
Fred,
The Victor/Sirius 9000 was sort of PC compatible and featured a varial
speed floppy format, no?
Although MS-DOS capable, the Victor/Sirius 9000 was FAR from PC
compatible!
An amazing machine, but NOT PC compatible.
It is an ideal exa
> Is there a reason to do a real IMAGE backup, rather than a file
> backup?
On Thu, 3 Nov 2022, Dennis Boone via cctalk wrote:
People have occasionally found interesting things in the unallocated
sectors of disks. For garden variety PC format disks, it's not
necessary to do flux imaging to pre
Also GCR, not MFM. NOT readable with a PC FDC.
On Thu, 3 Nov 2022, Grant Taylor via cctalk wrote:
Please expand "GCR".
Sure, . . . (GROSSLY OVER-SIMPLIFIED, such as "pulse" instead of flux
transition)
FM is "frequency modulated". Well, it is actually a regular clock pulse,
with data bit
> Is Constant Linear vs Angular Velocity (?) anything I need to worry
> about when sticking within the IBM PC compatible line from say '90
> forward?
On Thu, 3 Nov 2022, Dennis Boone via cctalk wrote:
There aren't that many platforms that used CLV drives. I don't recall
seeing one in the PC wo
GCR stands for "group Coded Record"
On Thu, 3 Nov 2022, Fred Cisin via cctalk wrote:
Also GCR, not MFM. NOT readable with a PC FDC.
On Thu, 3 Nov 2022, Grant Taylor via cctalk wrote:
Please expand "GCR".
Sure, . . . (GROSSLY OVER-SIMPLIFIED, such as "pulse&quo
On Thu, 3 Nov 2022, Paul Koning via cctalk wrote:
An example of a non-PC format 5.25 inch disk that normal drives can read
would be the DEC RX50 floppy, which has 10 sectors per track rather than
the PC standard 9 sectors. But a standard drive will read and write
those just fine, if it's told
On Thu, 3 Nov 2022, Sellam Abraham via cctalk wrote:
There was a project someone did years ago where you can read GCR disks in
an unmodified PC drive by first inserting a PC formatted disk to get synced
and then swapping in a GCR encoded disk, then it can actually read the raw
pulses and they get
On Thu, 3 Nov 2022, Mike Katz via cctalk wrote:
GCR is Group Code Recording, used on the Apple II, Commodore 1541 drive and
Amiga (and others) use a different encoding scheme than the normal FM
(Frequency Modulation) or MFM (Modified Frequency Modulation) encoding
formats used by a majority of
Something quite similar, . . . (probably a hassle to switch over) I had a
KVM switch, that permitted two computers to share one keyboard mouse,
monitor, and speakers. DE15, two USB ports and a headphone jack (IOGear
GCS632U?) It apparently watched for a hotkey from the keyboard to
activate sw
Or even cheaper, a dumpstered/e-waste PC
On Fri, 11 Nov 2022, Nigel Johnson Ham via cctalk wrote:
Or even cheaper, and Arduino uno
cheers,
Nigel
Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the open-source concept!
Skype: TILBURY2591
On 2022-11-11 16:2
On Fri, 11 Nov 2022, Chuck Guzis via cctalk wrote:
I keep a big jar around that's full of blue- and black pill MCU boards,
as well as a few of the more capable STM32F4 and F7 boards.Nowadays,
everything seems to look like a job for an MCU.
The MCU has replaced the hammer!
. . . "To a man w
1) A piece of tamper-proof tape, labeled "breaking this seal voids
warranty". If you do major modifications to something, such as a TRS80
model 1, always put a fresh tamper-evident seal on it afterwards, to
re-enable the warranty.
2) Also called a "tape hanger", a piece of plastic that wraps
1) A piece of tamper-proof tape, labeled "breaking this seal voids
warranty". If you do major modifications to something, such as a TRS80
model 1, always put a fresh tamper-evident seal on it afterwards, to
re-enable the warranty.
On Mon, 14 Nov 2022, geneb wrote:
It's a lot less effort to te
It's a lot less effort to tell them the sticker was illegal to begin with.
;)
. . . and have him have to escalate it to somebody authorized to make
exceptions, or argue with tandy lawyers?
On Mon, 14 Nov 2022, geneb via cctalk wrote:
Nope. You point out that the state attorney(sp) general woul
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