On 4/24/24 15:32, ben via cctalk wrote:
> https://www.youtube.com/watch?v=iJeu3LCo-6A
> Dr who ads for prime.
I think old Dr. Who shows are also on Pluto TV.
--Chuck (not a fan)
On 4/24/24 13:10, David Brownlee via cctalk wrote:
> Typically the second processor would run as primary, using the
> original 6502 to handle input, display and I/O (and on 32016 you
> *really* wanted someone else to deal with anything time critical like
> interrupts :)
Thats the way we did it
On 4/24/24 11:34, Fred Cisin wrote:
>>>> Did the Dimension 68000 (a multi-processor machine) have Z80 and 6502?
>
> On Tue, 23 Apr 2024, Chuck Guzis via cctalk wrote:
>> Couldn't Bill Godbout's CPU-68K board co-exist with other CPU boards?
>
> Did he, or anybody els
On 4/24/24 10:54, Robert Feldman via cctalk wrote:
> The Otrona Attache 8:16 had a Z80A and an 8086 on a daughter card.
Of course, Godbout offered the S100 85/88 board in the same vein.
--CHuck
On 4/23/24 21:06, ben via cctalk wrote:
>>
> I remember Bill Godbout's PACE ads. Now I got the $$$ and time I can't
> find any chips.
National was handing the chips with manuals out for free at on WESCON--I
got mine there, built up an S100 board with all of the interface logic
(I think the PACE
On 4/23/24 17:18, Bill Gunshannon via cctalk wrote:
>
>
> On 4/23/2024 8:06 PM, Fred Cisin via cctalk wrote:
>> Did the Dimension 68000 (a multi-processor machine) have Z80 and 6502?
Couldn't Bill Godbout's CPU-68K board co-exist with other CPU boards?
--Chuck
On 4/22/24 20:36, Chris Elmquist wrote:
> Hey, I did that on Sunday afternoons on the Star-100 with Lincoln and his son
> PD when I was in 8th grade. I never became a manager though :-)
>
> Chris
Trying to remember, was the star the same as the 6000 as far as wiring?
That is, twisted pair and
On 4/22/24 17:35, Paul Koning wrote:
> What about the coincidence that a lot of today's logic runs on 3.3 volts,
> just about the same as the first generation of IC logic (RTL).
I think I still have some survivors from the Motorola HEP mwRTL kit.
TO-100, I think. RTL was pretty cool--slow,
On 4/22/24 14:34, dwight via cctalk wrote:
> For those that don't know what a UV(UX)201 was, it was most commonly used for
> audio amplification in early battery powered radios. These used a lot of
> filament current, not like later miniature tubes.
> They had a UV(UX)200 tube for RF detections
On 4/22/24 14:04, Paul Koning wrote:
> I never had my hands on a 6600, only a 6400 which is a single unit machine.
> So I had to do some thinking to understand why someone would do a register
> transfer with L (shift operation) rather than B (boolean operation) when I
> first saw that in my
On 4/22/24 13:53, Paul Koning via cctalk wrote:
> In COMPASS:
>
> MORE SA1 A1+B2 (B2 = 2)
> SA2 A2+B2
> BX6 X1
> LX7 X2
> SB3 B3-2
> SA6 A6+B2
> SA7 A7+B2
> PL b3,MORE
My recollection is that putting the stores
On 4/22/24 13:53, Paul Koning via cctalk wrote:
> In COMPASS:
>
> MORE SA1 A1+B2 (B2 = 2)
> SA2 A2+B2
> BX6 X1
> LX7 X2
> SB3 B3-2
> SA6 A6+B2
> SA7 A7+B2
> PL b3,MORE
On 4/22/24 13:02, Wayne S wrote:
> I read somewhere that the cable lengths were expressly engineered to provide
> that signals arrived to chips at nearly the same time so as to reduce chip
> “wait” times and provide more speed.
That certainly was true for the 6600. My unit manager, fresh out
On 4/22/24 12:31, ben via cctalk wrote:
>
>
> Classic cpu designs like the PDP-1, might be better called RISC.
> Back then you matched the cpu word length to data you were using.
> 40 bits made a lot of sense for real computing, even if you
> had no RAM memory at the time, just drum.
I'd call
On 4/22/24 11:46, Paul Koning wrote:
>
> Probably not. Cycle accurate simulation is very hard. It's only rarely been
> done for any CPU, and if done it tends to be incredibly slow. I remember
> once using a MIPS cycle-accurate simulator (for the SB-1, the core inside the
> SB-1250, later
On 4/22/24 11:09, Bill Gunshannon via cctalk wrote:
>
> Following along this line of thought but also in regards all our
> other small CPUs
>
> Would it not be possible to use something like a Blue Pill to make
> a small board (small enough to actually fit in the CPU socket) that
> emulated
A bit of a postscript: The ALU on the 8085 according to Ken is 8 bits wide.
https://www.righto.com/2013/01/inside-alu-of-8085-microprocessor.html
--Chuck
On 4/22/24 09:54, Lamar Owen via cctalk wrote:
> On 4/22/24 12:18, Chuck Guzis via cctalk wrote:
>> I don't know if this applies to the Z80, but on the 8080, 16-bit
>> increment/decrement is handled by a separate increment block (also used
>> to advance the P-counter
On 4/22/24 08:36, Lamar Owen via cctalk wrote:
> Die real estate forced the design to do without a full 8-bit ALU. When
> you have a 4-bit ALU, and you are doing 16-bit math, you will need 4
> cycles through the ALU.
I don't know if this applies to the Z80, but on the 8080, 16-bit
On 4/21/24 17:44, ben via cctalk wrote:
> On 2024-04-21 5:26 p.m., Chuck Guzis via cctalk wrote:
>> On 4/21/24 12:11, ben via cctalk wrote:
>>> I keep finding I still need 74XX just for having 10 TTL loads,
>>> and 74LSXX just does not have the power.
>>
On 4/21/24 12:11, ben via cctalk wrote:
> I keep finding I still need 74XX just for having 10 TTL loads,
> and 74LSXX just does not have the power.
Ever try BiCMOS chips? IIRC, the 74ABTxxx will drive loads of up to 60
ma, far in excess of old 74xx parts.
--Chuck
On 4/21/24 09:37, Mike Katz wrote:
> Even the 6809 could push up to 8 registers (up to 10 bytes) at once on
> one of two stacks in a single two byte instruction.
The 6809 was introduced the same year as the 8086. The 80186,
introduced in 1982, did have the "PUSHA POPA" instructions and was
On 4/21/24 07:45, Mike Katz via cctalk wrote:
> One of the biggest features of the Z-80, the extra register set, was
> rarely used in open source software in order to maintain compatibility
> with the 8080.
My understanding of the extra (partial) set of registers on the Z80 was
that they were
On 4/20/24 01:37, Peter Corlett via cctalk wrote:
> There's this thing called "inflation", which does tend to become somewhat
> significant after four decades.
>
> In the mid-80s, a pint of beer cost about 70 pence. I've escaped that
> benighted island, but according to friends who were not so
On 4/19/24 19:39, ben via cctalk wrote:
> There still are RADIO SHACK 8080A's still on ebay, with @RARE@ prices.
> NO thank you, z80's are the way to go.
I found 8085 generally easier to work with, but that's just me.
> Now is a good time to stock up for any z80 projects
> or repair, while they
On 4/19/24 11:55, Peter Schow via cctalk wrote:
>
> https://www.mouser.com/PCN/Littelfuse_PCN_Z84C00.pdf
>
I should add parenthetically that in my wildest fevered dreams did I
ever think that Zilog would be a division of Littlefuse--even after the
Exxon debacle.
--Chuck
On 4/19/24 11:55, Peter Schow via cctalk wrote:
> In case you missed it, Zilog has issued a Last Buy notification for the Z80:
>
> https://www.mouser.com/PCN/Littelfuse_PCN_Z84C00.pdf
>
> Looks like Mouser and Digikey still have decent inventory of them.
There should still be a reliable supply
On 4/18/24 14:01, paul.kimpel--- via cctalk wrote:
> The tape for the Burroughs 220 drives was not metallic. It was 3/4-inch wide,
> and I think a Mylar sandwich. It could be spliced much the same way you would
> have spliced quarter-inch reel-to-reel audio tape back in the day.
>
The Datamatic
Don't know if it's germane, but the CDC STAR-100 (Cyber 200 series) MCU
used a small drum. 70s-80s. Don't recall if the stations did also.
There was the "STAR Drum" blue sky that was part of the boilerplate in
proposals at the time. STAR had a 512-bit wide data channel reserved
for a paging
On 4/13/24 11:22, Michael Thompson via cctalk wrote:
>>> On Apr 12, 2024, at 9:55 PM, ben via cctalk
>> wrote:
>>>
>>> Did any one ever use a keyboard to magtape as input device?
>>
>> My wife did, sort of: for a while she worked with IBM MT/ST word
>> processors. Those were very early word
On 4/13/24 10:20, Paul Koning via cctalk wrote:
>
>
> PLATO was the system where a whole lot of early games first appeared,
> especially multi-player games. Among them were any number of variations of
> "Star Trek" inspired ones. While you couldn't refresh a screen full of space
> ships in
On 4/12/24 14:27, Van Snyder via cctalk wrote:
> On Fri, 2024-04-12 at 16:13 -0400, Paul Koning via cctalk wrote:
>> Not all that fast, well, it depends on what you're comparing with.
>> Given tube logic with cycle times measures in microseconds, quite
>> possibly serial rather than parallel
On 4/12/24 14:54, CAREY SCHUG via cctalk wrote:
> https://en.wikipedia.org/wiki/List_of_IBM_products for genuine ibm devices.
>
> Calcomp (and others?) had automated tape libraries for reel to reel taps.
> The cartridge tape library that staged onto 3350s (and later 3380s?)
The
On 4/12/24 12:04, Paul Koning via cctalk wrote:
> I remember a concept for a very fast magnetic storage system that didn't
> become a product, as far as I know. The scheme was to build a large array of
> heads, using IC-manufacturing type techniques, and mount that array in
> contact or
On 4/12/24 11:10, Tom Gardner via cctalk wrote:
problems too and in the end I'm told it was a rather successful product.
>
> NCR CRAM (Card Random Access Memory) truly considered magnetic cards as the
> media, see
> https://www.computerhistory.org/brochures/m-p/national-cash-register-company
>
On 4/12/24 09:45, Christian Kennedy via cctalk wrote:
>
> On 4/12/24 05:31, Paul Koning via cctalk wrote
>
> [snip]
>> Yes. See also https://en.wikipedia.org/wiki/IBM_2321_Data_Cell . By
>> the standards of the time it was an unusually high capacity storage
>> device, way faster than a room
On 4/11/24 11:01, Fred Cisin via cctalk wrote:
> Then, there was the "64-256KB" motherboard. It had one row of 4164s
> soldered in, and three rows of sockets. Populating those with 4164s
> gave you 256K of RAM. BUT, there was an empty socket on the board, that
> you could populate; I don't know
On 4/10/24 10:20, Jon Elson via cctalk wrote:
> OK, never worked on one, I did actually see one in a tour once. So,
> there's a lot I don't know about the /20. Thanks for the correction.
In point of fact, given the constraints posed by the small register file
and lack of instructions, the
On 4/10/24 08:17, Jon Elson via cctalk wrote:
> The 360/20 had only halfword instructions, no float, no char strings.
> But, main storage was 16 bits wide.
>
I'm not quite sure what you mean by "char strings", but SS instructions
MVC, MVN, MVZ, CLC, ED, TR were in the set, (but not, say, TRT,
On 4/10/24 08:11, Jon Elson via cctalk wrote:
> On 4/10/24 00:21, Chuck Guzis via cctalk wrote:
>> On 4/9/24 22:03, ben via cctalk wrote:
>>>
>> What model of a 360? 8K sounds a lot like a Model 20, which the purists
>> may not consider to be a "real"
On 4/9/24 23:51, Van Snyder via cctalk wrote:
> I don't remember whether it was one of the docents at Haus zur
> Geschichte der IBM Datenverarbeitung at Sindelfingen, or at the
> Computer History Museum at Mountain View, who told me that IBM was
> developing a machine to be designated 1480, as
On 4/9/24 22:03, ben via cctalk wrote:
> On 2024-04-09 8:53 p.m., Murray McCullough via cctalk wrote:
>> I had not realized the IBM 360 was 60 yrs. old this month. I worked on
>> such
>> a computer in the late 60s in Toronto. What one could do with 8 Kbytes of
>> ram was remarkable!
>>
>> Happy
On 4/4/24 09:54, CAREY SCHUG wrote:
> my syquests say 135 mb, though IIRC that must be raw, because useable was a
> more even number, like 125mb, which the formatting program agreed with. I
> made it my c: drive on my I386 pc so I could switch operating systems before
> virtualization. I was
On 4/4/24 09:27, Bill Gunshannon via cctalk wrote:
>
> Was there any other kind?
>
> Oh yeah, I also have one marketed for use on the Mac. It says 88M
> on the front.
Zip, Jazall Iomega. The Zips were 100MB, 250MB and 750MB. The Jaz
was 1 GB and 2 GB, if memory serves.
The 88M sounds
On 4/4/24 08:05, Bill Gunshannon via cctalk wrote:
> One more list before I give up.
>
> Anybody interested in Iomega drive?
>
> I have:
> 2 - 90 Pro
> 2 - 150 Multidisk
> and somewhere here I have a 230M but I haven't come across it yet.
>
> To go along with them I have:
>
On 4/3/24 09:01, Mike Katz via cctalk wrote:
> I still have a TEK 475A (with the DMM4 on top) and a TEK 11043A
> mainframe scope.
I still occasionally haul out my 465A. If I got rid of it, I'd have to
figure out what to do with the scope cart...
--Chuck
Well, if you're after an EMP-tolerant oscilloscope, there's always the
mirror-galvanometer + rotating mirror variety. Precedes the development
of the CRT by quite a bit. Runs fine with clockwork.
It's amazing what can be done with simple electrics and mechanics.
Anyone remember using the
Back in the day (early 90s, IIRC), there was a package called "SyDupe"
from modesty-forbids. It could use up to 3 diskette controllers, each
with up to 4 drives (grand total 3). Simultaneously copying three disks,
sensing disk changes, so no keyboard interaction aside from startup.
Stick a disk
Just curious--how many old Formasters are still in operation?
--Chuck
On 2/27/24 18:34, CAREY SCHUG via cctalk wrote:
> And the 1620 does addition and multiplication by table lookup.
That was only the CADET; the Model II had the math hardcoded. There was
an octal arithmetic option for the Model II, so it could do binary math
of a sort. Spent lots of fun hours
On 2/27/24 15:43, Wayne S via cctalk wrote:
> I know you do this for a living and are good at it. Most of us don’t do it as
> a living but have piles of floppies that we want to recover cheaply using an
> existing method. Grease, cat and other wezels, are fine but you have to do
> more work
On 2/27/24 14:50, CAREY SCHUG via cctalk wrote:
> but still only floppy speeds. maybe they have software mods for larger
> capacity, but
> still only floppy speeds. emulate the western digital chip and go as fast as
> the
> original machine can handle it.
There are inexpensive floppy
On 2/27/24 14:42, Wayne S via cctalk wrote:
> Take a look at the Applesauce.
> It hooks up to a lot of different floppy drives and records and decodes the
> flux.
> Version2 of the hardware is being sourced and should be available in a few
> months.
>
Good grief, there are more of these
On 2/27/24 14:09, Paul Koning via cctalk wrote:
> Suppose you had schematics of, say, a KA-10. You could turn those gates into
> VHDL or Verilog, and that should deliver an exact replica of the original
> machine, bug for bug compatible. That assumes the timing quirks are
> manageable, which
On 2/27/24 13:28, CAREY SCHUG wrote:
> you are correct. Packard Bell. apologies. And the picture on page 8 is (or
> is close to)
> the paper tape reader I remember. So many fun things to program (I
> programmed in octal only).
I like the description on that same page referring to "octal
On 2/27/24 10:10, ben via cctalk wrote:
> On 2024-02-27 9:20 a.m., CAREY SCHUG via cctalk wrote:
>> It's not a cassette, but the PB-440 (Pitney-Bowes), renamed Raytheon
>> 440 and its upgrade the raytheon 520 had a large reel paper tape with
>> a bidirectional read and an "operating system" Load
On 2/23/24 20:32, steve shumaker via cctalk wrote:
> Would you consider parting with it? I've actually got the 1052S up and
> working with the Depot4 software but I'm still looking for a 6250 unit.
>
Hi Steve,
I might consider a trade, but to be perfectly frank, I don't think you'd
like it.
At
I wonder if the XT2180 uses the same mech as the XT1140. That thing's
initial seek would wake the dead..
--Chuck
In my experience, the Qualstar drives aren't the best tool for the job.
They're basically a cost-minimized apparatus for handling tapes under
the most optimistic of conditions. In particular, they don't really
move the tape quickly enough at 6250 fci to get a decent read signal.
SCSI drives for
On 2/9/24 10:16, Gary Sparkes via cctalk wrote:
> Do we have anyone who can read these tapes? Maybe Al at CHM?
Any number of folks here should be able to read them. I certainly can,
but that's business for me, so not free.
--Chuck
On 2/7/24 22:59, Nico de Jong via cctalk wrote:
>
> Maybe you dont know, but all the Qualstars I've met, are basically
> Pertec. I've run some 1052's on Overland software.
>
I have a 1260S that's a SCSI interface. The 1052 was also available
with a SCSI interface. Basically a 1260 or 1052
On 1/31/24 13:03, Mike Katz via cctalk wrote:
> Michael,
>
> Thank you, that was what I was planning as my next step. I haven't
> checked to see if the service manual has a full schematic.
>
> The main purpose of my message on here was to see if I was missing
> something obvious like an option
On 1/31/24 11:12, Mike Katz via cctalk wrote:
> I have not yet tried installing terminating resistors...
That might help. It's also possible that the LED/phototransistor for
the SS index position is faulty. The two LEDs (SS and DS) are connected
in series, so you know that at least one isn't
On 1/23/24 02:13, ED SHARPE via cctalk wrote:
> FASTBACK bak up ptogrsm...Help how to recover files stored in this backup
> format,?
> Back when the museum was next to computer exchange Inc. Pre '94. We put out
> a journal once a year Over 100 pages tightly leaded would like to access
> files
On 12/30/23 22:26, Jim Brain via cctalk wrote:
> https://entertainment.slashdot.org/story/23/12/30/0151241/documentarians-secure-original-reboot-master-tapes-but-need-help-to-play-them
>
The Bosch unit may be very difficult to find. Will a Sony
DVR-1000/2000/2100 do the same job for those
On 12/22/23 16:02, Glen Slick via cctalk wrote:
> On Fri, Dec 22, 2023 at 2:13 PM r.stricklin via cctalk
> wrote:
>>
>> Did IBM ever publish programming information for their PC SDLC or BiSync
>> communications boards? I’m wondering about the possibility of programming
>> one to drive the
On 12/10/23 14:04, Liam Proven via cctalk wrote:
> Does anyone have any experience with the IBM BookManager format and the
> tools to read it?
>
Have you looked at http://kev009.com/wp/projects/boo2pdf/
--chuck
For your edification:
https://hackaday.io/project/193805-3d-print-babbages-difference-engine-no2
--Chuck
A little addition is that after the sale to C, most of the SMS
employees were shifted to Televideo who bought the SMS board business.
--Chuck
On 12/5/23 16:59, Shoppa, Tim via cctalk wrote:
> SMS was based in Mountain View starting in the 70's. They sold DEC-compatible
> Q-bus storage systems in the early 80's and transitioned into IBM PC disk
> storage ASICs and boards under the OMTI brand in the late 80s.
>
SMS declared bankruptcy
On 11/30/23 15:46, Van Snyder via cctalk wrote:
> I was given a 22-inch Viewsonic monitor. The label had been scratched
> off. It has four switchesd below the screen, labeled 1, 2, an up arrow,
> and a down arrow.
>
> When I plug it in, it flashes Red, Blue, Green, White at about one-
> second
On 11/22/23 19:08, ben via cctalk wrote:
> for the most common sequences being shorter. 8 bit bytes only give space
> for byte or word instructions, not both. Prefix bytes are good
> compromise with the segmented 64K memory space. Data and code space are
> optimized for 16 bits. You want 32 bits,
On 11/22/23 16:47, Fred Cisin via cctalk wrote:
> When the 5150 came out, the CP/M software companies, such as MicroPro
> (Wordstar) and Sourcim (Supercalc), were able to port their products to
> it much faster than anybody could port stuff to Macintosh.
Yup. I have vivid memories of the
On 11/22/23 15:06, Fred Cisin via cctalk wrote:
> Therefore, it could be argued that Win11 can be run on a "heavily
> modified modified 4004"
Certainly possible, if not incredibly silly.
--Chuck
On 11/21/23 18:18, Bob Rosenbloom via cctalk wrote:
> On 11/21/2023 4:08 PM, Fred Cisin via cctalk wrote:
ISTR a 4004 on one of the boards of my DTC300 Hytype I daisy wheel
printers.
(or has unrefreshed wetware dynamic RAM lost its content?)
>
The Diablo high-speed screaming-loud
On 11/14/23 16:12, steve shumaker via cctalk wrote:
> Greetings all.. I'm looking for a Qualstar 1260S 1/2" tape system to
> review/recover data from a stack of early Landsat tapes that I came into
> a while back. I'd prefer the Qualstar SCSI system for familiarity but
> basically I'm looking
On 10/13/23 10:07, Martin Bishop via cctalk wrote:
> Regulation is typically effected by a high voltage N-fet or similar device
> see e.g.
> - https://www.microchip.com/en-us/product/lnd150# etc etc
> - https://www.ti.com/lit/pdf/snva020 etc etc
What, no violet-glow voltage regulator tubes (e.g.
On 9/28/23 08:17, Robert Ollerton wrote:
> i'm looking for cables for this if anyone has one to spare or a lead
> where to find em.
>
What are you connecting to at the far end? The drive connections are
simple 2x50 pin IDC (ribbon) headers. I made my own--took me about 15
minutes. I used
I can recommend this drive. Very solid units and used on a lot of Sun
installations, which usually included the extra 256K buffer option.
Yes, it's heavy, particularly if you install it in an EIA rack--you
should have the heavy-duty mounting kit for it.
I picked mine up as a new unit--surplused
On 9/26/23 07:11, jim stephens via cctalk wrote:
> Overland data Pertec controllers, ISA, AT and PCI interfaces with
> utilities for the Pertec interface drives.
I also posted plans and software for a Pertec tape controller using an
MCU with U SB or serial for comms and control. Data is stored
On 9/25/23 18:37, steve shumaker via cctalk wrote:
> Do you know of a source for drivers and software for the PC environment
> for this equipment? I was recently given a 1054 which is supposedly the
> same system with a SCSI interface. I've yet to find anything online.
> Any suggestions would
Stupid question, I know, but someone has to ask it.
Is there some overwhelming reason that the FPGA and associated logic
couldn't be subsumed into an inexpensive 32-bit MCU running at, oh, 200
MHz? I can't believe that a PDP8 is all that fast...
--Chuck
On 9/22/23 11:34, emanuel stiebler via cctalk wrote:
> There are still some 84pin chips out there(Altera & Xilinx). Sometimes
> they are pulls, or some 5V tolerant xilinx xc95l
I still have a few 84 pin PLCC XC95108 5V CPLDs Originally, I did a
tape controller design with one before Xilinx
On 9/22/23 01:57, Peter Coghlan via cctalk wrote:
>
> It looks like a disk FST tweaked for writing to tape to me. Using the FST
> layout in LY24-5221-2 referenced by Dennis earlier, I think maybe it might
> be interpreted something like below. Apologies if I've mixed anything up
> here.
Thank
Thanks for the information so far, folks.
Now this boils down to interpreting the final CMS record for each file.
I'm not clear on how to interpret them, however. For example,
> Block 10, 87 bytes:
> 00 02 c3 d4 e2 d5 01 76 00 01 c1 f1 01 75 00 00 c6 |.CMSNA1F|
> 10 00 00 00
On 9/21/23 08:23, Dennis Boone via cctalk wrote:
> Starting on pdf page 135 here is a description of the FST data
> structures from circa 1986:
>
> https://bitsavers.org/pdf/ibm/370/VM_SP/Release_5_Dec86/LY24-5221-2_VM_SP_Release_5_Data_Areas_and_Control_Block_Logic_Volume_2_CMS_Dec1986.pdf
>
>
I slept on the problem a bit--good thing that I'm old; I like to
sleep--and think that I've got it sussed out.
Tape appears to consist of 4101 byte blocks, each with a "/02CMSx"
header; the first one seems to be "CMSF" with the intervening ones being
"CMSV" and then a final 87 byte block starting
On 9/20/23 20:33, Dennis Boone via cctalk wrote:
> > Ive got a tape here from what I believe to be a VM system. The
> > structure is unknown to me, although I can possibly take a stab at
> > it. Lots of data between tapemarks that seems to consist of a number
> > of records that start out
Group,
Ive got a tape here from what I believe to be a VM system. The
structure is unknown to me, although I can possibly take a stab at it.
Lots of data between tapemarks that seems to consist of a number of
records that start out something like this (translated from EBCIDC):
> 02 43
On 9/10/23 13:31, Fred Cisin via cctalk wrote:
> On Sun, 10 Sep 2023, Chuck Guzis via cctalk wrote:
>> Can't say, but probably. I've got an 8" disk here written by an Apple
>> II. Encoding is weird--basically the Apple RWTS encoded as 8 bit FM
>> (3740) bytes. Haven't b
On 9/10/23 13:00, Fred Cisin via cctalk wrote:
> On Sun, 10 Sep 2023, Chuck Guzis via cctalk wrote:
>> Now, let's talk about 2.8" and 3.25" drives; UK readers are certainly
>> familiar with 3.0 inch CF drives used on Amstrads.
>
> Amdek? sold a dual 3" drive
On 9/10/23 12:39, Fred Cisin via cctalk wrote:
> On Sun, 10 Sep 2023, Chuck Guzis via cctalk wrote:
>> There are 40 track derivatives; used for word processing, particularly
>> on some Brother models. No big deal; when reading those, one simply
>> double-steps a "n
On 9/10/23 09:44, Liam Proven via cctalk wrote:
> No idea of the CPU performance. 4MHz Z80A but whether there was any
> contention or anything I have no idea. I believe one of the
> interesting bits of the design is that there's no ROM at all. They
> came with a dedicated printer (as well as a
On 9/10/23 07:35, Joshua Rice via cctalk wrote:
> What confused me, is that i believe the 3.5" Sony Microfloppy originally
> had 70 tracks. I'm personally completely oblivious to any 40-track 3.5"
> microfloppy formats.
>
> I have a pair of Sony OA-D30V drives, which i believe were the first
>
On 9/8/23 15:20, Fred Cisin via cctalk wrote:
pretty well and BIOS/ancient OSes not at all!
>
> It would still be handy to have a USB device that operates as a "normal"
> fully functional FDC.
> It would make it possible to add floppies to devices without them,
> and/or add more or different
On 9/8/23 15:00, Anders Nelson via cctalk wrote:
> Hi Chuck,
>
> The drive is a Qume Qumetrak 242 so I assume soft sector? I'm open to
> correction.
>
Mostly. Most drives can, with the proper logic be made to read and
write hard-sector disks. You just don't get separate SECTOR/ and INDEX/
On 9/8/23 12:58, Anders Nelson via cctalk wrote:
> Hi all,
>
> I just bought a very clean, DSDD 8" disk drive off eBay and it has a 50p
> connector which I guess is the common Shugart type? I also found a 50p->
> 34p adaptor PCB design someone documented online.
>
> I haven't delved much into
On 9/3/23 13:28, Paul Koning via cctalk wrote:
> I like OSHPark, US based and pretty quick, decent pricing. Low enough I
> haven't felt compelled to look for cheaper alternatives. One nice feature is
> that they take KiCAD board files directly, no need to generate the low level
> Gerber
With all this talk about Friden and Singer, perhaps someone can help me
jog my memory. We were working on a contract that, as remote terminals,
included a card reader (singer) and a printing terminal (singer also).
The terminal consisted of a leadscrew-fed printing head with a vertical
typewheel
On 9/1/23 11:58, Christian Kennedy via cctalk wrote:
> At one point in the late 1970's, some division of Ball ended up buying
> the firm that did contract maintenance on our Novas and 16 bit
> Eclipses. After the purchase the quality of the work took a nosedive,
> which led to one of my
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