Paul Koning 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
The mapping from asynchronous pulses,
CAREY SCHUG wrote:
> What I wish somebody would create is an S-100 card (probably with a
> raspberry pie daughter running simulation for future upgradeability)
> that, initially emulates a complete Byte-8 or Imsai computer including
> memory and disk images on sdc cards, 24x40 display on an HDMI
our 1620 model 2 still did multiplication by table lookup.
--Carey
> On 02/27/2024 9:53 PM CST Chuck Guzis via cctalk
> wrote:
>
>
> 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
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 20:34, CAREY SCHUG via cctalk wrote:
Again, even if somebody offered me a complete IBM model 30 with disk and
tape drives, I could not afford the shipping. would
A 360/30 could be a real problem. It used air bags to push
the microcode cards against the bit line boards. Those air
I'd say the real cost is the second or third system to get spare parts.
that is why I want to replace the WD chip. the microprocessor talks to it
at bus speed. the os knows it has to wait, though some waits are for the
wd chip to say it is done. a SIMPLE mod to the legacy OS can eliminate
On 2024-02-27 3:09 p.m., Paul Koning via cctalk wrote:
On Feb 27, 2024, at 4:49 PM, CAREY SCHUG via cctalk
wrote:
Religion warning: I was a mainframer. Since at any practical budget, they can
only be emulated,
Dumpster diving is a 0 dollar budget.
People could afford the APPLE II,
> On Feb 27, 2024, at 5:22 PM, CAREY SCHUG via cctalk
> wrote:
>
> OK, probably the hardest part is the floppy disk, as the mechanics corrode
> over time
> more than chips.
>
> People have built electronics to connect to a floppy cable and emulate a drive
> electronically. Difficult to
CORRECTION:
GCR was used on Apple2, 400K/800K Mac, Commodore, Sirius/Vector, etc.
That should read Victor 9000, NOT Vector [Graphics]
Vector Graphics was hard sectored, and not GCR.
Northstar is probably the best known of the hard sector formats.
On Tue, 27 Feb 2024, CAREY SCHUG via cctalk wrote:
did not know about gcr/mfm on same floppy...if you respond, please mention who
does that. gaak, I don't even
recognize "gcr" at this point. I remember mfm and something else. mfm was
single density, right? was gcr
double density? does not
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
Vector uses gcr. Apparently.
I’m not well versed in any of this, just relaying stuff i read from the
Applesauce discord support channel. People ask questions like all of yours
there all the time.
Join it and scroll back on that channel. Lotsa interesting stuff.
Sent from my iPhone
> On Feb
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 to get usable stuff, unless your floppies are all c64
I knew most of this, which is why emulating the floppy controller should be
easier.
applesauce is platform specific (ok, ANY floppy emulation will be platform
specific for apple)
I thought the applesauce page said it was not yet available for standard
shugart style as in trs-80, s-100...
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
I have some 8-bit ISA 53c90a based SCSI controllers labeled "SCSI HB A8".
Mine are made by "Advanced Information Concepts", but apparently they were
also made by "Control Concepts". Unfortunately, mine don't have the BIOS
chips installed. I have a picture of the card with a chip installed
labeled
The “support” channel has the most info on the applesause.
Sent from my iPhone
On Feb 27, 2024, at 15:12, Wayne S wrote:
Chuck, not to disagree much, because you are an expert, but there’s more to
decoding floppies than just reading them. Some floppies have tracks that are
recorded at
Chuck, not to disagree much, because you are an expert, but there’s more to
decoding floppies than just reading them. Some floppies have tracks that are
recorded at different speeds. Some have tracks that use different modulation
gcr on some and mfm on others. A lot of floppies have different
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
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 were non-apple disk emulators (including one designed for automatic loom
weavers or
> On 02/27/2024 12:29 PM CST paul.kimpel--- via cctalk
> wrote:
> Bitsavers has a collection of G-15 manuals.
Rob Kolstad (formerly of BSDI) and I sat down last August to categorize
his online scans. AFAICT he has the largest collection. (Of course
I forgot to bring my copy of the technical
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
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.
Sent from my iPhone
> On Feb 27, 2024, at 14:32, Martin Bishop via cctalk
> wrote:
>
>
>>
> On 02/27/2024 9:05 AM CST Jon Elson via cctalk wrote:
>
> I think the Bendix G-15 had cassettes for the 5-level tape
> they used.
I can confirm this from personal experience.
mcl
>> I would love to see a PDP-8 with 1/2 size flip chips using today's smaller
>> logic.
Can you get the logic ? Especially the bus / backplane driving parts.
https://retrocmp.com/projects/qbone/326-qbone-unibone-alternative-bus-drivers
Q-bus transceivers (DS8641 being a classic) are
OK, probably the hardest part is the floppy disk, as the mechanics corrode over
time
more than chips.
People have built electronics to connect to a floppy cable and emulate a drive
electronically. Difficult to catch the timing on flux changes and digitize.
More than I want to spend at this
> On Feb 27, 2024, at 4:49 PM, CAREY SCHUG via cctalk
> wrote:
>
> Religion warning: I was a mainframer. Since at any practical budget, they
> can only be emulated,
Depends on your definition of emulated. Is an FPGA version merely an
"emulation"? You might say yes if it's a
Religion warning: I was a mainframer. Since at any practical budget, they can
only be emulated, for
small computers, I would like pure hardware as much as possible, and what did
or could have existed (no fpga).
What I wish somebody would create is an S-100 card (probably with a raspberry
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 2024-02-27 1:13 p.m., Doug McIntyre via cctalk wrote:
On Tue, Feb 27, 2024 at 11:10:34AM -0700, ben via cctalk wrote:
PS: With low cost Chinese PCB's and vintage parts, why are people not
building real hardware replica's of interesting machines.
But they are..
I can't tell what you'd find
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).
conditional instructions were "skip if", so if the first microinstruction in
the word, applied to the
On Tue, Feb 27, 2024 at 11:10:34AM -0700, ben via cctalk wrote:
> PS: With low cost Chinese PCB's and vintage parts, why are people not
> building real hardware replica's of interesting machines.
But they are..
I can't tell what you'd find interesting since the list is pretty wide.
I've got an
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
erik＠baigar.de wrote:
>
> > think the Bendix G-15 had cassettes for the 5-level
> > tape
> > they used.
> Aha, interesting! Did a short search, but have not been able to
> find a picture of a casette. Just a pile of paper tape instead ;-)
>
> https://images.app.goo.gl/HYqkpYHJUxZeGfiA8
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 the os, say we want to run fortran, spin down
On 2/27/24 08:58, erik--- via cctalk wrote:
Hi Jon!
think the Bendix G-15 had cassettes for the 5-level tape
they used.
Aha, interesting! Did a short search, but have not been able to
find a picture of a casette. Just a pile of paper tape instead ;-)
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 the os, say we want to run fortran, spin
down to fortran, read the program in on 80 column cards
Get a sheet of glass.
In a not too dusty area (hint A/C has filers usually)
gloves on
Top off glass on - all will be revealed.
Rod - Digital Equipment Corporation 1975 - 1985
On 27/02/2024 03:50, Chris Zach via cctalk wrote:
Oh wait, that sound? Over and over?
I had a RD54 type drive
Hi Jon!
> think the Bendix G-15 had cassettes for the 5-level tape
> they used.
Aha, interesting! Did a short search, but have not been able to
find a picture of a casette. Just a pile of paper tape instead ;-)
https://images.app.goo.gl/HYqkpYHJUxZeGfiA8
> of mylar tape instead of paper.
On 2/27/24 00:17, Dr. Erik Baigar via cctalk wrote:
I wonder whether anyone kows if someone else had the idea
of putting paper/mylar tape into a casette for repeated use
e.g. to load an OS or similar.
I think the Bendix G-15 had cassettes for the 5-level tape
they used.
I had an optical
> On Feb 27, 2024, at 1:17 AM, Dr. Erik Baigar via cctalk
> wrote:
>
>
> Hi there - recently I posted a small video on a rugged
> paper tape casette...
>
> https://www.youtube.com/watch?v=O2jnThYsPKc
>
> I wonder whether anyone kows if someone else had the idea
> of putting paper/mylar
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