On Sun, 14 Mar 2021, Liam Proven via cctalk wrote:
> > I should also note, that the other way to get back to real mode from
> > protected mode is via a triple-fault. What gets me (and I railed on
> > Intel when I worked there for a time) that it still existing in the
> > architecture even though
On 3/14/21 11:36 AM, Guy Sotomayor via cctalk wrote:
>
> I can say with a fair amount of certainty, that we at IBM knew of the
> existence of the LOADALL instructions including all of it's warts (and
> its inability to switch back from protected mode) from the earliest days.
>
ca. 1980, we
I'd be interested in the guides if you're located in Germany, and I do have
access to a book scanner.
Best,
MalteOn Mar 14, 2021 19:08, David Brownlee via cctalk wrote: > > I have
acquired a tiny slice of Orange Wall, and wondered if anyone would > be
interested - preference for anyone who is
In contrast, Apple chose to abandon compatability with all previously
existing software
On Sun, 14 Mar 2021, Al Kossow via cctalk wrote:
When they stopped selling Apple II's when Lisa was released.
Yes, exactly.
I was referring to the switch to 68000 (Lisa and then Mac), rather than
trying
On 3/14/21 1:42 PM, Fred Cisin via cctalk wrote:
In contrast, Apple chose to abandon compatability with all previously existing
software
When they stopped selling Apple II's when Lisa was released.
On Sun, 14 Mar 2021, Guy Sotomayor via cctalk wrote:
There were many heated discussions in various task forces (this was of course
IBM) about the next generation OS (to become OS/2) about the '286.?? First
and foremost was how to be able to run DOS programs on the '286. Over very
vocal
I would be interested in EK-NETAA-UG-001 VAXstation 2000, MicroVAX 2000 and
VAXmate Network Guide and the EK-VAXAB-IN-002 VAXstation 2000 Hardware
Installation Guide would be nice if you get no takers. You don't say where you
are located. I suspect shipping from the USA to the UK would be too
On 3/13/2021 3:30 PM, Chuck Guzis via cctalk wrote:
I strongly suspect that this is the same fellow who published a paper on
the ECP-18. You might drop him an email:
https://www.linkedin.com/in/allen-fulmer-a4bb5b29
Forget DDG--I use google with an anti-tracking plugin.
--Chuck
I can see
On Sun, 14 Mar 2021 at 19:37, Guy Sotomayor via cctalk
wrote:
> There were many heated discussions in various task forces (this was of
> course IBM) about the next generation OS (to become OS/2) about the
> '286. First and foremost was how to be able to run DOS programs on the
> '286. Over very
On 3/14/21 11:09 AM, Peter Corlett via cctalk wrote:
On Sun, Mar 14, 2021 at 04:32:20PM +0100, Maciej W. Rozycki via cctalk wrote:
On Sun, 7 Mar 2021, Noel Chiappa via cctalk wrote:
The 286 can exit protected mode with the LOADALL instruction.
[...]
The existence of LOADALL (used for
On Sun, Mar 14, 2021 at 04:32:20PM +0100, Maciej W. Rozycki via cctalk wrote:
> On Sun, 7 Mar 2021, Noel Chiappa via cctalk wrote:
>>> The 286 can exit protected mode with the LOADALL instruction.
[...]
> The existence of LOADALL (used for in-circuit emulation, a predecessor
> technique to modern
I have acquired a tiny slice of Orange Wall, and wondered if anyone would
be interested - preference for anyone who is setup to scan and upload the
missing bits to bitsavers or similar :)
These seem to already be generally available online
EK-NETAB-UG-002 Workstations and MicroVAX 2000 Network
I should update people on this as I have made progress today. I found two
broken tracks from the 8742 peripheral controller to the ASICs. One of the
ASICs sends a RESET to the 286. When I repaired that track suddenly the
protected mode test started to pass. Now I have other errors which are
almost
On Sun, 7 Mar 2021, Noel Chiappa via cctalk wrote:
> > The 286 can exit protected mode with the LOADALL instruction.
>
> Really? So why all the hullabaloo about Triple Faults:
>
> http://www.rcollins.org/Productivity/TripleFault.html
>
> back in the day; and why did IBM set up the
> On Mar 13, 2021, at 1:34 PM, Joshua Rice via cctalk
> wrote:
>
>
>> Very interesting looking. I can't quite make out what is going on in that
>> rectangular area where all the wires terminate, labeled 0-15 and A-R. Are
>> there diodes there? Anything on the other side of that board?
>
> > The question arises: "Is this something that seriously interests
> > you
> > and you're willing dedicate some real effort to? Or is this just
> > a
> > slow Saturday question?"
> >
> > I'm sure that Fred could tell you about doing serious research.
>
> I suspect that means spending
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