On 03/02/2018 06:44 AM, Maciej W. Rozycki via cctalk wrote:
> On Wed, 28 Feb 2018, Paul Koning via cctalk wrote:
>
>> With the VAX, this got cleaned up to a significant extent, and ditto
>> with Alpha. In both cases, an internal validator tool was created to
>> verify that, at least from the poi
On Wed, 28 Feb 2018, Paul Koning via cctalk wrote:
> With the VAX, this got cleaned up to a significant extent, and ditto
> with Alpha. In both cases, an internal validator tool was created to
> verify that, at least from the point of view of instruction execution, a
> new machine worked the s
From: Doug Ingraham
Sent: Wednesday, February 28, 2018 9:53 AM
> This is a great story! And it probably indicates that when developing the
> Toad-1 this particular diagnostic was never run from an original DEC generated
> tape or the Toad-1 would have failed the diagnostic. Alternatively assembl
On 02/28/2018 10:55 AM, Paul Koning via cctalk wrote:
> In general, manuals are only a rough approximation of reality. I
> remember an old joke that "PDP-11/x is compatible with PDP-11/y if
> and only if x == y". And sure enough, if you look at the models
> appendix of the PDP-11 Architecture Ha
> On Feb 28, 2018, at 1:10 PM, David Bridgham via cctalk
> wrote:
>
>
>> Imagine our chagrin when days of trying to correct the
>> problem led to the conclusion that the diagnostic was incorrect.
>
> I may have a situation like this in working on my FPGA PDP-10. The
> Processor Reference Ma
> Imagine our chagrin when days of trying to correct the
> problem led to the conclusion that the diagnostic was incorrect.
I may have a situation like this in working on my FPGA PDP-10. The
Processor Reference Manuals seem quite clear that the rotate
instructions take E mod 256. One of the man
On Tue, Feb 27, 2018 at 2:46 PM, Rich Alderson via cctalk <
cctalk@classiccmp.org> wrote:
>
> Fast forward 20 years, to Living Computer Museum, where a KI-10 based
> DEC-1070
> was undergoing restoration. Diagnostics were needed, so the resident
> TOPS-20
> programmer laid hands on the MAINDEC sou
From: Paul Koning
Sent: Monday, February 26, 2018 12:19 PM
>> On Feb 26, 2018, at 12:06 PM, Doug Ingraham via cctalk
>> > wrote:
>> The purpose of an emulator is to accurately pretend to be the original
>> hardware. It doesn't matter that the original OS runs on a particular
>> emulator. If a p
The purpose of an emulator is to accurately pretend to be the original
hardware. It doesn't matter that the original OS runs on a particular
emulator. If a program can be written that runs on the original hardware
but fails on the emulator then there is a flaw in that emulator.
On Mon, 26 Feb
On Mon, Feb 26, 2018 at 12:19 PM, Paul Koning via cctalk
wrote:
>
> Another example is the work pdp2011 had to do in order to make RSTS boot on
> that FPGA based PDP-11 emulation, because RSTS was doing some CPU-specific
> hackery to test for an obscure CPU (or FPU?) bug that had been corrected
> On Feb 26, 2018, at 12:06 PM, Doug Ingraham via cctalk
> wrote:
>
> The purpose of an emulator is to accurately pretend to be the original
> hardware. It doesn't matter that the original OS runs on a particular
> emulator. If a program can be written that runs on the original hardware
> bu
On Fri, Feb 23, 2018 at 2:49 PM, Rick Murphy via cctalk <
cctalk@classiccmp.org> wrote:
> On 2/21/2018 5:14 PM, Paul Koning via cctalk wrote:
>
>> Ok, then it could be for VMS, which also does this (via Andy's
>> unsupported driver). I don't know of PDP-11 or other minicomputer systems
>> that do
On 2/21/2018 5:14 PM, Paul Koning via cctalk wrote:
Ok, then it could be for VMS, which also does this (via Andy's unsupported
driver). I don't know of PDP-11 or other minicomputer systems that do DECtape
overlapped seek. I suppose it could be for artistic verisimilitude...
TSS/8. It was a
Rich Alderson wrote:
> It's not for Tops-10. SimH only provides the KS-10 processor[1], so
> DECtape is not a possible peripheral.
> [1] Although there is a KA-10 in the works.
Also KI-10 in its current state. Maybe PDP-6 in the future.
> On Feb 21, 2018, at 3:25 PM, Rich Alderson via cctalk
> wrote:
>
> From: Paul Koning
> Sent: Wednesday, February 21, 2018 6:41 AM
>
>> And while there is roughly-accurate simulation of DECtape in SIMH (presumably
>> for TOPS-10 overlapped seek to work?)
>
> It's not for Tops-10. SimH only
From: Paul Koning
Sent: Wednesday, February 21, 2018 6:41 AM
> And while there is roughly-accurate simulation of DECtape in SIMH (presumably
> for TOPS-10 overlapped seek to work?)
It's not for Tops-10. SimH only provides the KS-10 processor[1], so DECtape is
not a possible peripheral.
16 matches
Mail list logo