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
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
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
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
> 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
> 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
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