A great showcase for graphics support using VNC could be Terak
(http://en.wikipedia.org/wiki/Terak_8510/a) that had a smart frame
buffer with downloadable fonts, hardware-assisted scrolling, and
text/graphics overlay.
Leo
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What would be the prerequisites for adding a BESM-6 simulator (namely,
http://sourceforge.net/projects/besm6/) to the official SIMH distribution,
to the beta kit, or for linking to it from the SIMH web page?
Thanks,
Leo
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In this case the value is calculated from the other bits:
parity({upper half-word, parity bit 1}) = 0, parity({lower half-word,
parity bit 2}) = 1 indicates an instruction word
parity({upper half-word, parity bit 1}) = 1, parity({lower half-word,
parity bit 2}) = 0 indicates a data word
Leo
On
Dear colleagues,
There is an implementation detail in the BESM-6 architecture the name of
which we've struggled to translate adequately. There is a feature
preventing execution of arbitrary data as instructions implemented using
two parity bits per word, for the upper and the lower half-word.
On Thu, 16 Jul 2015 07:53:44 -0700, Alan Frisbie
fris...@flying-disk.com wrote:
On 07/16/2015 05:40 AM, Hans-Ulrich Hölscher wrote:
if you want to image your disks and floppies for use with simh,
there's an easy way to do it. All you need is a (Micro-)VAX
having the appropriate
On Fri, 17 Jul 2015 11:18:34 +0200, Hans-Ulrich Hölscher
hoelscher-kirchb...@freenet.de wrote:
That sounds like the really easy way to do it. Does it copy track 0 of
RX01/02 floppies? I had some experience with RX01/02 floppies when
reviving LSX using logical copies of the disks. Track 0
As a first step, you can try using https://gmplib.org/
Leo
On Sat, 11 Jun 2016 00:46:02 +0100, "Dave Wade"
wrote:
> Whilst its not a SIMH simulator, I hope you can help. I want to write an
> emulator for the Pegasus. The Ferranti Pegasus was (there are none
> operating
/*modti3*.c
Leo
On Fri, Jun 10, 2016 at 5:22 PM, Leo Broukhis <l...@mailcom.com> wrote:
> As a first step, you can try using https://gmplib.org/
>
> Leo
>
>
> On Sat, 11 Jun 2016 00:46:02 +0100, "Dave Wade" <dave.g4...@gmail.com>
> wrote:
>
>
>>
In the very first BESM-6 FORTRAN compiler -- the one derived from the CDC
1604 FORTRAN compiler by manually retargeting the assembly language source
-- there is a peculiar bug: the line
IF (X=Y) stmt
which should be rejected as syntactically incorrect (and is rejected by
another, independently
I wonder what is the historically first programming environment with native
binary floating point which had been proved/demonstrated to handle f.p.
binary<->decimal I/O conversions 100% correctly?
By 100% correctly I mean that all valid binary representations of floating
point numbers could be,
On Mon, 17 Oct 2016 15:29:10 -0600, Kevin Handy
wrote:
How close are the simh emulators to the real hardware's floating point? How
> exct is the emulation of FPU's?
> Does simh emulate the real hardware close enough that you can use it to
> analyze the original hardware
016 at 8:55 AM, Paul Koning <paulkon...@comcast.net> wrote:
>
> On Oct 14, 2016, at 7:22 PM, Leo Broukhis <l...@mailcom.com> wrote:
>
> I wonder what is the historically first programming environment with
> native binary floating point which had been proved/demonstrated t
Cool! I've been avoiding implementing the tape driver for BESM-6 because it
had formatted tapes and in-place overwrite of individual records. I'll be
able to do it soon, then!
Thanks,
Leo
On Mon, 24 Oct 2016 12:24:25 -0400, Bob Supnik wrote:
> Mark,
>
> Dave Bryan and I are
Thank you, Nelson!
It appears that, indeed, apart from theoretical research, there was not
much actual work attempting to perfect the accuracy of the conversions
until the 1990s.
Then I don't have to feel ashamed on behalf of the Soviet applied
mathematicians that they didn't do a job good
ormals or not), it appears that the Electrologica floating point turned
out to be impractical.
On Mon, Oct 17, 2016 at 11:35 AM, Paul Koning <paulkon...@comcast.net>
wrote:
>
> > On Oct 17, 2016, at 2:26 PM, Leo Broukhis <l...@mailcom.com> wrote:
> >
> > > I
Please visit https://scan.coverity.com/projects/simh
If you have a GitHub account and have contributed a commit, you can add
yourself to the project to view the defects after logging in with your
GitHub ID.
Leo
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I think that the proper image size should be 256256, as 6656 is exactly
256x26, w which is a multiple of 13, as well as 256256.
On floppy disks with 77 tracks of 26 128-byte sectors each, or 13 256-byte
sectors, track 0 could be treated as the last one when the media was
accessed at the
While exploring implementations of Pascal on BESM-6, I've encountered two
peculiar language extensions about which I've asked on SE:
BRANCH/BACK: an analog of try/catch:
https://retrocomputing.stackexchange.com/q/3150/4025
Structural labels as a way to implement generalized break/continue:
On Aug 26, 2017 15:30, "Adam Sampson" <a...@offog.org> wrote:
Leo Broukhis <l...@mailcom.com> writes:
> I'm specifically interested in the branch/back feature. What
> theoretical paper does it come from?
I think it's fairly likely that the designers of your 1979 dia
, Nov 3, 2017 at 1:42 PM, Leo Broukhis <l...@mailcom.com> wrote:
> Well, somebody had to have done it!
>
>
> On Fri, Nov 3, 2017 at 1:22 PM, Larry Stewart <l.s...@stewart.org> wrote:
>
>> I took the liberty of cross posting this earlier to TUHS and I got
>&g
https://retrocomputing.stackexchange.com/q/4965/4025
In the UNIX V7 version of the C language, there were the /\ (min) and the
\/ (max) operators. In the source of the scanner part of the compiler,
case BSLASH:
if (subseq('/', 0, 1))
return(MAX);
goto unkn;
case DIVIDE:
if
Will,
Please don't hesitate to ask on the TUHS mailing list.
Thanks,
Leo
On Fri, Nov 3, 2017 at 2:56 AM, Will Senn <will.s...@gmail.com> wrote:
> On 11/3/17 12:14 AM, Leo Broukhis wrote:
>
> https://retrocomputing.stackexchange.com/q/4965/4025
>
>
> In the UNIX V7 v
:42 -0700
> Leo Broukhis <l...@mailcom.com> wrote:
>
> > https://retrocomputing.stackexchange.com/q/4965/4025
> >
> >
> > In the UNIX V7 version of the C language, there were the /\ (min) and
> > the \/ (max) operators.
>
> As an aside, many will kn
tew...@serissa.com>
> wrote:
>
> This caught my attention. Did early C really have min and max? Were they
> used for anything? In those days I was a BCPL user, which IIRC, did not
> have such things.
>
> -Larry
>
> Begin forwarded message:
>
> From: Leo Brouk
It would have been nice of you, Dave Porter, to include a link to the
source of inspiration for your question:
https://retrocomputing.stackexchange.com/q/7056/4025
Leo
On Wed, Aug 1, 2018 at 5:26 PM, dave porter
wrote:
> Not really a simh question, but this might be an appropriate
> bunch of
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