now, there is a 11/23 I could love! ---Ed#
In a message dated 6/22/2016 9:44:20 P.M. US Mountain Standard Time,
glen.sl...@gmail.com writes:
BACKPLANE",
> so the operation is not so mysterious. I had never seen a hex-wide Q-bus
> backplane before this.
>
> There are some pictures of the s
On 23/06/2016 2:38 AM, Brian Walenz wrote:
On Wed, Jun 22, 2016 at 12:01 PM, Noel Chiappa
wrote:
Werner Buchholz (editor), "Planning a Computer System: Project Stretch",
McGraw-Hill, New York, 1962
http://ed-thelen.org/comp-hist/IBM-7030-Planning-McJones.pdf
Speaking of books
> On Jun 22, 2016, at 11:05 PM, Swift Griggs wrote:
>
> ...
> Just some internet bungholes on reddit. Brother, just remember, *you*
> asked, and you can never get the time back:
>
> https://www.reddit.com/r/programming/comments/d92jj/why_computers_use_twos_complement_to_represent/
Nice.
I ha
On 2016-06-23 3:20 AM, Lionel Johnson wrote:
...
I joined CDC in Melbourne, Aust in 1972, worked mostly on 3200 machines
- Didn't like the Cybers, but admired the horsepower. I could fix a
3200, every time, that was the best training I ever had, alone with my
machine in Hobart, I loved it. When t
On Thu, Jun 23, 2016 at 4:31 PM, Paul Koning wrote:
>
> Another interesting aspect where people may not be aware of how much
> variety existed is in the encoding of floating point numbers. IEEE
> is now the standard, but PDP-11 users will remember the DEC format
> which is a bit different. CDC a
On 06/23/2016 07:31 AM, Paul Koning wrote:
> I have a copy of 1948 (!) lecture notes on computer design. It
> discusses one's complement and two's complement. It points out the
> advantage of two's complement (no two zeroes) but also the
> disadvantage that negating is harder (requiring two step
> On Jun 23, 2016, at 10:50 AM, Camiel Vanderhoeven wrote:
>
> ...
> There are many, many varieties of floating point formats. This page
> gives a nice overview: http://www.quadibloc.com/comp/cp0201.htm
Nice. The CDC 6000 description isn't quite right (or not clear) because a
negative float i
On 6/23/16 8:17 AM, Chuck Guzis wrote:
> On 06/23/2016 07:31 AM, Paul Koning wrote:
>
>> I have a copy of 1948 (!) lecture notes on computer design. It
>> discusses one's complement and two's complement. It points out the
>> advantage of two's complement (no two zeroes) but also the
>> disadva
> On Jun 23, 2016, at 11:17 AM, Chuck Guzis wrote:
>
> ...
> Of course, there were also machines that used the floating point
> facility for all arithmetic. Integer computations is performed as a
> subset of floating-point. This has the ramification that an integer
> does not occupy an entire
> On Jun 23, 2016, at 12:07 PM, Al Kossow wrote:
> ...
> I have also heard that 2s compliment was popular in shorter word length
> machines because 1s compliment multiple precision arithmetic is a PITA
> to implement.
That's true. It certainly can be done and has been. But since one's complemen
> On Jun 23, 2016, at 12:11 PM, Paul Koning wrote:
>
>
>> On Jun 23, 2016, at 12:07 PM, Al Kossow wrote:
>> ...
>> I have also heard that 2s compliment was popular in shorter word length
>> machines because 1s compliment multiple precision arithmetic is a PITA
>> to implement.
>
> That's true
On 06/23/2016 09:09 AM, Paul Koning wrote:
> The CDC 6000 did that in part. It has full 60 bit integer
> add/subtract, but multiply and divide are done using the floating
> point operations so they work only for numbers up to 47 bits.
The CYBER 200/STAR 100 limited integers to 48 (of 64) or 24 (
I have been going through our library of documentation and found some items
that are duplicates.
There are a LINC-8 programming manual, PDP-8 DecTape programming manual,
PDP-8/L maintenance manual, PDP-8/e maintenance manual volume I and volume
III.
http://i.imgur.com/YEAdnZV.jpg?1
http://i.imgur
Paul Koning writes:
> in the Electrologica machines (Dutch computers from the late 1950s to
> mid 1960s), double-length values are encoded with the sign bit
> replicated in each word.
The PDP-10 double integer format also duplicates the sign bit, but is
two's complement.
> On Jan 3, 2016, at 4:56 PM, Paul Koning wrote:
>
> ...
> This Forth implementation is a port of Fig-FORTH by John S. James, with some
> RSTS-specific magic added. I just realized the file header says that it is
> in the public domain, so I suppose I should post the source...
Done. Thanks
From: Swift Griggs
Sent: Wednesday, June 22, 2016 6:46 PM
>On Wed, 22 Jun 2016, Rich Alderson wrote:
>> We have [a DD60] running at LCM, attached to an instance of dtCyber, the
>> 6000/Cyber simulator, via John Zabolitzky's Xilinx-based display adapter.
>> We're in the process of refurbing the on
Hmm, I'm thinking hard of what I should bring on saturday that might
interrest you. This is right up my alley.
You already have one of each of what I own :D
/P
On Thu, Jun 23, 2016 at 07:20:13PM +0200, Mattis Lind wrote:
> I have been going through our library of documentation and found some it
Hey guys,
I was looking and found that the Tektronix 4010 is a calligraphic display,
for which I found a video!
https://www.youtube.com/watch?v=IztxeoHhoyM
Let me know if it bares a resemblance to the display on the 6600
On Wed, Jun 22, 2016 at 10:32 AM, Swift Griggs
wrote:
> On Tue, 21 Jun 20
On 06/23/2016 10:28 PM, James Vess wrote:
Hey guys,
I was looking and found that the Tektronix 4010 is a calligraphic display,
for which I found a video!
https://www.youtube.com/watch?v=IztxeoHhoyM
Let me know if it bares a resemblance to the display on the 6600
It wasn't normally used in tha
Someday I want to have a PDP11 even if it is a QBUS version
I can get a clean RX02 for about $150. When my life involved PDP11's
starting with 34A and ending with 44's I never used one.
-pete
On Thu, Jun 23, 2016 at 1:17 PM, Pete Lancashire
wrote:
> Someday I want to have a PDP11 even if it is a QBUS version
>
> I can get a clean RX02 for about $150. When my life involved PDP11's
> starting with 34A and ending with 44's I never used one.
They are useful on low-end systems, like an RT-
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