Talk:LEO (computer)

message: Are you sure about 1500ms this is 1.5 seconds oughtn't this to be at least micro seconds? Rjstott
:I just thought of the same; 1.5 sec seems a little strange to me too.  I tried to find some info on the net, but failed, so I'll check with the LEO society.  I certainly wonder where the info in this article came from.  --Wernher 18:03, 5 Dec 2003 (UTC)
thread_title: Main memory cycle time

message: The sentence "The first LEO III was completed in 1961." in section 3 seems erroneous to me. Shouldn't that be LEO II, as the LEO III was built after the takeover by English Electric a few years later (according to the information in the same paragraph)?
M. Schouppe
—Preceding unsigned comment added by 82.93.197.50 (talk) 10:30, 28 September 2006
The first LEO III was installed in 1962. --Aspro 19:04, 31 August 2007 (UTC)
replies: text: Hi Reg, you can sign using --~~~~. That will automatically insert --, your Wikiname (or IP address if you are not logged in), date and time. There is also a button for that in the editor, just to the right of the Bold and Italics buttons; it looks like a pencil signing a signature. --Jhertel (talk) 20:17, 3 February 2015 (UTC)
thread_title:  LEO III or LEO II 

message: Some operators managed to get the computer to play tunes. Listen to example here:  But I am not sure that this is strictly encyclopaedic.--Aspro 19:04, 31 August 2007 (UTC)
thread_title:  Re: The LEO speakers 

message: Not borne out by the text. Surely more likely designed by Hartree, Wilkes and Pinkerton, project proposed and managed by Standingford and Thompson?Moletrouser (talk) 10:17, 24 August 2010 (UTC)
replies: text: Yes, I think you are right. According to Hally, LEO I was modelled closely on EDSAC, which was designed by Hartree and Wilkes, and the construction was managed by Pinkerton who reported to Thompson. Standingford and Thompson obviously had a key role in initiating the construction of LEO I, but probably had little involvement in its technical design. I have changed "designed" to "overseen" in the lead. Gandalf61 (talk) 11:58, 24 August 2010 (UTC)
thread_title:  Designed by Oliver Standingford and Raymond Thompson? 

message: I was one of the programmers on the Freemans (SW9) LEO 326 in the 1960s, I pass on some comments for you.
The LEO 326 had a 48 bit word 4 bits of which stored the program identity and controlled multi-programming the rest of the word was divided into two half words each with a sign bit and parity bit. Effectively one was working with two 20 bit half words or one 40 bit word.
It had two primary registers the A and B together with a radix register C which allowed it to do arithmetic in Pounds shillings and pence, Pounds and ounces, Feet and inches etc.
CLEO programs were prepared using 10 forms, somewhat analogous to the DIVISIONS of COBOL. I cannot remember them all but 5 was data and 10 was certainly the procedural code.
Programs were identified by a five digit number.
Only the first four characters of a data name were used by the compiler, which did not check uniqueness. Data fields could be alphanumeric (6 bit characters), hexadecimal (4 bit), Long or short integers (long binary integers were a full word and short a half word). One could also specify that a data item was monetary (in those days pounds shillings and pence).
CLEO programs were converted into INTERCODE which was then assembled into machine code. In practice INTERCODE was virtually machine code and used the machine code command set with data names rather than addresses.
The Freemans machine of the mid 1960s had 5 x 4K banks of memory, 4 Elliott 1,000 cps paper tape readers, 7 x 96K ch/sec Ampex tape decks and 2 1,000 lpm special Analex printers.
Feeding this machine was the largest data preparation shop in Europe with 240 Olivetti machines operating a single entry regime using check digit verification and check totalling to avoid the need to verify. It worked very well indeed.
The capacity of these machines was awe inspiring, for when properly programmed they were very fast indeed. I recall some benchmark work was done in the 70's with high end IBM 370 series mainframes failing to keep up with them.
Johnrwise (talk) 09:45, 20 August 2012 (UTC)
thread_title:  The mighty LEO 326 

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thread_title:  External links modified 

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