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In 1968 Shirley Chisholm became the first Black woman elected to the United States Congress. In 1972 she launched a campaign for the Democratic presidential nomination, breaking another political barrier.
MORE →Reflects the personal views, recollections, and perspective of the author, Mike Davis.
This is a personal recollection on the Move fire on May 13, 1985
DDT86.CMD in Digital Research CP/M-86 for the IBM Personal Computer Version 1.0Dynamic Debugging Technique (DDT) is a series of debugger programs originally developed for Digital Equipment Corporation (DEC) hardware, initially known as DEC Debugging Tape because it was distributed on paper tape. The name is a pun on the insecticide DDT, which "kills bugs".
The first version of DDT was developed at MIT for the PDP-1 computer in 1961. It was an adaptation of the early interactive, symbolic debugger FLIT (the "Flexowriter Interrogation Tape", itself a play on the name of a once-popular brand of insect spray[1][2]), developed for MIT's TX-0 computer in 1959.[3][4] Newer versions of DDT on newer platforms continued to use the acronym DDT, but the name "Dynamic Debugging Technique", introduced by 1965,[5] prevailed by the late 1960s.[6] Early versions of Digital Research's CP/M and CP/M-86 kept the name DDT (and DDT-86 and DDT-68K) for their debugger, reinterpreted as Dynamic Debugging Tool.[7][8] The CP/M DDT was later superseded by the Symbolic Instruction Debugger (SID,[9] ZSID, SID86,[10] and GEMSID) in DR DOS and GEM.[11][12]
In addition to its normal function as a debugger, DDT was also used as a top-level command shell for the Massachusetts Institute of Technology (MIT) Incompatible Timesharing System (ITS) operating system; on some more recent ITS systems, "PWORD"—which implements a restricted subset of DDT's functionality—is run first and is overlaid with DDT as soon as the user logs in. DDT could run and debug up to eight processes (called "jobs" on ITS) at a time, such as several sessions of TECO, and DDT could be run recursively - that is, some or all of those jobs could themselves be DDTs (which could then run another eight jobs, and so on). These eight jobs were all given unique names, and the usual name for the original and top-most DDT was "HACTRN" ("hack-tran"). Guy L. Steele wrote a filk poem parody of Edgar Allan Poe's "The Raven," entitled The HACTRN.[citation needed]
DDT (Dynamic Debugging Technique), as implemented on the DECsystem-10 & DECSYSTEM-20[13] allowed references to symbols within the programming being debugged. This feature loaded symbols from the .EXE executable file; a special version named SDDT used symbols from the running monitor and allowed system programmers to "peek" inside.[13]
Jack Dennis: But I spent a year or two with Tom Stockham, sharing an office with him in Building 26, and so we got together in a joint project, making an improved debugging facility for the TX-0. And together we came up with the name FLIT. And I don't know whether anybody around here is old enough—well, I'm sure John is laughs—to remember what Flit actually is. John A. McKensie: I'm wondering if there [indistinct] is still sold or not! Dennis: I don't think so, because I mentioned this acronym for the debugging tape, and no-one realises where the acronym actually came from. But there was a commercial for this stuff, since, in which ... the character says, 'Quick, Henry, the Flit!' Because there's a fly buzzing around, and it's supposed to be ... Flit is very powerful insecticide for getting rid of bugs. But in our uses it stood for 'Flexowriter Interrogation Tape', it uses this machine to find out what was going on in the bowels of a program.
Saunders: ... While this was going on, Jack Dennis wrote a debugging program which was an elaboration of one that had also come from Lincoln Labs. ... I thought it could be considerably improved and did so. ... This was the immediate ancestor of the similar program which ran on the PDP-1 when that showed up. We did the over-the-weekend adaptation of the macro assembler, not mine, but Jack's original, because there wasn't room for mine. The PDP-1 only had half as much memory as the TX-0 at the time. That was the ancestor of DDT, the DEC Debugging Tape, which did the same thing.
A utility program, Flexowriter Interrogation Tape (Flit), for use as an aid in on-line debugging, was written by Prof. Thomas G. Stockham and Jack B. Dennis in 1959. This was done as a voluntary contribution since neither was on the TX-0 staff.
{{cite journal}}: CS1 maint: periodical has ISBN (link) [1][2][link removed]. Originally presented at: Kildall, Gary Arlen (1977) [22–24 November 1976]. "A Simple Technique for Static Relocation of Absolute Machine Code". Written at Naval Postgraduate School, Monterey, California, USA. In Titus, Harold A. (ed.). Conference Record: Tenth Annual Asilomar Conference on Circuits, Systems and Computers: Papers Presented November 22–24, 1976. Asilomar Hotel and Conference Grounds, Pacific Grove, California, USA: Western Periodicals Company. pp. 420–424. ISSN 1058-6393. Retrieved 2021-12-06. (609 pages)
{{cite book}}: |work= ignored (help)
[…] Since the DR-DOS 7.03 DEBUG is still based on the old SID86.EXE, I suggest to run DEBUG 1.51 and enter the extended help system with ?? from the debug prompt. This will give you eight screens full of syntax and feature help. Some of these features were also supported by older issues. […]
{{cite newsgroup}}: CS1 maint: deprecated archival service (link)
DDT (Dynamic debugging technique) and TDT (Tracing debugging technique) for PDP-11 systems
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Source: Wikipedia. Article content is retrieved live through the MediaWiki API.
Dynamic Debugging Technique (DDT) is a series of debugger programs originally developed for Digital Equipment Corporation (DEC) hardware, initially known as DEC Debugging Tape because it was distributed on paper tape. The name is a pun on the insecticide DDT, which "kills bugs". The first version of DDT was developed at MIT for the PDP-1 computer in 1961. It was an adaptation of the early interactive, symbolic debugger FLIT (the "Flexowriter Interrogation Tape", itself a play on the name of a once-popular brand of insect spray), developed for MIT's TX-0 computer in 1959. Newer versions of DDT on newer platforms continued to use the acronym DDT, but the name "Dynamic Debugging Technique", introduced by 1965, prevailed by the late 1960s. Early versions of Digital Research's CP/M and CP/M-86 kept the name DDT (and DDT-86 and DDT-68K) for their debugger, reinterpreted as Dynamic Debugging Tool. The CP/M DDT was later superseded by the Symbolic Instruction Debugger (SID, ZSID, SID86, and GEMSID) in DR DOS and GEM. In addition to its normal function as a debugger, DDT was also used as a top-level command shell for the Massachusetts Institute of Technology (MIT) Incompatible Timesharing System (ITS) operating system; on some more recent ITS systems, "PWORD"—which implements a restricted subset of DDT's functionality—is run first and is overlaid with DDT as soon as the user logs in. DDT could run and debug up to eight processes (called "jobs" on ITS) at a time, such as several sessions of TECO, and DDT could be run recursively - that is, some or all of those jobs could themselves be DDTs (which could then run another eight jobs, and so on). These eight jobs were all given unique names, and the usual name for the original and top-most DDT was "HACTRN" ("hack-tran"). Guy L. Steele wrote a filk poem parody of Edgar Allan Poe's "The Raven," entitled The HACTRN.
Flit or FLIT may refer to: FliT (band), a Ukrainian-American punk rock band Flit (computer networking), a link-level atomic piece that forms a network packet or stream Flit (horse) (foaled 2016), an Australian thoroughbred racehorse Flit (insecticide), a brand of insecticide River Flit, in Bedfordshire, England Flit, a character in the 1966 film Il vostro super agente Flit Flit, a hummingbird in the 1995 film Pocahontas FLIT, a symbolic debugger which was the precursor of the "Dynamic Debugging Technique", DDT
In computing, binary translation is a form of binary recompilation in which sequences of instructions (machine code or bytecode) are translated from a source instruction set architecture (ISA) to a target instruction set with respect to the operating system for which the binary was compiled. In some cases, such as instruction set simulation, the target instruction set may be the same as the source instruction set, providing testing and debugging features such as instruction tracing, conditional breakpoints, and hot spot detection and optimization. The two main types are static and dynamic binary translation. Binary translation is commonly implemented in software using static or dynamic translation techniques.
Valgrind () is a programming tool for memory debugging, memory leak detection, and profiling. Valgrind was originally designed to be a freely licensed memory debugging tool for Linux on x86, but has since evolved to become a generic framework for creating dynamic analysis tools such as checkers and profilers.
Before the 1921 destruction of Tulsa’s Greenwood District, Black residents had created a remarkable center of business and community life. The district included stores, professional offices, entertainment venues and homes owned by Black citizens. Understanding Greenwood means learning what was built—not only what was burned.
MORE →Shirley Chisholm, elected in 1968.
