Protections indicate if the file may be seen by any other user, by other users with the same programmer number, if the file is read only or if it may be altered by another user, and whether the file may be executed by an ordimary user giving them additional privileges.
Certain other system files are kept in account [1,1]. The account [1,1] also had the special privilege of being the only account permitted to execute the POKE system call to put values into any memory in the system. One of the features of RSTS is the means for the execution of programs and the environment used to run them.
These environments were separate from each other such that one could start a program from one environment and switch to a different environment to run a different program. These environments were referred to as "Run-Time systems". One of the most powerful text editors ever developed, the TECO editor, was itself implemented as a run-time system due to the amount of memory it used, i.
If one wrote programs in a language that permitted true binary executables such as FORTRAN or the Macro Assembler or others that ran under the RT11 run-time system, the amount of memory available would be about 56Kbytes. Programs got around the limitations of the amount of available memory by using libraries when permissible , by complicated overlay strategies, or by calling other programs "Chaining" and passing them commands in a shared memory area called "Core Common," among other practices.
The cost of micro computers dropped so drastically, and their performance rose so radically, that minicomputers such as the PDP were no longer cost effective. Toolbox Special pages. A boost for computing came when President Kennedy decided that not only would America land a man on the moon before the end of the decade, but that it would also bring him back safely.
PDP-6 announced-the first commercial computer designed and used for timesharing. September-Porsche announce at Frankfurt Motor Show. Roger Deakin joins Digital in the UK. Summer-first internal attempt to put timesharing on a PDP was started. Over orders were taken in first week. Initial configuration included The decision to write a multi-user operating system had been taken several months earlier and Tom Barnett assigned as Product Manager.
However delays had been caused by internal feuding as to which language should be supported. The battle lines were drawn up behind two camps.
It was left to the marketing people to decide, since on a technical level these two languages were considered the same. Nobody thought that the limited character handling of FOCAL would represent any significant problems. Now there was a new problem. On Aug Digital sent out a two page invitation. A Digital employee would have handled the actual execution of a program, ie what happened after you typed RUN. The run only system was abandoned.
This was only short lived-since Honeywell already had a product with the same name. RSTS 11 Version 1 was never released. The first RSTS system was to have been made available for viewing at the Fall Joint Computer Conference but changes in design considerations prevented this debut. The system size grows-and now exceeds the target 16K word limit. There were no utilities. Seattle Pacific College is donated a system-Ken Olsen had been a student there.
Although a 16 user system, the computer manager only allowed one user to run at a time. He had thought it quite amazing that multiple keyboards could access the system-but, being an ex IBM man, it never occurred to him that they could do it at the same time. Each of the 18 schools were equipped with a baud modem and while the first 16 were logged in, the remaining two continued to dial in waiting for a free job slot.
Auto restart code was added by a young software services manager called Ted Sarbin. It had, until this moment, always been assumed that a combination of sequential ASCII files, plus Virtual Arrays would be sufficient for all disk handling.
Early pioneer? November-Nick Brackenbury joins Digital in U. At the end of a three hour session, David had written a slightly larger program to generate lots of Pythagorean triples. For his managerial peace of mind he checked that the program could be saved to DECtape and restored from a different handler at a different terminal into a different account. David came away impressed-and British Steel placed an order.
There are no known users. Under Version 3C, the monitor was unable to write to a disk file from a terminal while reading that file from another terminal. New devices included RK03 disks. Basic Plus now supports both 2 and 4 word maths package. There was a reference to a BADS file that might be used in future releases.
Hardware supported included both fixed disks ie K byte RF11s and removable disks 2. The garbage collector was not FIP overlaid and it swapped out the program and had to read it back in again. The command CAT almost stopped the system. PI was not write protected: i. The Job Max remained at 16 Jobs. The operating system file extension was changed from. A software support specialist from Manchester called John Gow came to the rescue.
Hooks were in the operating system for multiple Run Time Systems- but were not yet used. Swap Max was still 8K words for normal users but 16K for privileged users. Job Max was doubled to 32 Jobs. The maximum machine size was K words, of which K was usable. A total of over 25, PDPs had been shipped. This joint operation took two and a half days. There was a hidden option for overlapped seek with multiple disks. It was an extremely untidy release.
RSTS version 4B was released during the summer of The RP02 and the RP04 were added. Latest commit. Git stats 16 commits. Failed to load latest commit information.
Jul 2, Jul 27, Remove blank page from PDF scan. Jul 3, May 6, Initial commit. Jul 1, Nov 10, View code. I've patched the source-code for FIT to fix this.
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